Break-Even Calculator
Work out how many units a business must sell to cover its fixed costs — the break-even point where it stops losing money and starts to profit.
- The margin of safety is under 20%. Sales could fall only 16.7% before the business slips into a loss — a thin cushion against a demand shock.
- Fixed costs are a high share of total cost at break-even (high operating leverage). Profit accelerates quickly once you clear break-even, but losses deepen just as fast if sales stall below it.
Break-even chart
Revenue rises faster than total cost once each unit earns a positive contribution margin. They cross at the break-even point; the gap to the right is profit, the gap to the left is loss.
Sensitivity analysis
How the break-even volume moves when one lever changes by 10%. Price and margin moves shift break-even far more than an equal cut to fixed costs — which is why pricing is usually the strongest lever.
| Scenario | Break-even units (exact) | Practical | Δ vs current |
|---|---|---|---|
| Current inputs | 3,333.33 | 3,334 | — |
| Price +10% | 2,857.14 | 2,858 | -14.3% |
| Price −10% | 4,000 | 4,000 | +20.0% |
| Variable cost −10% | 3,125 | 3,125 | -6.3% |
| Fixed costs −10% | 3,000 | 3,000 | -10.0% |
How to calculate your break-even point
The break-even point is the sales level where total revenue exactly equals total cost — no profit, no loss. Four formulas drive every number this calculator returns.
Contribution margin per unit is what each sale contributes toward fixed costs once its own variable cost is paid:
Break-even in units divides fixed costs by that margin:
Break-even in revenue uses the contribution margin ratio (margin ÷ price), which is handy when you sell many products at different prices:
Margin of safety shows how far sales can fall before a loss:
Rounding. The exact break-even is usually a fraction of a unit (you cannot sell 3,333.33 items). This tool reports both the exact figure and a practical break-even rounded up to the next whole unit — because selling 3,333 units would still leave a sliver of fixed cost uncovered, so 3,334 is the first unit count that clears break-even. Practical break-even revenue is then the practical units multiplied by the price.
Worked example
A maker sells one product with these figures:
- Fixed costs: $50,000
- Selling price per unit: $25
- Variable cost per unit: $10
- Expected sales: 4,000 units
Contribution margin per unit is $25 − $10 = $15, a contribution margin ratio of 15 ÷ 25 = 60%. Break-even in units is $50,000 ÷ $15 = 3,333.33 units, which rounds up to a practical 3,334 units. Practical break-even revenue is 3,334 × $25 = $83,350 (the exact figure is $50,000 ÷ 0.60 = $83,333.33). At the expected 4,000 units, profit is 4,000 × $15 − $50,000 = $10,000, and the margin of safety is (4,000 − 3,333.33) ÷ 4,000 = 16.7% — sales could fall about a sixth before the business slips into a loss. Enter these values above to see the same numbers update live.
Contribution margin vs gross margin — they are not the same
The break-even calculation uses contribution margin per unit (price − variable cost), not gross margin per unit. Gross margin includes some fixed manufacturing overhead (in accounting reports built on absorption costing), while contribution margin is purely variable. Mixing them produces a break-even number that looks lower than it should and leads to over-optimistic planning.
Example: a coffee shop sells a cup for $5.00. Variable cost per cup (beans, milk, cup, lid, sleeve, card processing) is $1.20 — contribution margin $3.80 per cup. Gross margin per cup, after allocating $0.40 of barista labor and equipment depreciation, is $3.40 — but those $0.40 are fixed in the short run and do not change with the number of cups sold. The correct break-even uses $3.80; using $3.40 understates how many cups are needed.
Rule of thumb: for break-even, classify every cost as either fixed (unchanged in the relevant volume range) or variable (changes proportionally with each unit sold). If a cost has both components — for example, a phone bill with a flat base plus per-minute usage — split it. Tools like Microsoft Excel's GoalSeek or a structured cost ledger help keep the classification consistent across the budget.
Time-to-break-even vs units-to-break-even
This calculator returns break-even units. To convert to a break-even date or break-even month, divide by the expected unit sales rate. A business with break-even at 2,400 units selling 200 units per month will reach break-even in month 12. A business selling 600 units in month one but ramping down to 100 units per month afterwards reaches break-even much sooner in calendar time but at the same unit total.
