https://workednumbers.net/The arithmetic behind everyday money decisions, worked through with real numbers - and every figure checked by code before it is published.Fri, 23 Oct 2026 20:42:57 +0000https://workednumbers.net/3d-printing-pricing-calculator/https://workednumbers.net/3d-printing-pricing-calculator/Wed, 21 Oct 2026 12:00:00 +0000A 3D printing pricing calculator worked by hand, filament, machine hours, failed prints and your time. One example part prices at $54.71.https://workednumbers.net/bounce-house-rental-business-profit/https://workednumbers.net/bounce-house-rental-business-profit/Wed, 21 Oct 2026 12:00:00 +0000Bounce house rental business profit worked through: price per rental, unit payback, delivery fee, weekend capacity, break-even rentals and the season.https://workednumbers.net/drywall-estimate-calculator/https://workednumbers.net/drywall-estimate-calculator/Wed, 21 Oct 2026 12:00:00 +0000A drywall estimate worked line by line: surface minus openings, sheets with waste, mud and tape, labor by finish level, the bid. One room: $110.22 a sheet.https://workednumbers.net/flooring-cost-calculator/https://workednumbers.net/flooring-cost-calculator/Wed, 21 Oct 2026 12:00:00 +0000A flooring cost calculator for installers, worked line by line from room areas and whole boxes to labor per sq ft and a bid at $11.36 a sq ft.https://workednumbers.net/how-much-to-charge-for-alterations/https://workednumbers.net/how-much-to-charge-for-alterations/Wed, 21 Oct 2026 12:00:00 +0000How much to charge for sewing alterations, worked from your year and your clock. One example tailor needs $40.71 a paid hour and $25 for a hem.https://workednumbers.net/how-much-to-charge-for-bartending/https://workednumbers.net/how-much-to-charge-for-bartending/Wed, 21 Oct 2026 12:00:00 +0000How much to charge for bartending, worked from your own year. One example 150-guest wedding quotes $2,048.27 labor-only, a 40-guest party $977.99.https://workednumbers.net/how-much-to-charge-for-carpet-cleaning/https://workednumbers.net/how-much-to-charge-for-carpet-cleaning/Wed, 21 Oct 2026 12:00:00 +0000How much to charge for carpet cleaning per square foot, per room and per hour, from your own costs. One example: $0.27 a sq ft, $50.30 a room.https://workednumbers.net/how-much-to-charge-for-crochet-items/https://workednumbers.net/how-much-to-charge-for-crochet-items/Wed, 21 Oct 2026 12:00:00 +0000How much to charge for crochet items, from your own hours and yarn. One example: a scarf at $166.55, a baby blanket at $664.47, worked step by step.https://workednumbers.net/how-much-to-charge-for-embroidery/https://workednumbers.net/how-much-to-charge-for-embroidery/Wed, 21 Oct 2026 12:00:00 +0000How much to charge for embroidery per stitch, per logo and for digitizing, from your own costs. One example: $1.6827 per 1,000 stitches plus $2.90 a piece.https://workednumbers.net/how-much-to-charge-for-interior-design/https://workednumbers.net/how-much-to-charge-for-interior-design/Wed, 21 Oct 2026 12:00:00 +0000How much to charge for interior design services, from your own year and project hours. One example designer needs $83.33 a billable hour.https://workednumbers.net/how-much-to-charge-for-makeup/https://workednumbers.net/how-much-to-charge-for-makeup/Wed, 21 Oct 2026 12:00:00 +0000How much to charge for makeup, worked from your own year. One example prices an application from $52.76, a trial from $109.63, a lesson from $167.25.https://workednumbers.net/how-much-to-charge-for-pest-control/https://workednumbers.net/how-much-to-charge-for-pest-control/Wed, 21 Oct 2026 12:00:00 +0000How much to charge for pest control from your own costs: initial vs recurring plan, price by square footage, route density. Example: $153.42, then $64.10.https://workednumbers.net/how-much-to-charge-for-wedding-flowers/https://workednumbers.net/how-much-to-charge-for-wedding-flowers/Wed, 21 Oct 2026 12:00:00 +0000How much to charge for wedding flowers as a florist, from stem cost and design time. One example: a $211.53 bridal bouquet, a $4,477.74 wedding.https://workednumbers.net/laser-engraving-pricing-calculator/https://workednumbers.net/laser-engraving-pricing-calculator/Wed, 21 Oct 2026 12:00:00 +0000A laser engraving pricing calculator worked by hand, setup, blanks, laser minutes and your time. Example, 12 pieces at $11.06 each; one alone, $52.53.https://workednumbers.net/photo-booth-rental-business/https://workednumbers.net/photo-booth-rental-business/Wed, 21 Oct 2026 12:00:00 +0000A photo booth rental business plan worked through: startup cost ($6,000 in one example), package prices, and the 9 bookings a month it needs.https://workednumbers.net/screen-printing-pricing-calculator/https://workednumbers.net/screen-printing-pricing-calculator/Wed, 21 Oct 2026 12:00:00 +0000A screen printing pricing calculator worked from your own costs, and the pricing matrix it builds. One example: $20.20 a shirt at 12, $8.98 at 144.https://workednumbers.net/soap-making-cost-calculator/https://workednumbers.net/soap-making-cost-calculator/Wed, 21 Oct 2026 12:00:00 +0000A soap making cost calculator, worked by hand: ingredients, molds, packaging and your time per bar. One example batch costs $5.60 a bar.https://workednumbers.net/tile-installation-cost-per-square-foot/https://workednumbers.net/tile-installation-cost-per-square-foot/Wed, 21 Oct 2026 12:00:00 +0000Tile installation cost per square foot worked for the setter, from boxes and thinset to labor only at $37.39 and all in at $45.84 a sq ft.https://workednumbers.net/candle-pricing-calculator/https://workednumbers.net/candle-pricing-calculator/Mon, 19 Oct 2026 12:00:00 +0000How much does it cost to make a candle? In this worked example, $6.92 in materials and $12.80 with your time, priced to $19.69 wholesale and $29 retail.https://workednumbers.net/concrete-driveway-cost-calculator/https://workednumbers.net/concrete-driveway-cost-calculator/Mon, 19 Oct 2026 12:00:00 +0000A concrete driveway cost estimator worked line by line, from cubic yards and truck fees to a bid at your margin. One example bids $12.78 a sq ft.https://workednumbers.net/ebay-fee-calculator/https://workednumbers.net/ebay-fee-calculator/Mon, 19 Oct 2026 12:00:00 +0000eBay, Poshmark and Mercari fees from each platform's own page, worked to the cent. One $48 coat leaves $26.31, $28.15 or $24.15 profit.https://workednumbers.net/fence-estimate-calculator/https://workednumbers.net/fence-estimate-calculator/Mon, 19 Oct 2026 12:00:00 +0000How to bid a fence job from your own costs, and what fence cost per linear foot that bid implies. Worked example: a $8,520 bid, $37.67 a foot.https://workednumbers.net/freelance-writing-rates-per-word/https://workednumbers.net/freelance-writing-rates-per-word/Mon, 19 Oct 2026 12:00:00 +0000A per-word rate = your hourly floor / words you finish per hour of ALL the work. Worked: $62.50 an hour becomes $0.3125 a word, not $0.125.https://workednumbers.net/handyman-rates/https://workednumbers.net/handyman-rates/Mon, 19 Oct 2026 12:00:00 +0000Set handyman rates from your own year: hourly floor, trip charge, minimum and quotes. Worked example: $50.00 a billed hour, $110 minimum.https://workednumbers.net/how-much-life-insurance-do-i-need-calculator/https://workednumbers.net/how-much-life-insurance-do-i-need-calculator/Mon, 19 Oct 2026 12:00:00 +0000How much life insurance you need, worked two ways: the DIME method ($1,075,000 in the example) and needs minus what you have ($1,022,059).https://workednumbers.net/how-much-to-charge-as-a-dj/https://workednumbers.net/how-much-to-charge-as-a-dj/Mon, 