Break-Even Calculator

How this is calculated

The contribution margin is the price of one unit minus the variable cost of making or delivering that unit. It is what a single sale contributes toward your fixed costs, and it is the number the whole calculation turns on. Break-even units is fixed costs divided by that margin, rounded UP - you cannot sell most of a unit, and the fraction you are short still leaves you short. FIXED costs are the ones that happen whether you sell anything or not: rent, salaries, software, insurance, the loan repayment. VARIABLE costs scale with each sale: materials, packaging, shipping, payment processing, commission. Getting a cost into the wrong bucket is the most common way this calculation goes wrong, and the direction matters - treating a fixed cost as variable understates your break-even, which is the dangerous direction. ⚠️ PRICE IS NOT MARGIN. Doubling your price from 25 to 50 with variable costs of 9 does not double what each sale contributes - it takes the margin from 16 to 41, which is more than double. Conversely, a 10 percent discount on a 25 dollar product with 9 dollars of variable cost cuts the margin from 16 to 13.50, a 16 percent fall. Small price movements swing the margin hard, and the margin is what pays the rent. That is also why discounting is more expensive than it looks, and why the same discount is far more damaging on a low-margin product than a high-margin one. This is a single-product model. A business with several products has a blended margin that shifts with the sales mix, so selling more of your low-margin line moves your break-even upward even when revenue is rising. If your products differ substantially in margin, run each separately and treat this as a per-line figure. Also not included: tax, any step-change in fixed costs as you grow into a bigger space or another hire, and the fact that variable costs often fall with volume. Break-even is a snapshot at today's costs, not a forecast.

Common questions

Why does it show a dash?

Because your variable cost is at or above your price, so every sale loses money and no number of them reaches break-even. There is no answer to display, and printing a very large number would suggest there is one. This is worth taking seriously rather than treating as a rounding problem - a business in this position gets further from profitability with every order, and selling more makes it worse.

What counts as fixed and what as variable?

Fixed costs happen whether you sell anything or not - rent, salaries, software subscriptions, insurance, loan repayments. Variable costs only happen when you sell - materials, packaging, shipping, payment processing fees, sales commission. Getting one into the wrong bucket is the most common error here, and the direction matters: treating a fixed cost as variable understates your break-even, which is the dangerous way to be wrong.

Why is break-even revenue higher than my fixed costs?

Because the revenue has to cover the variable costs as well. At 4,000 dollars of fixed costs with a 16 dollar margin on a 25 dollar product, you need 250 units - which is 6,250 dollars of revenue, not 4,000. The extra 2,250 went straight out again on making the 250 units. Revenue is not the same as money you keep, and confusing the two is how a busy month can still lose money.

How much does a discount really cost?

Far more than the discount. A 10 percent price cut on a 25 dollar product with 9 dollars of variable cost drops the margin from 16 to 13.50 - a 16 percent fall in what each sale contributes. Your break-even jumps from 250 units to 297, so you need almost a fifth more sales just to stand still. The lower your margin, the worse this gets: on a thin-margin product a modest discount can move break-even by half.

I sell several products. Does this work?

Only per line. A multi-product business has a blended margin that shifts with the sales mix, which means selling more of your low-margin line pushes break-even UP even while revenue rises - a genuinely counterintuitive effect that catches people out during a good month. Run each product separately, and if the mix moves much, recalculate rather than assuming last quarter's blend.

What is the units-per-day figure for?

Sanity. A break-even of 250 units a month is an abstraction; 8.3 units a day is something you can compare against what actually happens on a Tuesday. If that number is well beyond anything you have achieved, the problem is not effort - it is the price, the variable cost, or the fixed cost base, and no amount of selling harder will fix it.

Take it further with AI

Copy this into ChatGPT or Claude with your own numbers filled in. It hands over the figures this calculator worked out, so the answer is built on real arithmetic instead of a guess.

I used the Break-Even Calculator at https://www.bfcbrilliance.com/tools/break-even-calculator.

What I entered:
- Fixed costs for the period ($): ___
- Price per unit ($): ___
- Variable cost per unit ($): ___
- Days in the period (days): ___

What it calculated:
- Units to break even: ___
- Contribution margin per unit: ___
- Margin as a share of price: ___
- Revenue at break-even: ___
- Units per day needed: ___

Use those figures as given — they are already worked out, so please don't recalculate or estimate your own. Help me turn them into a plan: what to buy or do, in what order, roughly what it should cost, and the mistakes people most often make with this job.

Keep this general and do not give financial advice — flag where I should talk to a qualified adviser.

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