How Much to Charge for Knife Sharpening: Per Knife, Worked

October 27, 2026 · Pricing a service business

How much to charge for knife sharpening comes from what one knife costs you: your minutes at the hourly pay you set, plus belt, wheel and wrap wear. Divide that cost by one minus the margin you want and you have the price. In the illustrative example below, a knife costs $3.00, so a 40% margin needs $5.00 a knife, or $0.625 an inch on an 8-inch blade. Mower blades price the same way, at $9.00 in the example. Whether the business is profitable is a separate question, answered at the end with a year of markets and a restaurant route.

None of these figures are what knife sharpening costs in your area or what any shop charges. Every minute, abrasive price, fee and mileage belongs to one made-up part-time sharpener, there to be replaced with your own records.

The knife sharpening pricing formula

cost per knife   = minutes / 60 x your hourly pay
                   + belt price / knives per belt
                   + wheel price / knives per wheel + wrap
price per knife  = cost per knife / (1 - margin)
price per inch   = price per knife / blade length
market break-even = (stall + miles x cost per mile + hours x pay)
                    / (price - materials per knife)

Step 1: what one knife costs you

The example sharpener pays themselves $30.00 an hour and takes 5 minutes per knife, bench to wrapped.

Your time is 83.3% of the cost, so your minutes per knife move the price far more than abrasives do. Time yourself over a full batch before you trust any price.

Step 2: price per knife, or per inch

At a 40% margin the knife needs $5.00. The example charges a flat $6.00, which leaves $3.00 above cost, a 50% margin, so it clears the target.

Charging by length instead, $0.75 an inch gives the same $6.00 on the 8-inch example knife and $7.50 on a 10-inch blade, $1.50 more than the flat price. That only makes sense if longer blades really take you longer; your timing decides it.

Step 3: the market day, and the cost you must not count twice

A market day has costs that are there whether you sharpen one knife or a full table: the stall, the drive and every hour you are there. The example pays the sharpener’s $30.00 for all 6 market hours and 1 hour of travel.

47 knives break even, inside the 72 that 6 hours of nonstop sharpening could hold, and the example’s 55 knives leave $44.50 on top of the sharpener’s pay: $36.36 an hour for the day in all.

The non-obvious part is the $5.50 per knife. Because this sheet pays every market hour, sharpening or not, each knife counts only its $0.50 of materials, not the $3.00 full cost from step 1. Use the full cost here and you pay your sharpening minutes twice: the knife then brings in only $3.00, break-even jumps to 86 knives, more than the day can hold, and a day that pays looks like a loss. The rule is to pay each hour once, either per knife or per day, never both.

Step 4: house calls and the trip fee

A house call is the opposite case: the sharpening minutes are inside each knife’s cost, so only the trip is extra. A 20-mile round trip with 40 minutes of driving and 10 minutes of setup costs $37.00. At $3.00 profit a knife it takes 13 knives to cover it. The example call has 8, so a trip fee of $13.00 covers the rest, for a call total of $61.00.

Step 5: mower blades and scissors

The same cost-per-item rule prices mower blade sharpening and scissors. The fair comparison between them is what each earns per hour at the bench after materials.

Both add-on prices clear the margin. Per bench hour, scissors earn $67.00, knives $66.00 and mower blades $57.60, so in this example the mower blades are the slowest money on the bench. For mower blades, follow the mower manufacturer’s instructions for removal and refitting; this post gives no advice on either.

Step 6: a restaurant exchange route

The example also runs a weekly knife exchange: 6 restaurants with 10 knives each, 60 in kitchens, swapped for a sharp set every week. That takes 120 rotation knives, $3,600 bought up front and worn out over 120 weeks, $30.00 a week. Add route miles, route and sharpening hours at $30.00 and materials, and a week costs $324.00. A 25% margin needs $7.20 per knife per week, $72.00 per restaurant, and leaves $108.00 a week on top of pay for 8 hours.

Is a knife sharpening business profitable?

Profitable here means something left after paying yourself an hourly wage, not just money coming in. Over 48 market days and 48 route weeks in the example:

So yes, in this example: $6,720.00 on top of $30.00 an hour, which is $39.33 per hour worked before income tax, and $21,240.00 after a 25% set-aside. House calls, mower blades and scissors are not in that figure. Neither is equipment: in the pack, $1,000 of sharpener, jigs and stall gear is paid back from profit in month 2. Note that the $3,600 of rotation knives is cash out on day one, larger than the equipment, even though it is charged to the route only as weekly wear.

For knife sharpening business income on your own numbers, the test is the same: profit after your own hourly pay and fixed costs. If that line is negative, the business is paying you less than the rate you set.

How these were calculated

Cost per knife is minutes / 60 x hourly pay + belt price / knives per belt + wheel price / knives per wheel + wrap. Price at a margin is cost / (1 - margin). Market break-even is (stall + round-trip miles x cost per mile + market and travel hours x pay) / (price - materials), rounded up to whole knives. The trip fee is the trip cost less the knives’ profit, never below zero. The route week is stock / weeks of life + miles x cost per mile + route and sharpening hours x pay + materials. The year is market days x day profit + route weeks x week profit - fixed costs, plus pay for every hour. Figures are carried from step to step as the spreadsheet shows them, to the cent. Every figure was computed twice, once by the code behind the product below and once by an independent program that adds knives to a day one at a time and builds the route kitchen by kitchen, and the two agree. All inputs are illustrative, not measured times or market prices. None of this is financial, legal or tax advice.

The markup vs margin chart converts a margin to a markup, and the break-even analysis formula post covers the market-day sum in general.

To run this on your own minutes, markets and route, the pack below has eight linked calculators.