What is the break-even point formula?

Break-even units = Fixed costs ÷ (Price per unit − Variable cost per unit). The denominator is the contribution margin — what each sale adds toward covering fixed costs. In revenue dollars: Fixed costs ÷ contribution margin ratio.

What is contribution margin?

The amount each unit sale contributes toward fixed costs and profit: selling price minus variable cost per unit. A $5 coffee with $1.50 of beans, cup and milk has a $3.50 contribution margin (70%).

What is a good margin of safety?

Margin of safety = (actual sales − break-even sales) ÷ actual sales. Above 20–30% is generally comfortable; below 10% means a modest demand dip pushes you into losses.

How do I calculate break-even with a target profit?

Add the target profit to fixed costs: Units = (Fixed costs + Target profit) ÷ contribution margin. To earn $2,000 with $4,000 fixed costs and $3.50 margin: (4,000 + 2,000) ÷ 3.50 ≈ 1,715 units.

Does break-even analysis work for service businesses?

Yes — define the 'unit' as a billable hour, project or client. Fixed costs are rent, software and salaries; variable costs are per-job materials, contractor fees and payment processing.

Break-Even Analysis — Formula, Margin of Safety & Worked Example

Quick answer: Break-even units = Fixed costs ÷ (Price − Variable cost per unit). Every sale above that point earns profit equal to its contribution margin; every sale below it digs the hole deeper. The break-even calculator returns this instantly with charts.

Break-even is the first number every small business should know — and the one most often guessed. It answers "how much do I need to sell to stop losing money?" and, with one extension, "how much to hit my target income?"

The two cost categories (get these right first)

Mixed costs (a phone plan with a base plus per-GB charges) split into their fixed base and variable per-unit part. Misclassifying these is the #1 source of wrong break-even numbers.

The formulas

Contribution margin (CM) = Price − Variable cost per unit
Break-even units = Fixed costs ÷ CM
Break-even revenue = Fixed costs ÷ (CM ÷ Price)
Target-profit units = (Fixed costs + Target profit) ÷ CM

Worked example: a small café

Monthly fixed costs: rent $2,400 + utilities $400 + insurance $250 + base staff $950 = $4,000. Average ticket: $5.00 coffee + pastry; variable cost per ticket (beans, milk, cup, food cost, fees): $1.50.

Target profit $2,000/month → (4,000 + 2,000) ÷ 3.50 = 1,715 tickets (≈ $286/day).

Margin of safety: how close to the cliff are you?

Margin of safety = (Actual sales − Break-even sales) ÷ Actual sales

If the café averages $8,000/month: (8,000 − 5,714) ÷ 8,000 = 28.6% — demand can fall by that much before losses start. Under 10% is a warning sign: one slow season or a new competitor wipes out the profit.

What the analysis teaches (levers to pull)

Move	Effect on break-even
Raise price $0.50 (CM → $4.00)	4,000 ÷ 4.00 = 1,000 tickets (−143)
Cut variable cost $0.25 (CM → $3.75)	4,000 ÷ 3.75 ≈ 1,067 (−76)
Cut fixed costs $500	3,500 ÷ 3.50 = 1,000 (−143)

Small margin improvements compound quickly — a 10% price increase typically moves break-even far more than a 10% sales increase would.

Frequently Asked Questions

Is break-even analysis useful for startups with no sales history?

That's exactly when it matters most — it converts a business plan into a daily sales target before money is committed. Use conservative price and cost estimates, then re-run monthly with real data.

What if I sell many products at different margins?

Use a weighted-average CM based on your sales mix, or run the analysis per product line. A gym's break-even blending $900 memberships with $40 day passes needs the mix assumption explicit.

Does break-even include owner salary?

Only if you put it in fixed costs. For a true picture, include the salary you need to survive — otherwise you've calculated break-even for the business, not for you.

What's the difference between break-even and payback period?

Break-even is per-period (usually monthly) operating coverage. Payback period asks how long an upfront investment takes to recover from cumulative cash flows — related, different question.

Break-Even Analysis: How Many Sales Before You Make Money?