Flint Knapping Workshop Break-Even: $137K Monthly Revenue Target

Fixed costs $8.7K/mo Base overhead

Contribution margin 80.5% After variable costs

Break-even revenue $10.8K/mo Monthly target

Break-even timing Month 1 Launch month

Break-even calculator

Use this calculator to test whether monthly workshop revenue covers direct costs and fixed overhead.

Lean Base Full

Monthly revenue Higher revenue gives you more room to cover fixed costs and still stay profitable. $ Lower sales Higher sales Variable expenses These are the costs that rise as workshop activity grows, like materials, fees, and marketing. $ Lower direct costs Higher direct costs

Money available to cover fixed costs $110,642 $130,167 revenue - $19,525 variable expenses

Margin ratio

85%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly overhead your contribution margin has to cover. $ Lower overhead Higher overhead

Break-even chart Revenue Total costs

Which workshop expenses are fixed and which move with sales?

Cost classification

Break-even is reliable only when stable overhead, step-up staffing, and revenue-linked fees sit in the right buckets. Misclassify the $2,500 rent or 2.5% processing fee, and Month 1 break-even can look cleaner than cash reality.

Expense	Cost	Break-Even Treatment	Common Mistake
Workshop Studio Rent, $2,500 per month	Fixed	Include the full monthly rent in fixed overhead from Month 1.	Spreading rent per attendee and hiding the base commitment.
Utilities and Internet, $350 per month	Semi-variable	Keep the base charge in overhead, then allow usage to rise with more billable days.	Treating utilities as fully fixed as activity grows from 12 to 22 billable days.
Mobile Event Transport Costs, $500 per month	Semi-fixed	Model as a capacity step tied to off-site workshop volume and equipment use.	Linking every transport dollar to each booking instead of capacity jumps.
Director and Lead Instructor, $65,000 annual salary	Fixed	Use about $5,417 per month as fixed payroll coverage.	Treating lead instructor pay as variable per participant.
Workshop Assistant, 0.5 FTE in the first year	Semi-fixed	Add payroll in staffing steps as occupancy, class size, and billable days increase.	Forgetting that assistant hours rise before revenue feels constrained.
Raw Materials and Consumables	Variable	Apply the revenue percentage, starting at 6.0% in the first year.	Booking all stone and consumables as opening overhead.
Marketing and Customer Acquisition	Variable	Apply the revenue percentage, starting at 8.0% in the first year.	Assuming customer acquisition stays flat while bookings scale.
Booking and Payment Processing Fees	Variable	Apply 2.5% of revenue across the planning period.	Leaving payment fees below the break-even line.

How does break-even shift from a lean public workshop to the base plan and a fuller schedule?

Scenario table

The lean case misses fixed costs by a little, the base case covers them with a wide cushion, and the full case adds even more room. More billable days, higher occupancy, and extra staffing spread the fixed load across more revenue.

Planning cases only: these figures are model assumptions, not guarantees.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean public-workshop launch	$10,920	$2,129	$11,025	80.5%	-$2,234	Still short of fixed costs, so demand proof is needed.
Base Year 1 model	$37,700	$7,352	$11,025	80.5%	$19,323	Covers fixed costs with a solid cushion.
Full Year 2 capacity plan	$66,750	$11,681	$14,567	82.5%	$40,502	Strong absorption of fixed costs, with room to scale.

What breaks the break-even plan if bookings slip or costs rise?

Stress test

The base year clears break-even, but the cushion depends on steady occupancy and tight costs. A 20% booking drop, a $2,000 fixed-cost bump, or a 5-point margin slip still works, but the buffer drops fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$13,700	$19,300 cushion	Base year clears break-even with room.
Revenue shortfall	Monthly revenue falls 20% from the base plan.	$13,700	$13,300 cushion	A 20% booking drop still clears break-even, but the buffer shrinks.
Fixed-cost pressure	Fixed costs rise $2,000 per month from rent, insurance, or staffing creep.	$16,200	$17,300 cushion	Extra fixed spend eats the buffer fast.
Margin pressure	Variable expenses rise 5 points, cutting contribution margin to 75.5%.	$14,600	$17,400 cushion	Higher raw stone or fee costs trim each sale.
Combined pressure	Revenue falls 20%, variable expenses rise 5 points, and fixed costs rise $2,000.	$17,300	$9,700 cushion	If occupancy slips and mobile events add transport without enough private bookings, the plan gets tight.

What should you verify before you commit to the studio and equipment?

Founder checklist

Do not sign the studio lease or buy the trailer until pre-sold bookings can cover the $13,700 monthly break-even test. That means about 92 public-seat equivalents, 12 billable days in launch, and the current staffing plan all have to hold.

1Seat Demand$13.7K/mo

Pre-sell about 92 public-seat equivalents a month, or the mix that gets you there, before you sign the lease.

2Fixed Load$4.15K/mo

Verify rent, insurance, utilities, website, software, and transport stay near the modeled $4,150 monthly fixed base.

3Unit Margin80.5% CM

Keep contribution margin (CM, what’s left after variable costs) near 80.5% so raw materials, safety gear, marketing, and payment fees do not break the math.

4Billable Days12 days

Start with 12 billable days in launch and confirm bookings can fill that pace before you add more classes.

5Staff Ramp1.5 FTE

Hold at one director plus a 0.5 FTE assistant until occupancy rises from 45% toward the Year 2 plan of 55%.

6Cash Floor$892K

Fund the Month 1 cash floor and stage the $15,000 renovation, $4,500 tools, $8,000 booking build, and $12,000 mobile equipment in order.