Investment Casting Break-Even Analysis: $111K Monthly Revenue

Fixed costs $90.6K/mo Payroll-heavy base

Contribution margin 81.3% After variable costs

Break-even revenue $111.6K/mo Monthly target

Break-even timing Month 1 Launch month

Break-even calculator

Test monthly sales against direct costs and the fixed cost base to see when this process clears break-even.

Lean Base Full

Monthly revenue Use monthly sales before costs; it sets the margin pool. $ Low output High output Variable expenses Use direct materials, labor, commissions, and other costs that rise with output. $ Tight spend High spend

Money available to cover fixed costs $1,681,617 $2,030,417 revenue - $348,800 variable expenses

Margin ratio

83%

Covers fixed costs

Yes

Fixed monthly costs Use rent, salaries, software, and other monthly costs you pay even if output slows. $ Lean overhead Scaled overhead

Break-even chart Revenue Total costs

Which investment casting expenses are fixed, and which move with sales volume?

Cost classification

Break-even gets unreliable when unit-driven costs get buried in overhead. Keep stable monthly spend separate from materials, labor, inspection, and sales fees that move with product mix and volume.

Expense	Cost	Break-Even Treatment	Common Mistake
Facility Rent	Fixed	Carry $15,000/month from Month 1 through Month 60 as base overhead before contribution margin.	Allocating rent per unit and making margin look better at higher volume.
Salaried Operating Payroll	Fixed	Model first-year payroll at $785,000/year, about $65,417/month, before planned staffing step-ups.	Treating all payroll as variable when salaries are committed monthly.
Raw Material Alloys and Consumables	Variable	Apply per unit using the bill of cost, from $125 per automotive sensor housing to $430 per medical implant.	Using one blended material rate and missing product mix shifts.
Direct Casting, Finishing, and Machining Labor	Variable	Charge per unit because casting, finishing, machining, and inspection labor are listed inside unit-level production costs.	Rolling direct labor into overhead and overstating contribution margin.
Utilities Base and Melting Energy	Semi-variable	Use $3,000/month for the base utility load, then add energy per unit, such as $30 for each turbine blade.	Modeling the full utility bill as fixed and missing furnace usage.
Sales Commissions and Variable Marketing	Variable	Apply first-year revenue rates of 3.0% for sales commissions and 1.5% for client acquisition.	Forgetting sales fees when revenue ramps and break-even looks too early.
NDT, Finishing, Certifications, and Compliance	Variable	Apply product-level revenue percentages, such as 0.3% NDT services for turbine blades and 0.7% aerospace certifications for brackets.	Treating scrap, rework, NDT, finishing, and certifications as overhead when they move with job mix.
Quality Control Staffing and Inspection Workflow	Semi-fixed	Step staffing from 1.0 FTE in the first year to 2.0 FTE by the third year as volume rises.	Assuming inspection capacity scales smoothly with each unit produced.

How does break-even change from lean launch to full utilization in investment casting?

Scenario table

Fixed costs stay heavy, so break-even moves mostly with revenue and variable spend. Lean volume stays short, the base plan clears break-even, and fuller use builds a much wider cushion.

Planning assumptions only; actual mix, yield, and scrap can move break-even.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch mix	$90K	$18K	$91K	80.5%	-$18K	Still below break-even, so launch volume needs a lift.
Base Year 1 plan	$945K	$185K	$91K	80.5%	$670K	Clears break-even with room, so the plant is viable at planned volume.
Full Year 2 utilization	$1.447M	$260K	$91K	82.0%	$1.096M	Wide cushion; the main risk shifts to throughput, not break-even.

What breaks the break-even plan for investment casting?

Stress test

The base plan has room, but it tightens fast if quotes slow, scrap rises, or plant overhead climbs. Variable expenses are the biggest swing factor, and that is where the cushion can shrink the fastest.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$267K	$678K cushion	Base case clears break-even with a wide cushion.
Revenue shortfall	Monthly revenue falls 20% to $756K.	$267K	$489K cushion	Delayed quotes or lost awards cut the cushion fast.
Fixed-cost pressure	Fixed costs rise 15% to about $1.042M monthly.	$128K	$817K cushion	Overhead creep pushes the floor higher.
Margin pressure	Variable expenses rise from 187% to 237% of revenue.	$119K	$826K cushion	High scrap, rework, and energy spikes hit margin.
Combined pressure	Revenue falls to $756K, variable expenses rise to 237%, and fixed costs rise 15%.	$283K	$473K cushion	Multiple hits still clear break-even, but the cushion shrinks hard.

What should an investment casting founder verify before signing the lease and buying equipment?

Founder checklist

Before you commit, make sure quotes, throughput, and cash can carry the break-even load. For this model, that means real demand, not just interest, plus enough buffer for rework, slow payments, and ramp delays.

1Demand proof$111K/mo

Prove quotes and repeat orders can reach at least $111K a month before you scale overhead; if they do not convert, pause more marketing spend and tighten the offer.

2Fixed load$90.6K/mo

Add the $25.2K nonpayroll overhead and $65.4K base payroll before you commit, because this is the monthly burn the plant must clear.

3Contribution margin83.4% CM

Price the Year 1 mix against full unit costs plus the 4.5% sales-side spend; the forecast still leaves about 83.4% contribution before fixed overhead.

4Input pricing5 inputs

Lock pricing for alloy, shell materials, chemicals, packaging, and consumables before volume ramps, because small swings hit every part you ship.

5Flow test5-stage flow

Run furnace, shelling, finishing, machining, and inspection as one line before hiring more people, since any bottleneck will push breakeven out.

6Cash cushion$1.021M

Keep at least $1.021M cash ready at launch to cover rework, slow collections, and ramp delays, since the model’s minimum cash point hits in Month 1.