The unit metric is the better planning anchor because it removes ramp assumptions. For investor-facing models, however, break-even date is the headline — most term sheets and SBA loan applications quote break-even in months, not units. Run both. If the gap between the unit number and the date number is large, the difference is your ramp risk.
For SaaS or subscription businesses, break-even is more naturally expressed in active customers (or active accounts) rather than units sold once. Customer lifetime value and churn become first-order variables — see also the CAC payback calculator and the churn rate calculator on this site for the SaaS extension of break-even thinking.
Margin of safety and operating leverage — reading the cushion above break-even
Break-even units tell you the survival threshold; the margin of safety tells you how much room you have above it. Margin of safety = (actual or budgeted sales − break-even sales) ÷ actual sales, expressed as a percentage. A business breaking even at 1,250 units and selling 2,000 has a margin of safety of (2,000 − 1,250) ÷ 2,000 = 37.5% — sales could fall 37.5% before the business slips into a loss. A thin margin of safety (under 20%) signals fragility to a demand shock; a wide one (over 40%) gives room to absorb a downturn or a fixed-cost step-up. It is the single best one-number summary of how exposed a cost structure is.
The companion concept is operating leverage — the ratio of fixed to variable costs. A high-fixed-cost business (software, manufacturing with heavy plant) has a high break-even point but earns a large contribution margin on every unit past it, so profit accelerates steeply once break-even is cleared. A low-fixed, high-variable business (a reseller, a services shop) breaks even quickly but profit grows slowly per unit. The trade-off is risk for reward: high operating leverage punishes a business that lingers near break-even and rewards one that runs well above it. When you raise price or cut variable cost to lower the break-even point, you are also raising contribution margin and therefore operating leverage — the two effects compound, which is why margin actions move profitability faster than equivalent fixed-cost cuts.
Break-even units by contribution margin (fixed cost = $50,000)
Illustrative break-even unit counts for a business with $50,000 in annual fixed cost, varying contribution margin per unit. Halving the margin doubles the number of units required to break even.
| Contribution margin per unit | Break-even units | Months at 100 units/month | Months at 300 units/month |
|---|---|---|---|
| $5 | 10,000 | 100 months | 33 months |
| $10 | 5,000 | 50 months | 17 months |
| $25 | 2,000 | 20 months | 7 months |
| $50 | 1,000 | 10 months | 3 months |
| $100 | 500 | 5 months | 2 months |
These are linear extrapolations and ignore growth in fixed cost as the business scales. Real businesses typically see fixed cost step-ups (additional headcount, expanded facilities) that reset the break-even calculation upward.
Common break-even mistakes
- Using gross margin instead of contribution margin. Gross margin absorbs some fixed overhead; break-even needs the purely variable margin (price − variable cost), or the result is too optimistic.
- Mixing monthly costs with annual revenue. Keep fixed costs, price and expected sales on the same period — the Period selector above is a reminder, not a converter.
- Forgetting payment fees, packaging, shipping or commissions. These are variable costs. Leaving them out understates the break-even volume.
- Ignoring the owner's salary. If the founder needs to be paid, that pay is a fixed cost — exclude it and "break-even" hides a personal loss.
- Treating semi-variable costs as fully fixed. A phone or utility bill with a base fee plus usage should be split into its fixed and variable parts.
- Ignoring capacity step-ups. Fixed costs jump when you add a shift, a machine or a hire; the linear model breaks at that threshold.
- Averaging margins across products without a sales mix. A blended margin only holds if the mix is stable; shift the mix and break-even moves.
- Confusing operating break-even with payback period. Break-even is about covering periodic costs; payback is about recovering an upfront investment over time.
When this calculator is unreliable
Break-even analysis is a planning estimate built on a single-product, linear-cost model. Treat the output as a benchmark, not a guarantee, especially when:
- You sell many products and the sales mix is unstable — each product has its own margin, so a blended figure drifts.
- Prices are dynamic (auctions, surge pricing, negotiated deals) rather than a single posted price.
- Variable costs are non-linear — volume discounts, learning curves or tiered shipping change the per-unit cost as you scale.
- Discounts and promotions cut the effective price below the list price used here.
- Production capacity is limited, so reaching the break-even volume would require a fixed-cost step-up the model does not include.
- Taxes, debt service and working capital matter — they are excluded unless you fold them into fixed costs explicitly.
- You need cash-flow break-even rather than operating break-even — timing of receipts and payments can differ sharply from the accounting view.
Frequently Asked Questions
What is the break-even point?
