How to Calculate Your Break-Even Point (Free Tool)

To calculate your break-even point, divide total fixed costs by the contribution margin per unit — the selling price minus the variable cost per unit — and the result is how many units you must sell to cover every cost. The ByteTools Break-Even Calculator does this instantly from three inputs and also shows the revenue at that point, all computed privately in your browser.

This guide walks through exactly what to enter, how to read the results, and a worked example, so a first-time user can go from cost figures to a clear sales target in under a minute.

What the tool does

You provide three numbers: total fixed costs (rent, salaries, software — costs that do not change with volume), the selling price per unit, and the variable cost per unit (materials, shipping, per-sale fees). The calculator returns three things: the break-even quantity in whole units, the break-even revenue, and the contribution margin per unit. Above the break-even quantity you make a profit; below it, a loss.

Step-by-step

1. Choose your currency and enter total fixed costs for the period you care about — typically a month or a year.
2. Enter the selling price per unit — what the customer actually pays for one item.
3. Enter the variable cost per unit — everything it costs to produce and deliver that one item.
4. Read the results: break-even units, break-even revenue and contribution margin update live, with no calculate button.

Because break-even units are rounded up to the next whole unit — you cannot sell a fraction and still fully cover costs — selling that many or more guarantees revenue meets or exceeds total cost.

A worked example

Input	Value
Fixed costs	$6,000
Price per unit	$40
Variable cost per unit	$25
Contribution margin	$15
Break-even units	400
Break-even revenue	$16,000

Here the contribution margin is $40 − $25 = $15. Dividing $6,000 in fixed costs by $15 gives 400 units, and 400 × $40 is $16,000 in revenue. Sell the 401st unit and you begin to profit. Change any input — say you raise the price to $45 — and the tool instantly re-solves (break-even drops to 300 units), letting you test pricing scenarios in real time.

Everything stays in your browser

Your cost and pricing figures are commercially sensitive, so the calculator runs entirely client-side. Nothing is uploaded or saved, which means you can model a new product or a competitor-facing price without any data leaving your device. The tool also warns you if price does not exceed variable cost — in that case every sale loses money and no break-even point exists, prompting you to raise price or cut cost. Results are planning estimates, not financial advice.

Try the Break-Even Calculator — free and 100% in your browser.

FAQ

What three numbers do I need to find break-even?

Total fixed costs, selling price per unit, and variable cost per unit. From those the tool derives contribution margin, break-even units and break-even revenue automatically.

What period should my fixed costs cover?

Match them to the horizon you are planning — monthly fixed costs give a monthly break-even, annual costs give an annual one. Just keep price and variable cost consistent with that same period.

Why does the tool round units up?

You cannot sell part of a unit and still cover all costs, so it rounds to the next whole unit. Reaching that count or higher ensures total revenue meets or exceeds total costs.

Is my pricing data sent anywhere?

No. The entire calculation happens in your browser with nothing uploaded or stored, so your figures stay private while you model different scenarios.

Related free tools

• Margin & Markup Calculator — set a price that hits your target margin.
• ROI Calculator — measure the return on an investment.
• Percentage Calculator — quick percentage math for pricing.
• Loan Calculator — plan financing for startup costs.

Built by ByteVancer

ByteTools is a free product of ByteVancer, a software and web development studio building web apps, SaaS and custom software. Need a custom financial model or internal tool for your business? Explore what ByteVancer can build.