Welding Fume Extraction Break-Even Revenue: ~$71K/Month

Fixed costs $45.8K/mo Year 1 base

Contribution margin 70% After variable costs

Break-even revenue $65.4K/mo Cover fixed base

Break-even timing Month 9 Forecast break point

Break-even calculator

Test how monthly revenue, direct costs, and overhead line up against break-even.

Lean Base Full

Monthly revenue Revenue drives the cash left after direct costs to cover fixed overhead. $ Slow start Busy month Variable expenses These rise with jobs and include direct labor, hardware, shipping, and commissions. $ Low direct cost High direct cost

Money available to cover fixed costs $45,675 $65,250 revenue - $19,575 variable expenses

Margin ratio

70%

Covers fixed costs

$92 short

Fixed monthly costs This is the monthly overhead break-even must cover before profit starts. $ Lean overhead Heavy overhead

Break-even chart Revenue Total costs

Which expenses are fixed, and which move with sales in a welding fume extraction business?

Cost classification

Break-even is reliable only when project costs stay tied to revenue and true overhead stays fixed. If hardware gets buried in overhead, contribution margin looks too high and Month 9 break-even can be overstated.

Expense	Cost	Break-Even Treatment	Common Mistake
Facility and admin overhead	Fixed	Model rent at $6,500/month, insurance at $1,200/month, software at $850/month, utilities at $1,100/month, and admin/legal at $1,500/month as stable monthly overhead.	Spreading these costs across jobs and treating them like direct project costs.
General manager and salaried operating staff	Semi-fixed	Treat salaries as capacity blocks; FTE rises in later years as engineers, installers, sales, and support staff are added.	Assuming payroll grows smoothly with revenue instead of stepping up with headcount.
Filtration and hardware components	Variable	Use 18% of revenue in the first year, declining to 15% by the mature year, as direct project material cost.	Putting project materials into overhead, which understates contribution margin pressure.
Installation subcontracting and labor	Variable	Use 8% of revenue in the first year, declining to 6% by the mature year, because the cost follows installation volume.	Treating subcontracted labor as fixed just because crews are planned in advance.
Sales commissions and referral fees	Variable	Model at 3% of revenue in every year, directly below gross margin in the break-even calculation.	Leaving commissions in sales overhead and overstating profit per job.
Consumable shipping and logistics	Variable	Model at 1% of revenue in every year, tied to project shipments, filters, and consumables.	Ignoring small percentage costs that add up as revenue scales.
Fleet fuel and vehicle maintenance	Semi-variable	Start with the $2,200/month planning amount, then review usage as job count, site distance, and service routes increase.	Treating the full fleet line as fixed when mileage and service calls move with activity.

How does break-even shift as welding fume extraction work moves from lean to base to full utilization?

Scenario table

As utilization rises, revenue grows faster than the fixed cost load, so break-even gets easier to reach. The lean case stays below break-even, the base case clears it, and the full case has the widest cushion.

Planning assumptions only; actual results will move with project mix, pricing, and staffing pace.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch case	$65.3k	$19.6k	$54.6k	70.0%	-$8.9k	Still below break-even, so launch timing matters.
Base staffed case	$123.2k	$35.1k	$69.3k	71.5%	$18.8k	Clears break-even with a modest cushion.
Full-utilization case	$295.0k	$73.8k	$132.5k	75.0%	$88.8k	Well above break-even if work stays full.

What breaks the break-even plan for welding fume extraction systems?

Stress test

The opening-year plan is close to break-even, so small misses in bookings or cost control can flip it into a cash gap. The biggest risks are slower installs, higher subcontractor or freight costs, and overhead that grows faster than revenue.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$65.4K	$0.1K gap	Near-breakeven leaves little room for misses.
Revenue shortfall	Bookings fall 15% below the Year 1 average.	$65.4K	$9.9K gap	Fewer booked installs push the month under water.
Fixed-cost pressure	Fixed overhead rises 10%.	$71.9K	$6.7K gap	Higher overhead lifts the hurdle fast.
Margin pressure	Variable expense rate rises 5 points, cutting contribution margin to 65%.	$70.4K	$5.2K gap	Subcontractor hikes or rework eat the cushion.
Combined pressure	Bookings fall 15%, margin drops to 65%, and overhead rises 10%.	$77.5K	$22.0K gap	Slow bookings and cost creep break the plan fast.

Can you prove enough welding-fume project demand before you sign the lease and hire the crew?

Founder checklist

The model shows Year 1 revenue at $783K, or about $65.3K a month, so a launch pipeline below $71K a month leaves little room for misses. Test that demand against the $45.8K monthly load and the $542K cash trough before you lock in the warehouse.

1Launch Demand$71K/mo

Verify you can book at least $71K a month at launch; the model's Year 1 revenue averages about $65.3K a month, so anything softer means the lease and crew will outrun sales.

2Job Math$6.75K/job

Check that a custom design and install still averages 45 billable hours at $150 an hour, because each project only throws off $6.75K before add-ons and repeat work.

3Add-on Mix40% / 20%

Make sure 40% of installs can convert to maintenance and 20% to air quality audits, since the recurring side of the business has to lift revenue after the first job.

4Supplier Terms70% CM

Hold filtration and hardware near 18% of revenue, with 8% installation subcontracting, 3% commissions, and 1% shipping, or the contribution margin slips from about 70% before fixed costs.

5Crew Load$45.8K/mo

Confirm the Year 1 team of 1 general manager, 1 mechanical design engineer, 1 lead installation technician, 0.5 industrial hygienist, and 1 B2B sales account manager can run without adding payroll too early.

6Cash Runway$542K

Keep at least $542K on hand through Month 8, and do not commit to warehouse rent until booked installs make that cushion look safe.