Free small business tool
Free Break-Even Calculator
Calculate contribution margin, break-even units, and break-even revenue from fixed costs, price, and variable cost per unit.
- No account required
- Runs locally in your browser
- Educational result
Free in-browser calculator
Calculate your break-even point
Use values from the same time period and one consistent unit or service.
Your entries stay in your browser. Financial values are not stored or sent to Small Tool Guides or Google Analytics.
Your result
Calculation summary
- Contribution Margin per Unit
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- Contribution Margin
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- Break-Even Units
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- Break-Even Revenue
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Educational calculation only. Verify inputs, definitions, timing, taxes, and other material costs before making an important business decision.
How this calculator works
Understand the method, assumptions, and limits
Review the formula, define each input consistently, and treat the result as an educational starting point rather than financial advice.
What is break-even?
Break-even is the point at which the revenue in the model covers the fixed and variable costs included in that same model. The result is neither a profit target nor a sales forecast. It is a threshold built from specific assumptions.
This calculator uses a single-product or single-service-unit model. It first finds how much each unit contributes after its variable cost, then determines how many whole units are needed to cover fixed costs.
Fixed vs. variable costs
Fixed costs are included costs that do not change directly with every unit sold during the chosen period, such as an applicable lease or base software subscription. Variable costs change with each unit or service, such as included materials, per-order packaging, or a unit-based fee.
Real costs can be mixed. A service may have a base charge plus usage fees; labor may be fixed within one capacity range and change when overtime or another employee is required. Split mixed costs deliberately or document the simplification.
Contribution margin explained
Contribution margin per unit is selling price minus variable cost per unit. It is the amount from each unit available to cover fixed costs and, after those costs are covered, contribute to profit within this model.
Contribution margin percentage expresses that amount as a share of selling price. It is not the same as company net profit margin.
How break-even is calculated
Contribution per Unit = Selling Price − Variable Cost per Unit
Contribution Margin (%) = Contribution per Unit ÷ Selling Price × 100
Break-Even Units = Fixed Costs ÷ Contribution per Unit
Break-Even Revenue = Rounded-Up Break-Even Units × Selling Price
Units are rounded up because a whole additional physical unit is normally required to cover any remaining amount. For divisible services, the exact unrounded threshold may be useful, but the calculator intentionally reports the conservative whole-unit requirement.
Worked example
Hypothetical example: Fixed costs are $5,000, selling price is $50 per unit, and variable cost is $30 per unit.
Contribution per unit: $50 − $30 = $20
Contribution margin: $20 ÷ $50 × 100 = 40%
Break-even units: $5,000 ÷ $20 = 250 units
Break-even revenue: 250 × $50 = $12,500
How to interpret your break-even point
Compare the required units with realistic capacity and demand for the same period. If the calculation requires 250 units per month, ask whether production, staffing, fulfillment, and customer demand can support that volume. Then test alternative prices, costs, and fixed-cost structures without treating any scenario as a prediction.
The U.S. Small Business Administration describes break-even as the point where total cost and total revenue are equal and publishes the same units formula in its official break-even guidance.
What break-even does not tell you
Break-even does not prove that the sales volume is achievable, that the price is acceptable to customers, or that the business has sufficient cash. It does not automatically include taxes, payment timing, financing, inventory commitments, discounts, returns, changing costs, multiple product mixes, capacity steps, or owner compensation.
For several products with different contribution margins, a weighted sales-mix analysis may be required. Qualified accounting or financial help may be appropriate when the result informs a consequential commitment.
Common break-even mistakes
- Mixing monthly fixed costs with annual sales assumptions.
- Leaving per-unit payment, shipping, fulfillment, or return costs outside variable cost without noting the omission.
- Using revenue instead of contribution to cover fixed costs.
- Forgetting that cost or price can change at higher volume.
- Treating the break-even threshold as a demand forecast or profit goal.
- Combining products with different economics as though every unit were equivalent.
Frequently Asked Questions
Why are break-even units rounded up?
When units are physical or indivisible, selling a fraction of a unit cannot cover the remaining cost. The calculator rounds up to the next whole unit required to meet or exceed the included break-even amount.
What if selling price is equal to or below variable cost?
Each additional unit contributes nothing or creates a loss, so this single-product formula cannot produce a finite break-even point. The calculator explains the issue instead of showing Infinity.
Can I use monthly fixed costs?
Yes. Keep every input in the same period. Monthly fixed costs produce a monthly break-even point; annual fixed costs produce an annual result.
Does break-even mean the business has enough cash?
Not necessarily. This simplified model does not capture payment timing, financing, taxes, inventory purchases, capital spending, or every cash-flow requirement.