19 Oct 2026 12:00:00 +0000How much to charge as a DJ, worked from every hour a booking takes. One example 5-hour wedding prices at $1,025, a 4-hour party at $800.https://workednumbers.net/how-much-to-charge-as-a-personal-chef/https://workednumbers.net/how-much-to-charge-as-a-personal-chef/Mon, 19 Oct 2026 12:00:00 +0000Personal chef prices worked from the year you want to keep. One example chef needs $90 a cooking hour, $470 a meal-prep visit and $135 a dinner guest.https://workednumbers.net/how-much-to-charge-as-a-virtual-assistant/https://workednumbers.net/how-much-to-charge-as-a-virtual-assistant/Mon, 19 Oct 2026 12:00:00 +0000Virtual assistant rates worked from your own year: a $48.00 hourly floor, a $988.00 retainer package, and what rollover hours do to it.https://workednumbers.net/how-much-to-charge-for-a-logo/https://workednumbers.net/how-much-to-charge-for-a-logo/Mon, 19 Oct 2026 12:00:00 +0000Price a logo as phase hours x your floor rate, plus expenses. A worked example: $85 an hour, 25.3 hours, a $2,250 quote, and what revisions do to it.https://workednumbers.net/how-much-to-charge-for-bookkeeping/https://workednumbers.net/how-much-to-charge-for-bookkeeping/Mon, 19 Oct 2026 12:00:00 +0000Bookkeeping pricing from your own numbers: an hourly floor of $83.05, a monthly retainer of $800 from transactions, and a fixed fee for catch-up work.https://workednumbers.net/how-much-to-charge-for-car-detailing/https://workednumbers.net/how-much-to-charge-for-car-detailing/Mon, 19 Oct 2026 12:00:00 +0000How much to charge for car detailing and mobile detailing, from your income, products and drive. One example sedan prices at $175.https://workednumbers.net/how-much-to-charge-for-christmas-light-installation/https://workednumbers.net/how-much-to-charge-for-christmas-light-installation/Mon, 19 Oct 2026 12:00:00 +0000Christmas light installation prices worked from your crew, gear and lights. One example house prices at $689.45, $3.21 a foot, with a $213.79 takedown.https://workednumbers.net/how-much-to-charge-for-dog-grooming/https://workednumbers.net/how-much-to-charge-for-dog-grooming/Mon, 19 Oct 2026 12:00:00 +0000Set dog grooming prices from your own year: an hourly floor, then size, coat, add-ons and mobile. Worked example: $43.86 an hour, $78.56 a large dog.https://workednumbers.net/how-much-to-charge-for-gutter-cleaning/https://workednumbers.net/how-much-to-charge-for-gutter-cleaning/Mon, 19 Oct 2026 12:00:00 +0000How much to charge for gutter cleaning per linear foot, worked from your own year. One example business needs $0.40 a foot one-story, $0.60 on two.https://workednumbers.net/how-much-to-charge-for-lash-extensions/https://workednumbers.net/how-much-to-charge-for-lash-extensions/Mon, 19 Oct 2026 12:00:00 +0000How much to charge for lash extensions, worked from your year, product and minutes. One example artist needs $129.91 for a hybrid set, $65.19 a fill.https://workednumbers.net/how-much-to-charge-for-massage/https://workednumbers.net/how-much-to-charge-for-massage/Mon, 19 Oct 2026 12:00:00 +0000Massage therapist pricing from your own year and your weekly hands-on hours. Worked example: $78.09 an hour, $80.59 for 60 minutes, $166.78 an outcall.https://workednumbers.net/how-much-to-charge-for-nails/https://workednumbers.net/how-much-to-charge-for-nails/Mon, 19 Oct 2026 12:00:00 +0000How much to charge for nails, worked from your income, costs and minutes. One example tech needs $43.13 a paid hour and $71.54 for a full set.https://workednumbers.net/how-much-to-charge-for-tree-removal/https://workednumbers.net/how-much-to-charge-for-tree-removal/Mon, 19 Oct 2026 12:00:00 +0000How much to charge for tree removal, worked from crew time, equipment and a target margin. One example crew hour costs $119.25 