Compressed Air System Audit Break-Even: ~$586K Monthly Revenue

Fixed costs $35.1K/mo Monthly base

Contribution margin 73% After variable spend

Break-even revenue $48.1K/mo Monthly target

Break-even timing Month 10 Ramp to break-even

Break-even calculator

Use this calculator to test monthly revenue, variable expenses, and fixed costs against break-even for a compressed air system audit service.

Lean Base Full

Monthly revenue Revenue sets the margin available to cover fixed costs. $ Slow month Busy month Variable expenses Use direct costs that rise with each audit or job. $ Tight costs High costs

Money available to cover fixed costs $32,000 $58,000 revenue - $26,000 variable expenses

Margin ratio

55%

Covers fixed costs

$3,100 short

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

Break-even chart Revenue Total costs

Which expenses are fixed and which move with sales in a compressed air audit business?

Cost classification

Break-even gets cleaner when delivery costs stay below the revenue line and overhead stays fixed. In the first year, variable delivery drag starts at 27% of revenue, while fixed overhead and payroll set the monthly hurdle.

Expense	Cost	Break-Even Treatment	Common Mistake
Office Rent	Fixed	Include $4,500 per month in the fixed overhead base.	Pushing rent into job margin and overstating delivery profit.
Professional Liability Insurance	Fixed	Include $1,200 per month before calculating the revenue needed to break even.	Treating insurance as optional until audits scale.
Cloud Infrastructure and IT Support	Fixed	Include $850 per month as baseline operating overhead.	Allocating the full charge to each audit and distorting job pricing.
Field Travel and Lodging	Variable	Deduct 12% of first-year revenue as job-level delivery spend.	Treating travel leakage as overhead instead of margin pressure.
Sensor Consumables and Calibration	Variable	Deduct 4% of first-year revenue before contribution margin.	Ignoring small usage items that compound across onsite work.
Sales Commissions	Variable	Deduct 5% of revenue as sales volume grows.	Modeling commissions as fixed payroll and overstating contribution.
Digital Marketing Fees	Variable	Deduct 6% of first-year revenue, separate from the annual marketing budget.	Mixing media spend, acquisition budget, and revenue-linked fees.
Delivery and Support Payroll	Semi-fixed	Use first-year salaries of $304,000, about $25,300 per month, then step up when staffing rises.	Spreading payroll as a flat revenue percentage and missing hiring cliffs.

How does break-even shift from a lean first-year load to the base case and then the full-volume path?

Scenario table

Break-even moves with revenue density and the labor base. Lean work misses overhead, the base case just covers it, and the full-volume path adds enough monthly revenue to create a small cushion.

Scenario figures use planning assumptions from the model, so they show direction, not guaranteed results.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean first-year audit load	$43.3k	$11.7k	$42.8k	73%	-$11.2k	Still below break-even, so fixed overhead is not covered.
Base break-even path	$58.6k	$15.8k	$42.8k	73%	$0	This is the break-even point; small misses turn into losses.
Full-volume year-two path	$96.9k	$36.7k	$51.4k	62%	$8.8k	Above break-even, but the cushion is still modest.

What breaks first if revenue slips or costs rise?

Stress test

The plan is most exposed to revenue softness, higher fixed overhead, and margin drift from travel, discounts, or subcontracted specialist hours. At a 73% margin, a 20% revenue miss leaves an $8,600 monthly hole, and 10% higher fixed costs push break-even to $64,400.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	Base case holds at a 73% margin and a $42,700 monthly fixed load.	$58,600	$0 gap	Break-even lands in Month 10.
Revenue shortfall	Revenue lands 20% below the $58,600 base case.	$46,900	$8,600 gap	A 20% miss leaves a tight monthly hole.
Fixed-cost pressure	Monthly fixed load rises 10% above $42,700.	$64,400	$5,800 gap	Overhead drift pushes the hurdle up fast.
Margin pressure	Contribution margin falls from 73% to 68%.	$62,800	$4,200 gap	Discounts or subcontracted hours eat cushion.
Combined pressure	Revenue drops to $46,900, margin slips to 68%, and fixed load rises 10%.	$69,100	$15,100 gap	Three hits together create a sharp monthly gap.

Can this compressed air audit service win enough jobs to justify the first payroll and equipment buy?

Founder checklist

Before you add fixed payroll and launch spend, prove the model can sell and deliver at break-even pace. The key tests are 7 audit-equivalent jobs a month, Month 10 break-even, and a $660,000 cash floor through Month 17.

1Demand proof7 jobs/mo

Verify you can book at least 7 audit-equivalent jobs per month before adding more fixed payroll, because that is the cleanest sign the market can carry the model.

2Year 1 capacity40 hrs

Confirm Year 1 staffing can handle 40-hour system audits at $225 per hour, so delivery does not break when sales start landing.

3Launch capex$131.5K

Check that the full launch build stays near the listed $131,500 across detectors, meters, analyzers, laptops, office gear, vehicle, software, website, and portal.

4Cash cushion$660K

Protect cash through Month 17, because the model’s minimum cash point is $660,000 and a thinner cushion leaves no room for slow sales or delayed collections.

5CAC test$2.8K

Test whether your real customer acquisition cost stays close to the Year 1 assumption of $2,800, since a higher CAC pushes break-even out fast.

6Delivery flowMonth 10

Lock proposal templates, site-access steps, safety rules, calibration timing, report turnaround, insurance, travel rules, and client data handoff before scaling so Month 10 break-even stays believable.