Blue Light Glasses Break-Even Revenue: $668K Per Month

Fixed costs $11.1K/mo Core overhead

Contribution margin 79% After variable costs

Break-even revenue $66.8K/mo Monthly target

Break-even timing Month 14 Model turnpoint

Break-even calculator

Test how monthly revenue, direct costs, and fixed overhead interact to hit break-even for blue light filter glasses sales.

Lean Base Full

Monthly revenue Revenue sets the margin available to cover fixed costs. $ Low sales High sales Variable expenses These rise with each sale, like manufacturing, packaging, shipping, and fees. $ Low direct High direct

Money available to cover fixed costs $198,878 $245,250 revenue - $46,372 variable expenses

Margin ratio

81%

Covers fixed costs

Yes

Fixed monthly costs These are the monthly overhead costs break-even has to cover. $ Low overhead High overhead

Break-even chart Revenue Total costs

Which expenses are fixed and which move with sales in a blue light eyewear break-even model?

Cost classification

Your break-even math gets cleaner when inventory, shipping, ads, payroll, rent, and software sit in the right bucket. Misclassify one big line, and Month 14 break-even can look safer than it is.

Expense	Cost	Break-Even Treatment	Common Mistake
Frame and Lens Manufacturing	Variable	Apply as 10.5% of first-year revenue because it moves with product sales.	Treating the $100,000 initial inventory purchase as simple monthly overhead instead of inventory funding and cash timing.
Custom Packaging Materials	Variable	Apply as 2.5% of first-year revenue and scale it with shipped orders.	Forgetting packaging rises with each order, even when unit pricing improves later.
Fulfillment and Shipping Services	Variable	Apply as 5.0% of first-year revenue because shipping activity follows order volume.	Modeling shipping as flat monthly overhead and overstating margin at low volume.
E-commerce Transaction Fees	Variable	Apply as 3.0% of first-year revenue because fees track paid transactions.	Leaving payment fees out of contribution margin, which makes break-even too low.
Planned Paid Marketing	Semi-variable	Use the $150,000 first-year budget and test it against the $25 customer acquisition cost.	Treating all ad spend as fixed overhead or all as a per-order fee.
Payroll for Operating Team	Semi-fixed	Start with $350,000 per year, about $29,167 per month, then step up as FTE grows.	Scaling payroll smoothly with revenue instead of by hire timing and staffing levels.
Shared Office Space Lease	Fixed	Include $4,500 per month as stable overhead for the relevant planning range.	Spreading rent by order and missing the cash due each month.
Platform, Support Software, Hosting, Insurance, and Legal	Fixed	Include $6,600 per month combined as recurring operating overhead.	Putting recurring software and retainers into variable processing fees.

How does break-even change across lean, base, and full launch setups?

Scenario table

Lean mode trims fixed overhead, so break-even drops fast. Base sits near the line, and the fuller Year 2 setup needs more revenue but gives a wider cushion. No storefront rent is included here.

Planning numbers only; actual break-even will move with traffic, conversion, returns, and ad costs.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean ecommerce launch	$56K	$12K	$39K	79%	$5K	Lower overhead gives a clear cushion above break-even.
Base Year 1 launch	$56K	$12K	$44K	79%	$0K	Near break-even; small shifts in ad cost can flip profit.
Full Year 2 scale-up	$117K	$23K	$59K	80%	$34K	Year 2 volume covers the heavier fixed load with room to spare.

What breaks the break-even plan for blue light filter glasses?

Stress test

The base plan has only about a $5K cushion over break-even, so it is fragile. CAC above $25, shipping above 50%, transaction fees above 30%, or new hires before conversion proof can push it into loss fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$668K	$5K cushion	Barely above break-even at launch.
Revenue shortfall	Revenue slips 10% from the base plan.	$668K	$67K gap	A 10% sales miss creates about a $53K loss.
Fixed-cost increase	Fixed costs rise 10% to about $580K.	$735K	$62K gap	Extra rent or hires quickly eat the cushion.
Margin pressure	Variable expenses rise 5 points from shipping, fees, or supplier creep.	$713K	$40K gap	CAC above $25 or fees above 30% can do this.
Combined pressure	Revenue slips 10%, fixed costs rise 10%, and variable expenses rise 5 points.	$784K	$183K gap	At $601K revenue, the model is about $135K underwater.

What should you verify before committing to the first lease, inventory buy, and ad scale for blue light glasses?

Founder checklist

Don’t sign the lease, place the first big inventory order, or lift ad spend until the model holds the Year 1 CAC, margin, and cash path. The real test is whether demand can reach Month 14 breakeven without dropping below the $553K cash floor.

1CAC Test$25 CAC

Verify paid channels can stay at or below the Year 1 acquisition cost before you scale spend, because weak CAC breaks the path to breakeven.

2Margin Stack79% CM

Check supplier quotes, shipping, and fees against the Year 1 margin stack so the $85, $145, and $25 price points still cover fixed costs.

3Cash Floor$553K floor

Fund through the Month 13 minimum cash point so inventory, wages, and marketing do not force a stop before breakeven.

4Fixed Load$40.3K/mo

Know the monthly fixed burn before you lock in space or payroll, because the Year 1 base cost already runs about $40.3K a month before the content hire.

5Hire RampMonth 13

Delay the next hire until early demand is proven, since the content creator starts in Month 13 and should follow traction, not hope.

6Launch Prices$85 / $145 / $25

Test customer response to the core price ladder before you raise ad budgets, because pricing sets the revenue per order that funds growth.