and prices at $183.46.https://workednumbers.net/how-much-to-charge-for-tutoring/https://workednumbers.net/how-much-to-charge-for-tutoring/Mon, 19 Oct 2026 12:00:00 +0000Set tutoring rates per hour from your own year: income, costs, prep and cancellations. Worked example: a $62.10 floor, and why a 10% package costs you money.https://workednumbers.net/how-much-to-charge-to-paint-a-room/https://workednumbers.net/how-much-to-charge-to-paint-a-room/Mon, 19 Oct 2026 12:00:00 +0000A painting estimate worked from wall area, your own speed and a target margin. One example bedroom prices at $940; a house bids at $6,810.https://workednumbers.net/how-to-price-baked-goods/https://workednumbers.net/how-to-price-baked-goods/Mon, 19 Oct 2026 12:00:00 +0000How much to charge for a cake: ingredients, your hours, fixed costs and a markup. A worked example from $13.01 of ingredients to a $112 cake.https://workednumbers.net/kitchen-remodel-cost-calculator/https://workednumbers.net/kitchen-remodel-cost-calculator/Mon, 19 Oct 2026 12:00:00 +0000Work out a kitchen remodel cost or bathroom remodel budget from your own quotes, line by line, with a reserve. Example kitchen: $45,183.50.https://workednumbers.net/moving-company-prices/https://workednumbers.net/moving-company-prices/Mon, 19 Oct 2026 12:00:00 +0000Moving company prices per hour worked from your truck, crew wages and overhead, plus travel, stairs, packing and flat rates. Example crew bills $165.00.https://workednumbers.net/pension-lump-sum-vs-annuity-calculator/https://workednumbers.net/pension-lump-sum-vs-annuity-calculator/Mon, 19 Oct 2026 12:00:00 +0000Should you take the pension lump sum? Work out the return the annuity pays and the break-even age. Example: $2,400 a month or $400,000.https://workednumbers.net/quarterly-estimated-tax-calculator/https://workednumbers.net/quarterly-estimated-tax-calculator/Mon, 19 Oct 2026 12:00:00 +00002026 self-employment tax on $85,000 of profit is $12,010.12. Add income tax at your own rate and divide by four. Worked example, with the set-aside.https://workednumbers.net/roofing-estimate-calculator/https://workednumbers.net/roofing-estimate-calculator/Mon, 19 Oct 2026 12:00:00 +0000A roofing estimate worked line by line: roof squares from footprint and pitch, materials, tear-off, labor and margin. One example roof bids at $656.23 a square.https://workednumbers.net/snow-plowing-prices/https://workednumbers.net/snow-plowing-prices/Mon, 19 Oct 2026 12:00:00 +0000Snow plowing prices worked from your truck, plow, fuel and insurance, per push and as a seasonal contract. One example truck needs $110.31 an hour.https://workednumbers.net/social-security-break-even-calculator/https://workednumbers.net/social-security-break-even-calculator/Mon, 19 Oct 2026 12:00:00 +0000When to take Social Security, worked out. On a $2,000 benefit, 62 pays $1,400, 70 pays $2,480, and waiting catches up at age 80.4.https://workednumbers.net/compound-interest-calculator-monthly-contributions/https://workednumbers.net/compound-interest-calculator-monthly-contributions/Sat, 17 Oct 2026 12:00:00 +0000Compound interest with monthly contributions, worked: $10,000 plus $300 a month at an example 6% for 20 years ends at $171,714.31. Formula and withdrawals.https://workednumbers.net/heloc-payment-calculator/https://workednumbers.net/heloc-payment-calculator/Sat, 17 Oct 2026 12:00:00 +0000HELOC payment, worked: $50,000 at an illustrative 8.5% is $354.17 a month interest-only, then $433.91 when repayment starts. Formulas and extra payments.https://workednumbers.net/house-flipping-calculator/https://workednumbers.net/house-flipping-calculator/Sat, 17 Oct 2026 12:00:00 +0000The 70% rule sets a flip's offer, not its profit. Worked: the rule leaves $90,000, costs take $47,400, profit is $42,600. BRRRR too.https://workednumbers.net/how-much-to-charge-for-home-daycare/https://workednumbers.net/how-much-to-charge-for-home-daycare/Sat, 17 Oct 2026 12:00:00 +0000Work out how much to charge for home daycare from your income, costs and licensed capacity. Worked example: $223.11 a week, $966.81 a month.https://workednumbers.net/lawn-mowing-pricing-calculator/https://workednumbers.net/lawn-mowing-pricing-calculator/Sat, 17 Oct 2026 12:00:00 +0000How much to charge for lawn mowing, worked from your income, costs, mowing speed and drive time. One example lawn prices at $33 a cut.https://workednumbers.net/mileage-reimbursement-calculator-2026/https://workednumbers.net/mileage-reimbursement-calculator-2026/Sat, 17 Oct 2026 12:00:00 +0000The 2026 IRS mileage rate changed midyear: 72.5 cents before July 1, 76 cents after. Split your miles at June 30, then check the rate against your car.https://workednumbers.net/pet-sitting-rates/https://workednumbers.net/pet-sitting-rates/Sat, 17 Oct 2026 12:00:00 +0000Set pet sitting rates per hour, visit, day and night from your own hours, drive time and costs. Worked example: $43.75 an hour, $40.16 a visit.https://workednumbers.net/roth-vs-traditional-401k-calculator/https://workednumbers.net/roth-vs-traditional-401k-calculator/Sat, 17 Oct 2026 12:00:00 +0000Roth vs traditional 401(k) comes down to two tax rates: yours today and yours in retirement. Worked with a match, which lands pre-tax either way.https://workednumbers.net/solar-panel-payback-calculator/https://workednumbers.net/solar-panel-payback-calculator/Sat, 17 Oct 2026 12:00:00 +0000Solar payback = net cost / yearly savings. Worked: 17.5 years flat, 14.7 with rising rates. Export credit and loan effects shown.https://workednumbers.net/vending-machine-profit-calculator/https://workednumbers.net/vending-machine-profit-calculator/Sat, 17 Oct 2026 12:00:00 +0000Work out what a vending machine makes a month from price, fees, location commission and route time. One machine, worked: $208.13 a month.https://workednumbers.net/50-30-20-budget-calculator/https://workednumbers.net/50-30-20-budget-calculator/Fri, 16 Oct 2026 12:00:00 +0000The 50/30/20 budget rule as a calculator. Take-home pay of $4,800 splits into $2,400, $1,440 and $960, plus what biweekly pay changes.https://workednumbers.net/break-even-roas/https://workednumbers.net/break-even-roas/Fri, 16 Oct 2026 12:00:00 +0000Break even ROAS = 1 / contribution margin. On one illustrative order that is 1.92, so a reported ROAS of 1.6 loses $5.51 an order. Formula and worked example.https://workednumbers.net/car-affordability-calculator/https://workednumbers.net/car-affordability-calculator/Fri, 16 Oct 2026 12:00:00 +0000How much car you can afford on your income, worked backward from the payment formula - and why budgeting the payment alone overshoots by $18,803.https://workednumbers.net/coast-fire-calculator/https://workednumbers.net/coast-fire-calculator/Fri, 16 Oct 2026 12:00:00 +0000Coast FIRE is your FIRE number discounted at the real return. The formula, a worked example ($462,932 today), and the inflation mistake that halves it.https://workednumbers.net/daycare-vs-nanny-cost/https://workednumbers.net/daycare-vs-nanny-cost/Fri, 16 Oct 2026 12:00:00 +0000Daycare is billed per child, a nanny per household - plus employer payroll tax. Worked example of daycare vs nanny cost a year and a month.https://workednumbers.net/how-much-to-charge-for-ugc/https://workednumbers.net/how-much-to-charge-for-ugc/Fri, 16 Oct 2026 12:00:00 +0000Price a UGC video from your own hours and costs, then add usage rights as a multiplier. Worked example: a $445.00 floor, $975.00 with add-ons.https://workednumbers.net/how-to-calculate-wholesale-price/https://workednumbers.net/how-to-calculate-wholesale-price/Fri, 