Break Even Point Calculator
Calculate the number of units you must sell to cover all fixed and variable costs, returning the exact break-even unit count for any product or business model. Use it as a first-line pricing and viability check for new SKUs, subscription tiers, or product launches.
Last updated: May 2026
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About this calculator
The formula is: break-even units = fixed costs ÷ (price per unit − variable cost per unit). The denominator is contribution margin per unit — the dollars each sale contributes to covering fixed costs after variable costs are paid. Once unit volume × contribution margin = total fixed costs, the business breaks even; every additional unit adds its contribution margin to operating profit. Fixed costs don't vary with unit volume in the short term: rent, salaried staff, software subscriptions, baseline marketing, insurance, depreciation. Variable costs scale linearly with volume: raw materials, packaging, fulfillment, payment processing fees, sales commissions. Edge case: if price per unit equals or is below variable cost, contribution margin is zero or negative — the business cannot break even at any volume; the calculator returns "Undefined" rather than infinity. The formula assumes a single product, constant pricing, constant unit costs, and no step-function jumps in fixed costs at higher volumes. Real businesses violate all these assumptions, so break-even is a planning tool not a precise prediction. For multi-product businesses, weighted-average contribution margin across the product mix gives a more accurate break-even revenue figure. Margin of safety (the gap between actual sales and break-even, expressed as a percentage) translates break-even from a single number into a real risk metric — a margin of safety under 10% means a small demand drop wipes out profitability. For early-stage businesses, the more important variant is contribution margin per dollar of customer acquisition cost (CAC) rather than break-even units, since CAC dwarfs unit production cost in most direct-to-consumer business models.
How to use
Example 1 — Subscription box launch. Monthly fixed costs $12,000 (warehouse, two part-time fulfillment staff, software stack, baseline marketing). Each box costs $14 in goods + packaging. Subscription price $39/month. Enter 12000 for Fixed Costs, 39 for Price per Unit, and 14 for Variable Cost. Contribution margin = 39 − 14 = $25/box. Break-even = 12000 / 25 = 480 boxes. ✓ The business needs 480 active subscribers to cover monthly burn; box 481 starts contributing to profit. At $9 monthly customer acquisition cost (typical for subscription DTC), reaching 480 subscribers requires roughly $4,320 of acquisition spend in addition to the fixed costs — a meaningful pre-profitability investment. Example 2 — Specialty food product. Monthly fixed costs $5,500 (workshop rent, base salary, software, insurance). Each jar costs $4 to make (ingredients, jar, label, shipping in). Retail price $18. Enter 5500, 18, and 4. Contribution = $14/jar. Break-even = 5500 / 14 ≈ 393 jars/month. ✓ Selling 393 jars per month covers costs; revenue at break-even is 393 × $18 = $7,074, total variable costs are 393 × $4 = $1,572, fixed costs $5,500 — total costs $7,072, confirming break-even within rounding.
Frequently asked questions
What is contribution margin and why does it determine break-even?
Contribution margin is the price per unit minus the variable cost per unit — the dollars each sale contributes toward covering fixed costs and, after break-even, toward profit. The break-even formula divides fixed costs by contribution margin per unit to find how many units are needed for total contribution to equal total fixed costs. A high contribution margin product (digital downloads at 90%, software seats at 80%) breaks even at low volumes because each sale carries lots of fixed-cost weight; a low contribution margin product (grocery items at 10-20%, commodity goods at 5-15%) requires huge volumes to break even. For ecommerce specifically, the contribution margin must also account for variable costs that scale with orders (payment processing 2-3%, returns at 5-25%, customer-service cost per order) — not just COGS. Always compute contribution margin in dollar terms, not just as a percentage, when sizing volume requirements.
What's the difference between break-even units and break-even revenue?
Break-even units is the unit volume needed; break-even revenue is the dollar revenue at that volume (break-even units × price per unit). For single-product businesses, either works. For multi-product businesses, break-even revenue using weighted-average contribution margin ratio is more useful: BE revenue = fixed costs / contribution margin ratio. Example: if your product mix has 40% average contribution margin and fixed costs are $50,000/month, BE revenue = $50,000 / 0.40 = $125,000/month. This handles different product price points and margins simultaneously without computing per-SKU break-even points. For services or businesses without clear "units" (consulting, subscription with variable usage), break-even revenue is the natural framing. For unit-economics decisions on a specific SKU, break-even units gives a tangible volume target.
How does break-even differ for subscription businesses vs one-time sales?
For one-time sales, break-even is calculated each period (monthly or annually) — fixed costs that period vs. units sold that period. For subscription businesses, break-even reflects the cumulative active subscriber count, not new sales — once you have 500 active subscribers paying $30/month with $5 variable cost each, monthly contribution is 500 × $25 = $12,500 covering similar-magnitude fixed costs. The challenge for subscriptions is churn: if monthly churn is 5%, you lose 25 subscribers per month even before adding new ones. Net subscriber growth = new − churn. Reaching and maintaining the break-even subscriber count requires acquisition that outpaces churn, plus enough margin to fund the acquisition. For SaaS specifically, the relevant metric is LTV:CAC ratio (3:1+ for sustainable) rather than just break-even unit count — break-even tells you the floor; LTV:CAC tells you whether the business model produces returns above floor.
What are the most common mistakes people make with break-even analysis?
The biggest is misclassifying costs — treating variable costs as fixed (or vice versa) distorts contribution margin and produces wildly wrong break-even. Salaries are tricky: a single salaried employee is fixed in the short run but becomes variable when you need a second person to handle higher volume. The second is ignoring step-function fixed costs — at some volume you outgrow current space, need new hires, or hit infrastructure capacity, and fixed costs jump. The third is forgetting customer acquisition cost; for DTC ecommerce, CAC often exceeds product variable cost by multiples, so the "real" break-even must include marketing spend per acquired customer. The fourth is using break-even as a target rather than a floor — covering costs is not a business goal. The fifth is treating a single break-even number as static across the year; seasonal businesses have very different effective break-evens in peak vs. off-peak months. Finally, many ecommerce founders forget returns (typical 5-25% of orders) which directly reduce realized revenue per gross unit sold.
When should I not use this calculator?
Skip it for businesses without clear unit economics (custom services, B2B with negotiated pricing, marketplaces with variable take rates) — use break-even revenue with weighted-average contribution margin instead. It is the wrong tool for subscription businesses without modeling churn separately; reach-the-floor calculations need to factor in churn-driven attrition that erodes the subscriber base monthly. Do not use it for SaaS unit economics where LTV:CAC ratio matters more than raw break-even. The formula assumes selling price exceeds variable cost — if not, no break-even exists. For multi-product businesses, single-SKU break-even calculations can mislead about overall business health; use total revenue / total contribution margin instead. And for early-stage businesses where most costs are still scaling and pricing is being tested, break-even is moving target rather than a stable benchmark — focus on contribution margin per order and growth velocity instead.