It is the sales level at which total revenue exactly equals total cost, so the business makes neither a profit nor a loss. Sell one unit more and you start earning profit; one unit fewer and part of your fixed costs goes uncovered.
What is the break-even formula?
Break-even units = fixed costs ÷ contribution margin per unit, where contribution margin = selling price per unit − variable cost per unit. Each unit's margin chips away at fixed costs until they are fully covered.
How do I calculate break-even revenue?
Divide fixed costs by the contribution margin ratio (contribution margin ÷ selling price). For example, $50,000 of fixed costs at a 60% margin ratio breaks even at $50,000 ÷ 0.60 = $83,333 in revenue.
What is contribution margin?
Contribution margin is what one sale contributes toward fixed costs and profit after its own variable cost is paid: selling price minus variable cost. It is purely variable, unlike gross margin, which can absorb some fixed overhead.
What is a good break-even point?
There is no single number — a good break-even is one comfortably below your realistic sales, leaving a healthy margin of safety (often 20% or more). A break-even near or above expected sales signals a fragile cost structure.
What if variable cost is higher than price?
Then the contribution margin is negative and there is no finite break-even point — every unit sold loses money, so selling more deepens the loss. You must raise the price or cut the variable cost before a break-even target is meaningful.
How do I calculate break-even for multiple products?
Use a weighted-average contribution margin based on your expected sales mix, then divide fixed costs by that blended margin (for units) or by the blended margin ratio (for revenue). The answer only holds while the mix stays roughly constant.
Does break-even include taxes?
No. Standard break-even is an operating, pre-tax measure: it covers fixed and variable costs, not income tax, interest or debt repayment. To plan around those, fold them into fixed costs explicitly or treat the result as a pre-tax floor.
What is the difference between break-even and payback period?
Break-even asks how many units cover recurring costs in a period; payback period asks how long it takes for cumulative gains to recover an upfront investment. One is measured in units of sales, the other in units of time.
How do I calculate break-even in Excel?
Put fixed costs, price and variable cost in cells, compute contribution margin as price − variable cost, then break-even units as fixed costs ÷ that margin. Excel's Goal Seek can also solve for the price or volume that makes profit equal zero.
References & Authoritative Sources
- U.S. Small Business Administration (SBA) — Calculate Your Startup Costs and Break-Even Point · consulted June 1, 2026 · Official SBA guidance — break-even is a standard reference metric for new businesses applying for SBA-backed loans
- Investopedia — Break-Even Analysis — Break-Even Point: Definition, Examples, and How to Calculate It · consulted June 1, 2026 · Standard methodology reference — formula, example, distinction between contribution margin and gross margin
- Harvard Business Review — A Quick Guide to Breakeven Analysis · consulted June 1, 2026 · Practical interpretation of break-even in management decisions — pricing, capacity, product launches
Related Calculators
Data Sources & Benchmarks
The figures below are sector after-tax net profit margins from the U.S. Census Bureau — profitability context only. Net profit margin is what remains after all costs and taxes, so it is a much smaller number than the contribution margin this calculator uses (price − variable cost, before fixed costs and tax). The two are not comparable: do not benchmark your contribution margin against these profit margins. They are never used as calculator inputs — every result above comes only from the values you enter.
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Methodology & Review
The calculator derives every output from the figures you enter. Contribution margin per unit = selling price − variable cost; break-even units = fixed costs ÷ contribution margin; break-even revenue = fixed costs ÷ contribution margin ratio; margin of safety = (expected sales − break-even units) ÷ expected sales. Practical break-even rounds the exact unit figure up to the next whole unit. The model assumes a single product (or a stable product mix), constant unit price and variable cost over the relevant range, and a linear cost structure with no step changes in fixed cost. The sector figures shown under Data Sources are after-tax net profit margins — profitability context only, never calculator inputs. Net profit margin is a different, much smaller number than the contribution margin used here, so the two should not be compared directly. Treat the output as a planning benchmark, not a contractual figure. RELIABILITY: Most reliable when product mix, prices and variable costs are stable, when fixed costs are clearly identified, and when the planning horizon is short (≤ 1 year). Less reliable for businesses with seasonality, multi-product mixes that shift over time, or early-stage startups whose cost base is still expanding.
Reviewed according to the CalcDomain Editorial Policy & Calculator Methodology. We document formulas, edge cases, sources, update dates, and correction paths for calculator pages.
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