Eyewear Manufacturing Break-Even Analysis: $109K Monthly Revenue

Fixed costs $75.2K Base monthly burn

Contribution margin 88.5% After variable costs

Break-even revenue $85.0K Monthly sales target

Break-even timing Month 1 Launch month

Break-even calculator

Use this to test monthly revenue, variable expenses, and fixed costs against break-even.

Lean Base Full

Monthly revenue Revenue sets the pool that covers variable costs and then fixed costs. $ Lower volume Higher volume Variable expenses These are direct costs that rise as sales and production rise. $ Tight costs Higher costs

Money available to cover fixed costs $201,629 $250,833 revenue - $49,204 variable expenses

Margin ratio

80%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly cost base contribution margin must cover. $ Lean overhead Scaled overhead

Break-even chart Revenue Total costs

Which eyewear manufacturing expenses are fixed, variable, or semi-fixed at break-even?

Cost classification

Your break-even math works only if unit-linked costs stay variable and rent or staffed capacity stay out of unit COGS. With Month 1 break-even, small classification errors can overstate margin before volume absorbs payroll and facility load.

Expense	Cost	Break-Even Treatment	Common Mistake
Frame materials	Variable	Apply per pair: $5.00 to $12.00 based on the product mix.	Averaging all frames into one rate and missing mix shifts.
Lens materials	Variable	Apply per pair: $4.00 to $9.00 before contribution margin.	Treating lens spend as factory overhead instead of unit COGS.
Direct labor assembly	Variable	Use $3.00 to $5.50 per pair in the unit margin formula.	Double counting it with salaried assembly technician payroll.
Sales commissions and e-commerce fees	Variable	Use 4.5% of first year revenue, then update by year.	Leaving selling fees below gross margin and overstating contribution.
D2C shipping and logistics	Variable	Use 3.0% of first year revenue as volume-linked fulfillment drag.	Calling shipping fixed because carrier bills arrive monthly.
Facility rent	Fixed	Include $15,000 per month in monthly break-even overhead.	Spreading rent per unit too early and hiding idle capacity.
Utilities	Semi-variable	Model the $2,500 monthly base plus the 0.5% revenue allocation.	Using only the base bill and missing production usage.
Assembly technician payroll	Semi-fixed	Step payroll from 2.0 FTE in the first year to 5.0 FTE by Year 4.	Modeling technicians as perfectly variable with every pair produced.

How does break-even change across lean, base, and full eyewear manufacturing scenarios?

Scenario table

Break-even stays positive in all three cases because revenue scales faster than fixed overhead once volume rises. Still, cash bottoms at $328,000 in Month 8, so early liquidity matters more than the Month 1 break-even label.

Planning assumptions only; actual results will move with mix, yield, and timing.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch case	$125.4k	$29.6k	$83.5k	76.4%	$12.3k	Covers fixed costs, but the cushion is thin.
Year 1 base case	$250.8k	$59.2k	$83.5k	76.4%	$108.1k	Clean first-year cushion for planning.
Full-capacity proxy	$788.8k	$170.1k	$97.5k	78.4%	$521.2k	Strong margin if staffing and capacity hold.

What happens if eyewear sales slow or costs rise before scale?

Stress test

At the base case, monthly revenue of about $250,800 covers $59,200 in variable costs and $83,500 in fixed costs, so break-even sits near $109,400. A 20% sales drop still leaves cushion, but margin and fixed-cost pressure cut into it fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$109,400	$141,400 cushion	Base case clears overhead by a wide margin.
Revenue shortfall	Revenue falls 20% to $200,700.	$109,400	$91,300 cushion	Still clears overhead, but the cushion shrinks.
Fixed-cost pressure	Fixed costs rise 15% to $96,100.	$125,800	$125,000 cushion	Higher overhead pushes break-even up, but the base case still covers it.
Margin pressure	Variable expenses rise 5 points to 28.6% of revenue.	$116,900	$133,900 cushion	Margin compression raises break-even and trims room.
Combined pressure	Revenue falls 20%, variable ratio rises 5 points, and fixed costs rise 15%.	$134,700	$66,000 cushion	This is the tightest case; it still earns, but the buffer is thin.

What should the founder verify before signing the lease, buying equipment, and hiring the first line?

Founder checklist

Verify demand, unit economics, and cash before you lock the facility or order the line. This plan only works if the plant can move at least 545 pairs a month at a $200.67 blended price and still carry the fixed-cost load.

1Launch demand545/mo

Confirm you can sell at least 545 pairs per month before the lease and equipment spend, because the first fixed-cost commitment only works with real order flow.

2Fixed load$22.7K/mo

Validate the monthly rent and overhead stack stays at $22.7K before payroll, so you know the cash floor the factory must clear every month.

3Unit margin76% CM

Check frame, lens, labor, packaging, freight, commissions, and shipping still leave about 76% contribution margin, or break-even moves out fast.

4Staffing ramp2 FTE

Test whether the Year 1 production crew, including 2 assembly technician FTEs, can support 15,000 pairs without shipment delays or overtime creep.

5Cash cushion$328K

Keep the reserve above the $328K cash low in Month 8, because accounting break-even in Month 1 does not protect operating cash.

6Capex timing$1.9M

Phase the $1.9M build-out, equipment, tooling, and quality spend across Months 1 to 10 so cash does not go out before the line is ready.