16 Oct 2026 12:00:00 +0000Wholesale price = unit cost / (1 - target margin). A worked example from a $6.40 materials cost to a $29.00 wholesale and $58.00 retail price.https://workednumbers.net/net-worth-calculator/https://workednumbers.net/net-worth-calculator/Fri, 16 Oct 2026 12:00:00 +0000How to calculate net worth, step by step, including a mortgage. A worked example where $558,000 owned minus $303,200 owed leaves $254,800.https://workednumbers.net/refinance-break-even-calculator/https://workednumbers.net/refinance-break-even-calculator/Fri, 16 Oct 2026 12:00:00 +0000Refinance break even point = closing costs / monthly saving. On one illustrative loan that is 18.7 months, but the balance says month 25. Worked.https://workednumbers.net/w2-to-1099-rate-calculator/https://workednumbers.net/w2-to-1099-rate-calculator/Fri, 16 Oct 2026 12:00:00 +0000A 1099 rate that matches a W-2 salary = (salary + benefits + employer tax + costs) / billable hours. Worked: $85,000 becomes $76.60 an hour.https://workednumbers.net/amazon-fba-fees/https://workednumbers.net/amazon-fba-fees/Wed, 14 Oct 2026 12:00:00 +0000Amazon FBA fees for 2026, worked to the cent: a $24.99 unit keeps $10.39, not $18.99. The fee chart, the formula, and the $10 price-band cliff.https://workednumbers.net/aquarium-volume-calculator/https://workednumbers.net/aquarium-volume-calculator/Wed, 14 Oct 2026 12:00:00 +0000Gallons = length x width x water depth in inches / 231. A worked example where a tank sold as 75 gallons holds 58.9 gallons of real water.https://workednumbers.net/booth-rent-vs-commission/https://workednumbers.net/booth-rent-vs-commission/Wed, 14 Oct 2026 12:00:00 +0000Booth rent beats commission once weekly takings pass (rent + costs) / (1 - fees - your split). Worked example: $892.86 a week, or 41% of the chair booked.https://workednumbers.net/break-even-analysis-formula/https://workednumbers.net/break-even-analysis-formula/Wed, 14 Oct 2026 12:00:00 +0000Break-even point = fixed costs / (price - variable cost). Worked example, break even analysis tables, and why a 10% discount needs 33.3% more sales.https://workednumbers.net/cake-pan-size-conversion/https://workednumbers.net/cake-pan-size-conversion/Wed, 14 Oct 2026 12:00:00 +0000To convert a recipe between cake pans, scale by area. A 9x13 to 8x8 is x0.55. Pan size conversion chart, the formula, and what changes bake time.https://workednumbers.net/capitalized-interest-student-loans/https://workednumbers.net/capitalized-interest-student-loans/Wed, 14 Oct 2026 12:00:00 +0000Capitalized interest means unpaid interest is added to your student loan balance. A 12-month pause on $38,000 at 6.8% costs $4,733.93. The math.https://workednumbers.net/cash-flow-forecast/https://workednumbers.net/cash-flow-forecast/Wed, 14 Oct 2026 12:00:00 +0000A business growing 20% a month books $118,742 of profit and still runs out of cash in month 10. How to do a cash flow forecast, with an Excel layout.https://workednumbers.net/how-many-words-per-page/https://workednumbers.net/how-many-words-per-page/Wed, 14 Oct 2026 12:00:00 +0000Words per page depends on trim, font, leading and margins. Two measured books ran 206-226. How to measure yours and turn word count into page count.https://workednumbers.net/how-much-to-charge-for-a-website/https://workednumbers.net/how-much-to-charge-for-a-website/Wed, 14 Oct 2026 12:00:00 +0000Price a website as hours x your floor rate, with revision rounds counted. A $4,000 build at 40 hours drops to $76.92 an hour by round two.https://workednumbers.net/how-much-to-charge-for-photography/https://workednumbers.net/how-much-to-charge-for-photography/Wed, 14 Oct 2026 12:00:00 +0000Price only the shooting hours and a 10-hour wedding comes to $946.90. Count editing, travel and admin and it is $4,450.43. The formula, worked.https://workednumbers.net/how-much-to-charge-for-video-editing/https://workednumbers.net/how-much-to-charge-for-video-editing/Wed, 14 Oct 2026 12:00:00 +0000A per-minute rate set on a 30-minute edit quotes $39.88 for a 2-minute job that costs $162.45. How to price video editing from your hours and the footage.https://workednumbers.net/how-much-to-charge-for-window-cleaning/https://workednumbers.net/how-much-to-charge-for-window-cleaning/Wed, 14 Oct 2026 12:00:00 +0000Window cleaning prices per pane, worked from your own costs. In one example the pane price you need runs from $1.25 to $2.81 - set by the drive.https://workednumbers.net/hvac-flat-rate-pricing/https://workednumbers.net/hvac-flat-rate-pricing/Wed, 14 Oct 2026 12:00:00 +0000HVAC flat rate pricing from your own costs: labor, a callback reserve, marked-up parts, then margin. Worked example: 1.75 hours prices at $736.08.https://workednumbers.net/junk-removal-pricing/https://workednumbers.net/junk-removal-pricing/Wed, 14 Oct 2026 12:00:00 +0000Junk removal pricing from your own costs. One $500 full load nets $357.12 on furniture and loses $571.00 on concrete. The formula, worked.https://workednumbers.net/kdp-royalty-calculator/https://workednumbers.net/kdp-royalty-calculator/Wed, 14 Oct 2026 12:00:00 +0000KDP royalty worked to the cent: a 200-page paperback earns $1.59 at $9.98 and $2.59 at $9.99. Print cost, minimum price, 35% vs 70%.https://workednumbers.net/net-30-vs-net-60/https://workednumbers.net/net-30-vs-net-60/Wed, 14 Oct 2026 12:00:00 +0000Net 60 on an $8,000 invoice costs $157.81 to wait for. A 2/10 net 30 discount costs 37.2% a year. Net 30 meaning and the math, worked.https://workednumbers.net/printable-ring-sizer/https://workednumbers.net/printable-ring-sizer/Wed, 14 Oct 2026 12:00:00 +0000Ring size chart in mm, three ways to measure ring size at home, and why a printable ring sizer printed at 97% reads a size 7 as 7.66.https://workednumbers.net/race-time-predictor/https://workednumbers.net/race-time-predictor/Wed, 14 Oct 2026 12:00:00 +0000A 25:00 5K predicts a 3:59:47 marathon, not 3:30:59. Riegel's race time predictor formula, a 5K-to-marathon chart and a pace chart.https://workednumbers.net/real-estate-commission-split/https://workednumbers.net/real-estate-commission-split/Wed, 14 Oct 2026 12:00:00 +0000On an 80/20 split, a $9,625 commission keeps $7,700. After a $16,000 cap, the same deal keeps $9,625. The split and cap formula, worked deal by deal.https://workednumbers.net/rent-vs-buy-calculator/https://workednumbers.net/rent-vs-buy-calculator/Wed, 14 Oct 2026 12:00:00 +0000Is it better to rent or buy? On one illustrative house the rent vs buy break even is 16 years at flat prices and 6 at +3% a year. The formula, worked.https://workednumbers.net/reorder-point-formula/https://workednumbers.net/reorder-point-formula/Wed, 14 Oct 2026 12:00:00 +0000Reorder point = daily demand x lead time + safety stock. Worked example with safety stock and EOQ, where ordering 86 at a time costs $2,222 a year vs $1,039.https://workednumbers.net/sinking-funds/https://workednumbers.net/sinking-funds/Wed, 14 Oct 2026 12:00:00 +0000A sinking fund turns a known future bill into a monthly amount. The formula, a $7,140 example that becomes $595 a month, and how to catch up late.https://workednumbers.net/social-media-manager-pricing/https://workednumbers.net/social-media-manager-pricing/Wed, 14 Oct 2026 12:00:00 +0000Ten posts a month is 14.5 hours as static graphics and 40.5 as reels. How much to charge for social media management, worked from hours.https://workednumbers.net/trucking-cost-per-mile/https://workednumbers.net/trucking-cost-per-mile/Wed, 14 Oct 2026 12:00:00 +0000Trucking cost per mile, worked out: $1.23 a mile all-in in one