Knife Sharpening Service Break-Even: $94K Monthly Revenue

Fixed costs $1.3K/mo Base overhead

Contribution margin 84.5% After variable costs

Break-even revenue $1.5K/mo Monthly target

Break-even timing Month 5 Model break-even

Break-even calculator

Test monthly revenue, variable expenses, and fixed costs against the monthly break-even point.

Lean Base Full

Monthly revenue Revenue sets the pool that covers direct costs and overhead. $ Low revenue High revenue Variable expenses These rise with each job, like consumables, fuel, and processing fees. $ Light costs Heavy costs

Money available to cover fixed costs $15,130 $17,030 revenue - $1,900 variable expenses

Margin ratio

89%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly overhead the margin has to cover. $ Low overhead High overhead

Break-even chart Revenue Total costs

Which knife sharpening service expenses are fixed, and which move with sales?

Cost classification

Break-even only works if fixed overhead stays separate from per-job spend. In the first year, fixed monthly overhead starts at $1,300 before payroll, while consumables, fuel, and card fees rise with visits and revenue.

Expense	Cost	Break-Even Treatment	Common Mistake
Vehicle Insurance	Fixed	Include $250 per month in fixed overhead; visits must cover it even in slow weeks.	Spreading it across jobs and understating the monthly nut.
Website & Software Subscriptions	Fixed	Include $150 per month as baseline overhead for booking, scheduling, and online presence.	Treating software as optional when it supports every booking.
Marketing & Advertising Base	Fixed	Include $300 per month before testing any growth spend tied to new visits.	Mixing base visibility spend with campaign spend.
Sharpening Consumables	Variable	Model as 4.0% of first-year revenue, improving to 3.0% by the mature year.	Treating abrasives and shop supplies as fixed.
Fuel & Vehicle Operations	Variable	Model as 6.0% of first-year revenue, falling to 4.0% as route density improves.	Treating fuel, travel, and vehicle usage as fixed.
Payment Processing Fees	Variable	Model as 2.5% of receipts; this moves directly with card-paid sales volume.	Leaving card fees out of contribution margin.
Extra Route Mileage	Semi-variable	Add above the normal route plan when jobs spread across wider service areas.	Averaging travel into base maintenance and missing margin leaks.
Added Technician Payroll	Semi-fixed	Add in steps: Technician 1 starts Month 13, Technician 2 Month 25, and Technician 3 scales in the fourth year.	Hiring before daily visit volume supports the payroll step.

How does break-even shift as this knife sharpening business moves from a lean launch to a base route and then a full commercial-heavy setup?

Scenario table

The lean launch breaks even on less revenue because overhead is lighter. The base and full routes need more monthly sales, but the higher visit value and stronger commercial mix give them a wider profit cushion.

Planning case only; actual break-even will move with route fill, pricing, fuel, and labor use.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean owner-led launch	$17,030	$2,638	$7,967	84.5%	$6,423	Above the $9,428 break-even level, but the cushion is thin.
Base route density plan	$41,934	$6,207	$11,300	85.2%	$24,427	Well above the $13,263 break-even level, so steady route fill matters.
Full commercial-heavy route	$189,875	$23,734	$19,217	87.5%	$146,924	Far above the $21,962 break-even level; utilization is the main watch item.

What breaks the break-even plan for a knife sharpening service?

Stress test

Year 1 starts with a $6.4k operating cushion, but it shrinks fast if repeat jobs slow or routes get longer. A 20% demand drop cuts the cushion to $3.5k, and higher variable costs or overhead can push break-even up quickly.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$9,426	$6,424 cushion	Baseline has room, but not much slack.
Revenue shortfall	Revenue falls 20% to $13,624.	$9,426	$3,545 cushion	Fewer repeat customers cut the buffer fast.
Fixed-cost increase	Fixed costs rise 15% to $9,162 a month.	$10,844	$5,228 cushion	Added overhead pushes the break-even line up.
Margin pressure	Variable expenses rise from 15.5% to 20.5% of revenue.	$10,021	$5,572 cushion	Longer routes, rework, or fees eat margin first.
Combined pressure	Revenue falls 20%, variable expenses rise to 20.5%, and fixed costs rise 15%.	$11,527	$1,669 cushion	Small demand slips plus cost creep almost erase the buffer.

Can this knife sharpening startup prove break-even before the second van and extra payroll?

Founder checklist

Do not commit to more vans or hires until you can prove monthly demand, the fixed cost load, and the cash cushion. In this model, the break-even test is about 144 visits a month, and the pressure rises fast once payroll starts.

1Demand Proof144 visits/mo

Verify you can book at least 144 visits a month before Month 13, because that is the cleanest test that the route can support Year 1 break-even.

2Fixed Load$7.97K/mo

Keep monthly fixed costs at or below $7,967 before more hiring or another van buy, since the business has to cover that load every month before profit shows up.

3Visit Value$65.50/visit

Check that the current mix really averages about $65.50 per stop from residential, repairs, retail, commercial, and expedited fees, because each visit must clear variable costs first.

4Staffing RampMonth 13

Prove commercial account demand before Month 13, because Technician 1 starts then and extra payroll only works if route density is already strong.

5Cash Cushion$815K min cash

Plan for the $815,000 minimum cash need in Month 10 and the 25-month payback, because the second van and fit-out hit before the model pays you back.

6Launch Flow$1.3K base

Verify booking, payment, consumables, van maintenance, storage, and route timing now, because a $1,300 base overhead only works if the day-to-day flow is tight from launch.