Break-Even Point Calculator
Calculate the number of units you must sell at a given price to cover all of your fixed and variable costs — the moment a product or business starts generating profit instead of losing money on each sale. Use it as a quick filter for pricing decisions, new-product launches, and capital projects.
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 the contribution margin per unit — the dollars each sale contributes toward covering fixed costs after variable costs are paid. Once enough units sell for total contribution to equal total fixed costs, the business has broken even; every additional unit adds its contribution margin directly to operating profit. Fixed costs are expenses that do not vary with unit volume in the short term: rent, salaried staff, base utilities, SaaS subscriptions, depreciation, insurance, base marketing budget. Variable costs scale linearly with unit volume: raw materials, packaging, freight outbound, sales commissions, credit-card processing fees, hourly direct labor. Selling price is the per-unit revenue you actually realize (gross, before discounts or returns). Edge case: if selling price ≤ variable cost per unit, contribution margin is zero or negative — every sale loses money and the business cannot break even at any volume; the calculator returns "N/A" rather than infinity or a negative number. The formula assumes constant prices, constant unit costs, a single product, and that fixed costs do not step up at higher volumes (no second warehouse, no second shift, no additional headcount). Real businesses violate these assumptions all the time, so break-even is a planning tool not a precise prediction. The most useful pair is break-even units (this calculator) and margin of safety = (actual sales − break-even sales) ÷ actual sales × 100, which tells you how much demand could drop before you lose money.
How to use
Example 1 — Candle business. Monthly fixed costs $5,500 (workshop rent $2,000, your base draw $3,000, software/insurance $500). Each candle costs $4 in materials, packaging, and shipping. You sell each at $25. Enter 5500 for Fixed Costs, 25 for Price per Unit, and 4 for Variable Cost per Unit. Result: 262 units. Verify: contribution margin = 25 − 4 = $21; 5500 / 21 ≈ 261.9, rounded to 262 units. ✓ You need to sell 262 candles a month just to cover costs; the 263rd candle is where operating profit begins. At 262 units, revenue is 262 × $25 = $6,550 and total costs are $5,500 + (262 × $4) = $6,548 — confirmed break-even. Example 2 — SaaS startup. Monthly fixed costs $80,000 (engineering salaries, office, baseline infrastructure, baseline marketing). Variable cost per customer $8/month (hosting, support, payment processing). Subscription price $49/month. Enter 80000, 49, and 8. Result: 1,952 customers. Verify: contribution margin = 49 − 8 = $41; 80000 / 41 ≈ 1951.2, rounded up to 1,952. ✓ At 2,000 paying customers the company covers baseline burn, and each additional customer contributes $41 toward profit (before considering customer acquisition cost). This number gives founders a concrete fundraising and growth target separating "burning cash" from "self-sustaining."
Frequently asked questions
What is contribution margin and why does it matter for break-even?
Contribution margin is selling price minus variable cost — the dollars each unit sold "contributes" toward covering fixed costs and (after break-even) toward profit. As a ratio, contribution margin per unit ÷ selling price = contribution margin ratio, telling you the percentage of each sale that flows to fixed-cost coverage and profit. High contribution margin ratios (software, digital downloads at 80–95%) mean the business breaks even at low volumes because each sale carries a lot of the load; low contribution margin ratios (groceries, commodity manufacturing at 5–15%) require massive volumes to break even and are extremely sensitive to price changes. Break-even in units uses per-unit contribution margin; break-even in revenue is fixed costs ÷ contribution margin ratio. Understanding contribution margin is the foundation of pricing, cost-cutting, and product-mix decisions.
What is the margin of safety?
Margin of safety is the gap between actual or forecast sales and the break-even point, expressed in units, dollars, or as a percentage. If you break even at 262 units and actually sell 400, your margin of safety is 138 units or 35% — meaning sales would have to drop by 35% before you started losing money. A large margin of safety means the business can absorb downturns; a thin margin (5–10%) means a small dip in demand or small increase in costs can wipe out profitability. For lenders and investors, margin of safety converts break-even from a single number into a risk metric. A business plan that requires 95% of theoretical capacity to break even is a very different proposition from one that breaks even at 30% utilization. Add margin-of-safety analysis to any pricing or capacity decision.
How does break-even change with multiple products?
With multiple products, you cannot just sum unit break-evens because each product has a different contribution margin. The standard approach is a weighted-average contribution margin: weight each product's contribution margin by its share of expected revenue mix, then divide total fixed costs by the weighted-average margin to get break-even revenue. For example, if Product A has $20 contribution and is 60% of revenue, and Product B has $5 contribution and is 40%, the weighted-average contribution is (20×0.6 + 5×0.4) = $14; total fixed costs ÷ 14 gives break-even units of the typical "mix bundle". The shortcut breaks down if the actual mix differs from the assumed mix — selling more of the lower-margin product than expected raises real break-even. For complex multi-product businesses, a spreadsheet with the actual expected mix is more accurate.
What are the most common mistakes people make in break-even analysis?
The biggest is misclassifying costs — putting a variable cost into the fixed bucket or vice versa distorts the contribution margin and produces a wildly wrong break-even. Salaries are tricky: a salaried employee is fixed in the short run but becomes variable when you need to hire a second one to handle higher volume. The second is ignoring step-function fixed costs — at some volume you outgrow the current space, need additional staff, or hit AWS reserved-capacity limits, and the "fixed" cost line jumps. The third is forgetting that pricing affects volume: cutting the price to undercut competitors lowers contribution margin but might raise unit volume, and break-even alone cannot tell you the net effect. The fourth is treating break-even as a target rather than a floor — covering costs is not a business goal, generating returns above cost of capital is. The fifth is using a single break-even number for multi-year planning without rerunning the analysis as costs and prices shift.
When should I not use this calculator?
Skip it for businesses where pricing varies by customer (B2B with negotiated rates), where the product bundles services with separate cost structures, or where unit volume is low enough that the per-unit framing isn't meaningful (custom consulting, bespoke manufacturing). It is the wrong tool for service businesses with no clear "unit" — for those, use break-even in revenue based on average contribution margin ratio. Do not use it for subscription businesses without modeling churn separately; the relevant SaaS question is "what LTV/CAC ratio supports sustainable growth given churn," not "how many customers do we need to break even." It assumes selling price exceeds variable cost — if it doesn't, no break-even exists and the calculator returns N/A. Do not use a single break-even number for multi-year planning; rerun quarterly as costs and prices shift, and pair with margin of safety for a full risk picture.