Storm Glass Break-Even Analysis: $32K Monthly Revenue Needed

Fixed costs $18.9K/mo Overhead floor

Contribution margin 54.7% After variable costs

Break-even revenue $34.6K/mo Cover the base

Break-even timing Month 14 Launch ramp point

Break-even calculator

Test how monthly revenue, variable expenses, and fixed monthly costs shape break-even for a decorative storm glass retailer.

Lean Base Full

Monthly revenue Revenue sets the cash left after direct costs to cover fixed overhead. $ Low sales Peak sales Variable expenses These are the costs that rise with each sale, like sourcing, packaging, fees, and handling. $ Light costs Heavy costs

Money available to cover fixed costs $42,465 $52,500 revenue - $10,035 variable expenses

Margin ratio

81%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly cost base revenue must cover before profit starts. $ Lean overhead Higher overhead

Break-even chart Revenue Total costs

Which storm glass expenses are fixed, and which move with sales?

Cost classification

Break-even gets more reliable when order-level costs move with revenue and overhead stays fixed. Here’s the clean split before committing to inventory, rent, software, payroll, or paid ads.

Expense	Cost	Break-Even Treatment	Common Mistake
Artisanal Glass Sourcing and Manufacturing	Variable	Model as 12.0% of first-year revenue, falling to 10.0% in the mature year.	Treating sourcing like fixed overhead instead of a direct sales load.
Eco Friendly Protective Packaging	Variable	Apply 3.0% of first-year revenue, improving to 2.2% as volume scales.	Forgetting that every shipped order needs protective materials.
E-commerce Platform and Payment Fees	Variable	Use 3.5% of first-year revenue, stepping down to 3.1% in the mature year.	Modeling payment fees as flat software spend.
3PL Logistics and Handling Fees	Variable	Use 1.5% of first-year revenue, improving to 1.1% with scale.	Leaving fulfillment out of contribution margin.
Annual Marketing Budget	Semi-variable	Start with $60,000 in the first year and test against $15 customer acquisition cost.	Treating paid ads like payment fees that rise perfectly with each sale.
Small Studio Rent	Fixed	Carry $2,500 per month through the planning range.	Spreading rent per unit and hiding the monthly cash floor.
E-commerce Subscription	Fixed	Carry $2,000 per month as baseline operating overhead.	Mixing subscription overhead with percentage-based checkout fees.
Utilities and High Speed Internet	Semi-fixed	Use $450 per month until studio capacity or usage changes enough to reset the run rate.	Assuming utilities scale neatly with every order.

How does break-even shift from lean launch to full-scale storm glass sales?

Scenario table

The launch case is tight, the middle case clears break-even, and the full case builds a much wider cushion. Here’s the quick math: revenue rises faster than the fixed burden, and the contribution margin stays above 80% in every case.

Planning assumptions only; actual results can move with product mix, pricing, and ad efficiency.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch case	$27,000	$5,400	$25,800	80.0%	-$4,200	Still below break-even; small demand swings matter.
Base post-break-even case	$52,500	$10,000	$34,600	80.9%	$7,900	Clears break-even and shows a modest monthly cushion.
Full-scale mature case	$338,750	$55,600	$63,000	83.6%	$220,300	Well above break-even; scale gives strong operating room.

What breaks first if launch sales slip or costs run hot?

Stress test

At $27,000 monthly revenue, the plan sits about $5,250 below break-even and burns roughly $4,200 a month. A 10% sales miss, a 10% fixed-cost jump, or a 5-point margin drop each pushes losses wider fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$32,250	$5,250 gap	Launch revenue is still below break-even.
Revenue shortfall	Monthly revenue falls 10% to $24,300.	$32,250	$7,950 gap	The monthly loss widens to about -$6,300.
Fixed-cost increase	Fixed costs rise 10% to about $28,380 a month.	$35,400	$8,400 gap	Rent, payroll, or software creep pushes break-even higher.
Margin pressure	Variable expenses rise 5 points, cutting contribution margin to 75%.	$34,400	$7,400 gap	Higher shipping, breakage, or returns eat into launch margin.
Combined pressure	Revenue falls 10%, fixed costs rise 10%, and margin drops 5 points.	$37,800	$10,800 gap	At $27,000 revenue, the launch loses about -$10,100 a month.

What should you verify before signing the lease and placing the first inventory order?

Founder checklist

Don’t sign the lease or bulk-buy inventory until Year 1 orders, margin, and cash still hold at model levels. The business needs about $797,000 of minimum cash and doesn’t reach break-even until Month 14, so early sales must cover a long ramp, not just a good launch month.

1Demand Proof$76.25 AOV

Verify early order value and the $15 CAC before scaling ads, because paid growth only works if each sale can cover acquisition fast enough.

2Fixed Load$7.05K/mo

Check that rent, software, utilities, insurance, automation, and accounting stay near this monthly level, because fixed costs hit before volume does.

3Unit Margin80% CM

Confirm that Year 1 COGS and variable fees stay at 20.0% of revenue, with platform plus 3PL fees at 5.0% combined, so margin can absorb payroll and overhead.

4Staffing Ramp2.0 FTE

Keep Year 1 staffing limited to the founder plus half-time marketing and content support, and don’t add full-time help until order flow can carry the extra payroll.

5Cash Runway$797K / M14

Hold enough cash for the modeled minimum cash need, because break-even doesn’t land until Month 14 and Year 1 EBITDA is still negative.

6Returns Test$45K buy

Test packaging, return handling, and supplier MOQ against the initial inventory purchase, since fragile-item damage and low repeat buying at 0.08 orders a month per repeat customer can erase margin.