Break-Even Calculator: Units Needed to Cover Fixed Costs
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.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Break-even units |
|---|---|
| $50k fixed · $40 margin | 1,250 |
| $120k fixed · $75 margin | 1,600 |
| $20k fixed · $12 margin | 1,666.67 |
| $300k fixed · $250 margin | 1,200 |
How This Calculator Works
Enter the total fixed costs and the contribution margin per unit — the selling price of one unit minus its variable cost. The calculator divides fixed costs by the contribution margin to find the number of units that must be sold before the business breaks even.
The Formula
Recovery Period
Fixed Cost is the upfront amount, Benefit per Period is the recurring gain that pays it back
Worked Example
A business with $50,000 of fixed costs and a $40 contribution margin per unit breaks even at 1,250 units. Every unit beyond that adds $40 of profit; every unit short of it leaves part of the fixed costs uncovered.
Key Insight
The break-even point is most sensitive to the contribution margin. Raising the price or cutting the variable cost per unit lowers the units needed far more effectively than trimming fixed costs by the same percentage.
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.
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.
Frequently Asked Questions
What is the break-even point?
It is the sales volume at which total revenue exactly covers total costs. Below it the business makes a loss; above it, every sale contributes profit.
What is the contribution margin per unit?
It is the selling price of one unit minus the variable cost of producing it. That margin is what each unit contributes toward fixed costs and then profit.
What counts as a fixed cost?
Costs that do not change with how much you sell — rent, salaries, insurance, and similar overheads. Costs that rise with volume are variable, not fixed.
How do I lower my break-even point?
Raise the price, cut the variable cost per unit, or reduce fixed costs. The first two lift the contribution margin and usually move the break-even point the most.
Does break-even mean the business is healthy?
Not on its own. It shows the survival threshold; a healthy business needs to sell well beyond break-even to fund growth and absorb setbacks.
When is this calculator unreliable?
It is unreliable when fixed costs change with volume (capacity step-ups), when product mix is shifting (each product has a different contribution margin), or when the time horizon is long enough that prices, wages, or input costs are likely to drift. For seasonal businesses, compute break-even for the relevant season rather than annualised numbers, and refresh the calculation when any input assumption moves by more than ±10%.
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
This calculator draws on 2 independent, dated sources.
Methodology & Review
The break-even point in units equals fixed costs divided by the contribution margin per unit, where contribution margin = unit selling price − unit variable cost. Sales above the break-even point produce profit; sales below it produce a loss. The calculator assumes a single product (or a stable product mix), constant unit price and constant variable cost over the relevant range, and a linear cost structure with no step changes in fixed cost. Real businesses often violate these assumptions — for example, fixed costs jump when capacity is added (a new shift, a second machine, an additional sales rep) or unit costs vary with volume discounts. 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 for early-stage startups whose cost base is still expanding.
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