Machine Part Manufacturing Break-Even: $946K Monthly Sales

Fixed costs $23.7K/mo Base overhead

Contribution margin 82% After variable spend

Break-even revenue $28.9K/mo Monthly target

Break-even timing Month 1 Launch month

Break-even calculator

Test how monthly revenue, variable expenses, and fixed monthly costs set the break-even point for machine part manufacturing.

Lean Base Full

Monthly revenue Revenue is the top line that funds variable costs and fixed overhead. $ Low sales High sales Variable expenses Direct materials, machining labor, and variable overhead rise with output. $ Lean cost Heavy cost

Money available to cover fixed costs $424,785 $493,292 revenue - $68,507 variable expenses

Margin ratio

86%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly overhead base contribution margin must cover. $ Slim overhead Big overhead

Break-even chart Revenue Total costs

Which machine part manufacturing expenses are fixed, and which move with sales?

Cost classification

Break-even is only reliable when shop overhead is separated from production-driven spend. Treat rent and software as fixed, but model materials, commissions, utilities, maintenance, and staffing based on how they behave as unit volume rises.

Expense	Cost	Break-Even Treatment	Common Mistake
Facility rent (factory and office)	Fixed	Use $12,000 per month in the fixed overhead base for the planning range.	Spreading rent across units and hiding underused shop capacity.
Software licenses (CAD/CAM, ERP, CRM)	Fixed	Use $3,000 per month as recurring overhead before contribution margin.	Linking licenses to unit volume when the model treats them as monthly spend.
Gear Shaft specialty steel	Variable	Apply $18 per Gear Shaft produced as direct unit COGS.	Using an average material rate across all parts and missing product margin differences.
Sales commissions	Variable	Apply 2.5% of first year revenue, then use the lower forecast rates in later years.	Modeling commissions as fixed payroll and overstating margin at lower sales volume.
Factory utilities	Semi-variable	Split the $2,500 monthly utility base from usage-linked factory utilities tied to production revenue.	Treating all utilities as fixed when spindle hours rise with throughput.
Machine maintenance	Semi-variable	Keep the $2,000 monthly maintenance contract fixed, then add usage-linked maintenance by product line.	Ignoring repair load, scrap, and wear as machine hours increase.
Skilled Machinist headcount	Semi-fixed	Add salary in hiring steps: 2.0 FTE in the first year, 3.0 in the second year, and 5.0 by the fourth year.	Treating labor as purely fixed while overtime and staffing steps change capacity.

How does break-even change from lean to full production for machine part manufacturing?

Scenario table

Fixed-cost coverage improves as output rises, so break-even stays in Month 1 in all three cases. The lean case has the thinnest cushion, while the full case has the widest one if quality, setup time, and order flow hold.

Planning assumptions only; actual results can move if quality, setup time, or order flow change.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean production case	$231.7k	$32.7k	$77.5k	85.9%	$121.5k	Month 1 break-even, but the cushion is thin.
Base production case	$493.3k	$68.5k	$91.2k	86.1%	$333.6k	Month 1 break-even with a much wider cushion.
Full production case	$696.9k	$95.4k	$117.9k	86.3%	$483.6k	Month 1 break-even and the strongest cushion.

What breaks the break-even plan if sales slow or costs rise?

Stress test

The base case clears break-even by about $1.37M of monthly cushion above the $946k threshold. The real risk is a slower order ramp, higher scrap or rework, and added overhead before output stabilizes.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$946k	$1,371k cushion	Base case stays well above break-even.
Revenue shortfall	Monthly revenue falls 10% and costs stay flat.	$946k	$1,139k cushion	A slower ramp still covers fixed costs, but the cushion shrinks.
Fixed-cost increase	Fixed monthly costs rise 10% from added hiring and overhead.	$1,042k	$1,275k cushion	More overhead pushes the break-even line up fast.
Margin pressure	Variable expense load rises 10% from scrap, rework, and logistics.	$968k	$1,349k cushion	Lower yield cuts cushion even if sales hold.
Combined pressure	Revenue falls 10% while fixed costs and variable costs both rise 10%.	$1,096k	$990k cushion	This is the tightest case; downtime and rework can erode the plan fast.

What should you verify before signing the factory lease and buying the first machines?

Founder checklist

Here’s the quick math: the Year 1 plan is 6,500 parts, or about $2.78M a year at the listed prices, while the break-even revenue check is $946K a month. That gap means you should only commit if pipeline demand, pricing, and cash still work after fixed costs and capex.

1Demand Proof$946K/mo

Verify signed quotes, purchase orders, or repeat orders can support that monthly revenue before you lock the lease and machine buys.

2Launch Demand6,500 parts

Check that the first-year unit plan is backed by real customer demand, because that is the production run you need to place first.

3Fixed Load$23.7K/mo

Do not commit to the $12,000 rent until the layout and throughput are clear, because fixed overhead already runs $23,700 a month before wages.

4Contribution Margin82% CM

Confirm the product mix still leaves about 82 cents per revenue dollar after unit costs and the 4.0% sales and shipping load.

5Staffing Ramp$645K/yr

Year 1 wages already total $645,000, so hire against machining, quality, and sales bottlenecks instead of building a bigger team early.

6Cash Cushion$664K

Hold at least this cash through Month 6 and phase the $1.11M capex, or the buildout can outrun collections.