Break-even calculator
Uses a simple monthly model: fixed overhead divided by contribution per unit (price minus variable cost). Show prospects you understand their numbers—then offer to build a tailored estimator with Calclet.
Example scenario
A specialty beverage brand carries $15,000 in monthly operating overhead rent, salaried HQ payroll booked below gross margin, core SaaS retainers, and baseline advertising treated as fixed (“Fixed monthly costs”). Each case wholesales at $99 landed distributor price (“Selling price per unit”) while ingredient COGS, outbound freight, payment fees, and co-pack labor stack to $22 fully loaded (“Variable cost per unit”). Contribution margin per case is therefore $77, so covering fixed spend requires roughly 195 equivalent unit sales per month—rounding aside fractional pallets—before incremental units flow to operating profit before debt service.
Break-even calculator
Monthly units needed to cover fixed costs
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How to estimate monthly break-even unit volume
- Roll rent, salaried overhead, mandatory software, and baseline marketing your FP&A classifies as fixed into “Fixed monthly costs”—exclude purely variable commissions unless already folded into contribution.
- Enter realized average selling price net of routine discounts into “Selling price per unit,” then burden direct materials, fulfillment, usage-based COGS, and variable merchant fees under “Variable cost per unit.”
- Subtract variable from price mentally to confirm contribution margin stays positive before trusting “Units to sell per month.”
- Stress-test by raising variable logistics five points when fuel surcharges spike—break-even climbs nonlinearly when throughput assumptions ignore seasonality.
Break-even planning anchors
- Contribution-margin sanity checks taught in FP&A boot camps
- Selling price minus incremental variable cost must stay positive—otherwise the denominator collapses toward zero and break-even volume blows up
- Typical distinction between accounting break-even and cash break-even
- Non-cash depreciation and working-capital swings often delay true cash neutrality—layer thirteen-week cash models beyond unit math
- Retail / CPG guardrail when promotions compress realized price
- Use net realized selling price after discounts and slotting unless promo spend is explicitly modeled as variable elsewhere
Best use cases
- Growth and performance planning
- Budget and forecast scenario modeling
- Client-facing pre-qualification and education
Frequently asked questions
Should commissions paid only on closed revenue sit in variable cost per unit?
Usually yes—incremental payout scales with units sold. If commissions are flat draws guaranteed regardless of volume, finance often keeps them fixed—misclassification swings break-even materially.
Why does my cash runway disagree with this break-even output?
Accrual fixed costs exclude timing realities—loan principal, inventory builds, and AR lag burn cash even when accounting contribution hits zero profit.
Can unit price equal variable cost in this model?
No useful break-even exists—denominator hits zero and contribution vanishes. Raise price, cut variable waste, or rebundle SKUs before chasing volume.
How do multi-product portfolios map into one unit?
Either blend SKUs into weighted-average price and variable costs or run separate calculators per line—single-unit abstraction hides mix shift risk.
Glossary
Scenario modeling
Comparing multiple assumption sets to estimate potential outcomes before execution.
Conversion intent
User behavior that indicates readiness to take a commercial action such as signup or purchase.
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Category: Managerial accounting & unit economicsTopics: Break-even volume, Contribution margin, Fixed cost coverage
Last reviewed: 2026-05-07
Reviewed by: Calclet Growth Team