Plastic Bottle Manufacturing Break-Even Analysis: $99K Monthly Revenue

Fixed costs $35.8K/mo Base overhead

Contribution margin 89% After variable costs

Break-even revenue $98.3K/mo Monthly target

Break-even timing Month 1 Launch month

Break-even calculator

Use this to test monthly revenue, variable expenses, and fixed costs against break-even for plastic bottle manufacturing.

Lean Base Full

Monthly revenue Monthly sales drive the margin left to cover factory overhead. $ Lower sales Higher sales Variable expenses These are direct costs that rise as output and sales grow. $ Tighter costs Higher costs

Money available to cover fixed costs $112,675 $127,917 revenue - $15,242 variable expenses

Margin ratio

88%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly overhead the margin must cover. $ Lean overhead Heavy overhead

Break-even chart Revenue Total costs

Which expenses are fixed and which move with bottle sales?

Cost classification

Break-even is only reliable when fixed expenses, variable expenses, semi-variable expenses, and semi-fixed expenses are split correctly. Misclassifying payroll or plant overhead can make Month 1 break-even look safer than cash reality.

Expense	Cost	Break-Even Treatment	Common Mistake
Factory Rent ($25,000/month)	Fixed	Include as monthly overhead before calculating unit break-even.	Spreading rent per bottle and hiding idle-capacity risk.
Office Rent ($5,000/month)	Fixed	Include in fixed operating overhead from Month 1 through Month 60.	Leaving office space out because production happens elsewhere.
Business Insurance ($1,500/month)	Fixed	Treat as a stable monthly charge in the planning range.	Linking insurance to bottle volume without policy support.
Management and plant payroll ($620,000/year, about $51,667/month in Year 1)	Semi-fixed	Model base salaries as blocks that step up with staffing plans.	Treating all plant labor as Variable when supervisors step up in blocks.
Raw Material Additive ($0.0010–$0.0030 per bottle)	Variable	Deduct per unit produced before contribution margin break-even.	Using one average rate across all bottle formats.
Packaging Film ($0.0008–$0.0015 per bottle)	Variable	Apply the per-bottle rate by product size and production volume.	Putting packaging in fixed overhead and overstating margin.
Factory Utilities (0.5% of revenue)	Semi-variable	Use the model’s 0.5% revenue-linked charge in break-even math.	Treating the full utility load as fixed at low volume.
Sales Commissions (3.0% of revenue in Year 1)	Variable	Subtract 3.0% of first-year revenue from contribution margin.	Using the Year 5 rate before the sales plan earns it.

How does break-even shift from lean launch to full production?

Scenario table

As output rises, fixed overhead gets spread across more bottles, so the break-even line moves only a little while profit grows faster. This table uses planning assumptions only; it does not include machine-hour capacity, scrap rate, or a separate resin price.

Planning-case figures only; they are not guarantees and they do not include machine-hour capacity, scrap rate, or a separate resin price.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch load	$127.9k/mo	$182.9k/yr	$87.5k/mo	88.1%	$206k/yr	Launch clears break-even, but the cushion is still thin.
Base Year 3 line	$258.3k/mo	$343.4k/yr	$94.1k/mo	88.9%	$1,469k/yr	Overhead is better spread, so break-even risk drops.
Full Year 5 line	$418.8k/mo	$506.9k/yr	$108.3k/mo	89.9%	$2,958k/yr	High utilization gives the widest break-even cushion.

What breaks the break-even plan if sales soften or costs creep up?

Stress test

The base case clears break-even by about $286k a month, but the cushion shrinks fast if purchase orders slow, resin-linked inputs rise, or overhead creeps up. The combined stress case leaves only about $25k of room.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$993k	$286k cushion	The plan has room, but not a lot.
Revenue shortfall	Monthly revenue falls 10% to $1.151M.	$993k	$158k cushion	A 10% sales drop cuts the room by about $128k.
Fixed-cost pressure	Fixed monthly costs rise 10% to $962k.	$1.092M	$187k cushion	More overhead pushes break-even up fast.
Margin pressure	Variable expenses rise 20% to about $183k monthly.	$1.021M	$258k cushion	Higher resin, scrap, or rework eats contribution margin.
Combined pressure	Revenue falls 10%, variable spend rises 20%, and fixed costs rise 10%.	$1.254M	$25k cushion	One weak month could wipe out the safety buffer.

Can you prove the bottle plant clears break-even before you sign the lease and buy the first machines?

Founder checklist

Yes, but only if you can clear roughly $99.3K in monthly break-even revenue and fund the -$884K cash trough in Month 9. The first-year 12.5M-unit mix and 88.1% contribution margin are the proof points.

1Demand proof12.5M units

Verify signed orders or a real pipeline can absorb the Year 1 mix of 5.0M water, 3.0M juice, 2.0M soda, 1.5M milk, and 1.0M cosmetic bottles before you lock the plant.

2Fixed load$87.5K/mo

Check that $35.8K of fixed overhead plus $51.7K of Year 1 payroll stays covered at the planned run rate, because break-even gets tight if costs rise before volume does.

3Margin test88.1% CM

Confirm the blended contribution margin stays near 88.1% in Year 1, since that is what turns about $99.3K of monthly break-even revenue into a believable target.

4Shift ramp$2.37M capex

Verify one injection molding machine at $750K and one blow molding machine at $600K can cover the forecast mix inside the $2.37M capex plan, and hire only to confirmed shifts.

5Cash cushion-$884K M9

Hold enough cash to survive the Month 9 low point, because the model bottoms at negative $884K and payback still takes 45 months.

6Supplier terms4 inputs

Lock terms on raw material additive, packaging film, freight handling, and tooling, then test quality control specs before high-volume orders so scrap and rework do not break the margin.