Sound Isolation Booth Break-Even: About $100K Monthly Revenue

Fixed costs $55.9K/mo Base burn

Contribution margin 55% After variable costs

Break-even revenue $102.0K/mo Monthly target

Break-even timing Month 2 Early ramp

Break-even calculator

Use this to test how monthly revenue, variable costs, and fixed costs shape break-even for portable sound isolation booths.

Lean Base Full

Monthly revenue Revenue is the money coming in before direct costs and fixed overhead. $ Lower volume Higher volume Variable expenses These are direct costs that rise as sales grow, like production and selling costs. $ Lower costs Higher costs

Money available to cover fixed costs $722,150 $1,226,667 revenue - $504,517 variable expenses

Margin ratio

59%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly cost base that margin has to cover. $ Lean overhead Heavy overhead

Break-even chart Revenue Total costs

Which sound booth sales expenses are fixed, variable, or step up as volume grows?

Cost classification

Break-even only works if fixed overhead stays separate from per-unit and revenue-linked expenses. In the first operating year, the model breaks even by Month 2, so small classification errors can still distort pricing and hiring decisions.

Expense	Cost	Break-Even Treatment	Common Mistake
Warehouse Lease	Fixed	Include $12,500 per month in overhead before calculating required contribution profit.	Spreading rent across units without support for forecast volume.
Liability Insurance	Fixed	Include $1,800 per month as recurring overhead from Month 1 through Month 60.	Ignoring it because the amount looks small beside revenue.
Product Design Software Subscriptions	Fixed	Include $1,200 per month in launch burn and monthly break-even overhead.	Treating design tools as one-time setup instead of recurring spend.
Website Maintenance and Hosting	Fixed	Include $950 per month as baseline selling infrastructure, even before order volume scales.	Leaving hosting out because payment fees are already modeled.
Payroll for Management, Design, Marketing, Logistics, and Support	Semi-fixed	Use about $35,417 per month in the first year, then step up as full-time equivalents increase.	Modeling salaries as if they rise smoothly with each unit sold.
Acoustic Foam, Aluminum Frame, Fabric Wrap, Assembly Labor, and Packaging	Variable	Apply per-unit material and labor amounts to each booth or shield sold.	Using one blended unit cost across very different product sizes.
Factory Quality Control, Manufacturing Overhead, Utilities, Scrap, and Maintenance	Variable	Include the revenue-based production percentages in cost of goods sold.	Putting shop-floor production burden below gross margin.
Digital Ads, Payment Fees, and Influencer Commissions	Variable	Reduce contribution margin directly using first-year rates of 10.0%, 3.5%, and 4.0% of revenue.	Counting sales revenue before channel fees and commissions.

How does break-even change from a lean launch to a full-volume booth business?

Scenario table

Contribution margin is what's left after variable costs. As volume rises and the product mix improves, fixed payroll and overhead get spread over more sales, so the break-even floor shifts from about $102k/month to about $147k/month.

Planning figures only. Real results can move with channel mix, inventory posture, discounting, and freight.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch floor	$102k	$46k	$56k	54.8%	$0	This is the launch floor; slower sales burn cash.
Base Year 1 operating case	$603k	$273k	$56k	54.8%	$275k	Year 1 stays well above break-even, with room for growth spend.
Full Year 5 scale case	$1.89M	$764k	$88k	59.5%	$1.04M	Scale gives a wide cushion and a much lower break-even floor.

What would push this sound booth business off break-even?

Stress test

Year 1 revenue is far above the break-even line, but the cushion depends on keeping costs in check. If demand slows, hiring lands early, or ads and fees run hotter, the line moves up fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	Year 1 average revenue holds near $603,000 per month.	$100,000	$503,000 cushion	Strong launch cushion before EBITDA turns negative.
Revenue shortfall	Monthly revenue drops 25% from the Year 1 average.	$100,000	$352,000 cushion	Demand can weaken and still clear break-even, but the buffer shrinks fast.
Fixed-cost pressure	Annual fixed costs rise from about $559,000 to $875,000.	$156,000	$447,000 cushion	Early hiring and overhead push the break-even line up.
Margin pressure	Ads, fees, and commissions run 20% higher than planned.	$125,000	$478,000 cushion	Higher customer acquisition cost and discounting eat into coverage.
Combined pressure	Fixed costs rise to $875,000 and contribution margin falls 20%.	$195,000	$408,000 cushion	Slow demand plus early hiring is the harshest launch-risk case.

What should you verify before you lock the warehouse and build-out for sound isolation booth sales?

Founder checklist

The deal works only if Year 1 demand, the fixed monthly burn, and launch cash all hold before you lock the warehouse and build-out. Here’s the quick math: 5,100 Year 1 units, about $20.45K in monthly fixed overhead, and $1.102M minimum cash in Month 1.

1Demand Proof5,100 units

Verify the Year 1 forecast of 5,100 units across the five booth models, because that is the volume the fixed-cost plan assumes.

2Fixed Burn$20.45K/mo

Confirm the warehouse can support the $12.5K lease and the full $20.45K monthly fixed overhead before you order units, or storage will choke fulfillment.

3Unit COGS$105-$1.36K

Check supplier lead times, quality checks, packaging, and per-model COGS from $105 to $1,360, because weak build cost kills margin fast.

4Build Capex$200K

Test the need for the $200K build-out stack for racking, forklift, acoustic testing, e-commerce, and showroom displays before you hire sales help.

5Payroll Cover$425K/yr

Confirm Year 1 EBITDA of $3.294M can carry the $425K payroll base and a support team, because installs and returns need fast answers.

6Cash Cushion$1.102M

Keep the Month 1 minimum cash floor at $1.102M and watch Month 2 break-even, because complex installs and returns can slow collection.