example, but $1.64 per LOADED mile at 25% deadhead. The formula and a load test.https://workednumbers.net/used-car-inspection-checklist/https://workednumbers.net/used-car-inspection-checklist/Wed, 14 Oct 2026 12:00:00 +0000A used car inspection checklist of 42 checks in walkaround order - VIN and recalls first, engine cold, test drive, paperwork, then a mechanic.https://workednumbers.net/wedding-budget-breakdown/https://workednumbers.net/wedding-budget-breakdown/Wed, 14 Oct 2026 12:00:00 +0000An illustrative $28,950 wedding averages $241.25 a guest, but one more guest costs $144. The fixed vs per-guest breakdown, worked.https://workednumbers.net/100-envelope-challenge-total/https://workednumbers.net/100-envelope-challenge-total/Tue, 13 Oct 2026 12:00:00 +0000The 100 envelope challenge totals $5,050. What that means week by week, the worst week you can draw, and gentler versions if it's too much.https://workednumbers.net/debt-snowball-vs-avalanche-cost/https://workednumbers.net/debt-snowball-vs-avalanche-cost/Tue, 13 Oct 2026 12:00:00 +0000Avalanche is mathematically optimal - but by how much? Two worked examples: one where snowball costs $104.43, one where it costs $1,450.67.https://workednumbers.net/etsy-fee-calculator/https://workednumbers.net/etsy-fee-calculator/Tue, 13 Oct 2026 12:00:00 +0000Etsy fees for US sellers, worked to the cent: 18.5% of a $5.00 sale, 10.1% of a $75.00 one. The formula, the curve, and digital products.https://workednumbers.net/extra-mortgage-payment-calculator/https://workednumbers.net/extra-mortgage-payment-calculator/Tue, 13 Oct 2026 12:00:00 +0000The same $10,000 extra mortgage payment saves $53,943.23 in month 1 and $3,613.95 in month 300. Worked amortization math and the formula.https://workednumbers.net/freelance-hourly-rate-calculator/https://workednumbers.net/freelance-hourly-rate-calculator/Tue, 13 Oct 2026 12:00:00 +0000Income divided by 2,080 hours gives $28.85 an hour. The rate that actually covers the year is $84.98. The freelance rate formula, worked step by step.https://workednumbers.net/how-much-to-charge-for-pressure-washing/https://workednumbers.net/how-much-to-charge-for-pressure-washing/Tue, 13 Oct 2026 12:00:00 +0000Pressure washing price per square foot from your own costs. In one worked example a driveway needs $0.106/sq ft and a roof $0.228.https://workednumbers.net/how-to-price-house-cleaning-jobs/https://workednumbers.net/how-to-price-house-cleaning-jobs/Tue, 13 Oct 2026 12:00:00 +0000Price each cleaning job from your hours, drive time, supplies and margin. Worked example - a 2.5-hour regular clean comes to $170, not $119.91.https://workednumbers.net/markup-vs-margin-chart/https://workednumbers.net/markup-vs-margin-chart/Tue, 13 Oct 2026 12:00:00 +0000A 50% markup is a 33.3% margin. Conversion charts both ways, the two formulas, and a worked example of the pricing mistake they cause.https://workednumbers.net/menu-pricing-formula-food-cost-percentage/https://workednumbers.net/menu-pricing-formula-food-cost-percentage/Tue, 13 Oct 2026 12:00:00 +0000Menu price = plate cost / target food cost %. But cost the plate on raw weight and a 30% target quietly runs at 50.6%. Worked example inside.https://workednumbers.net/rental-property-cash-flow-calculator/https://workednumbers.net/rental-property-cash-flow-calculator/Tue, 13 Oct 2026 12:00:00 +0000The same $250,000 rental shows $9,481 a year of cash flow, or $781 once vacancy, repairs and capex are counted. The formula and a spreadsheet layout.https://workednumbers.net/when-to-start-seeds-indoors-by-zone/https://workednumbers.net/when-to-start-seeds-indoors-by-zone/Tue, 13 Oct 2026 12:00:00 +0000Start tomatoes 52 days before your last frost, peppers 66. Seed starting charts for zones 4-9, and why your zone is not your frost date.