Break-Even Calculator
A break-even calculator is a tool that finds the point where total revenue exactly equals total cost, so profit is zero — the moment a product stops losing money and starts making it. It works from three inputs: your fixed costs, the selling price per unit, and the variable cost per unit. The contribution margin (price minus variable cost) is what each sale contributes toward covering fixed costs, and dividing fixed costs by that margin gives the units you must sell to break even. This tool also solves the units needed to reach a target profit. It is a simplified single-product estimate, not financial advice, and runs entirely in your browser.
Use cases
Price a new product before launch
Before you set a price, you can test how each option changes the break-even point. Raising the price lifts the contribution margin and lowers the units you must sell, while a lower price does the opposite. Entering a few candidate prices side by side turns an abstract pricing decision into a concrete sales target you can weigh against realistic demand.
Judge whether a fixed-cost increase is worth it
Signing a bigger lease, hiring staff, or buying equipment all raise fixed costs, which pushes the break-even point higher. By entering the new fixed-cost figure you can see exactly how many additional units you would need to sell to justify the commitment, making it easier to decide whether the extra capacity will actually pay for itself.
Set a sales target for a profit goal
Breaking even is the floor, not the goal. Enter a target profit and the calculator adds it to your fixed costs before dividing by the contribution margin, showing the units and revenue required to earn that amount. That gives your team a clear, math-backed number to aim for rather than a vague hope of profitability.
Compare the impact of variable costs
Materials, packaging, payment fees, and shipping all feed into the variable cost per unit, and each one eats into your contribution margin. By adjusting the variable cost you can see how a cheaper supplier or a rise in fees shifts the break-even point, which helps you focus any cost-cutting effort where it moves the number the most.
Sanity-check a side project or small business
For a small shop or side project, the break-even point answers the first question anyone should ask: how much must I sell just to cover costs? Seeing that number early keeps expectations realistic and highlights whether the idea can plausibly clear its costs at the volume you can actually reach, before you invest more time or money.
How it works
- Enter your fixed costs — Add every cost that does not change with volume — rent, salaries, insurance, subscriptions — as a single total for the period you are analysing.
- Enter the price per unit — Type the amount you charge a customer for one unit of the product or service.
- Enter the variable cost per unit — Add what each unit costs you to make and sell — materials, packaging, and per-sale fees — so the tool can compute the contribution margin.
- Add a target profit (optional) — If you want more than break-even, enter the profit you are aiming for and the tool folds it into the calculation.
- Read the break-even results — The calculator shows the contribution margin, the units to break even, the matching sales revenue, and the units needed for your target profit.
Examples
Input: Fixed $10,000; price $50; variable cost $30
Output: Break-even: 500 units = $25,000 revenue
Input: Same figures, target profit $4,000
Output: Need 700 units = $35,000 revenue
Input: Price cut to $40, variable cost still $30
Output: Break-even rises to 1,000 units
Frequently asked questions
What is the break-even point?
It is the sales level where total revenue equals total cost, so profit is exactly zero. Below it you lose money; above it you start to profit. It is usually expressed in units and in the sales revenue those units represent.
What is contribution margin?
Contribution margin is the selling price per unit minus the variable cost per unit — the money each sale contributes toward covering fixed costs. Once fixed costs are fully covered, each additional unit’s contribution margin becomes profit.
How do I find units for a target profit?
Add the target profit to your fixed costs, then divide by the contribution margin per unit. This tool does that automatically the moment you enter a target profit alongside your other figures.
What does this calculator NOT account for?
It is a simplified single-product model. It assumes a constant price and constant costs, and it ignores taxes, financing and interest, step-fixed costs that jump at higher volumes, and the mix of multiple products. Treat the result as an estimate.
Can I use it for a service business?
Yes. Treat one billable unit — an hour, a session, or a project — as the ‘unit’, with its own price and its own variable cost. The same fixed-cost-divided-by-margin logic applies to services just as it does to physical products.
Why did my break-even point go up?
Either fixed costs rose, the price fell, or the variable cost rose. Each of those either increases the total you have to cover or shrinks the contribution margin per unit, so more units are needed to reach zero profit.
Is this financial advice?
No. It is an educational estimate to help you reason about pricing and volume. For decisions with real financial stakes, confirm the numbers with an accountant or a qualified financial professional.
Tips
- Use costs and revenue from the same period — a month, quarter, or year — so the break-even figure is meaningful.
- Keep variable and fixed costs cleanly separated; misclassifying one distorts both the margin and the result.
- Include per-sale fees such as payment processing and commissions in the variable cost, not the fixed cost.
- Test a range of prices to see how sensitive your break-even point is to each one.
- Round the resulting units up — you cannot break even on a fraction of a unit.
Try it now
The full Break-Even Calculator runs in your browser at https://ztools.zaions.com/break-even-calculator — no signup, no upload, no data leaves your device.
Last updated: 2026-07-08 · Author: Ahsan Mahmood · Edit this page on GitHub