How to find your break-even point

Break-even is the point where revenue exactly covers cost — below it you’re losing money on every sale, above it you’re making it. Most new businesses mis-price because they don’t know their break-even volume, and most products get launched at margins that make scaling impossible. This guide walks through the formula, the cost categories you have to separate correctly, and the three questions the break-even number answers immediately.

The formula in plain language

Break-even units = Fixed costs / (Price per unit − Variable cost per unit)

The denominator — price minus variable cost — is called the contribution margin. It’s the dollars each sale contributes toward covering your fixed costs.

Example: You sell a subscription at $29/month. Your variable cost per customer per month (hosting, payment processing, CS minutes) is $6. Contribution margin = $23/month per customer. Fixed costs (salaries, rent, software) are $50,000/month. Break-even = 50,000 / 23 ≈ 2,174 paying customers.

That number answers a question strategy decks usually don’t: “How many customers do we need just to not lose money?” If it’s far larger than your realistic 12-month sales target, your unit economics or cost base are broken.

Step 1 — classify costs correctly

Most founders put costs in the wrong bucket and get a useless answer. The clean rule:

Fixed costs are costs that don’t move with the next sale. Rent, salaries, accounting retainer, insurance, most software subscriptions. Constant whether you sell 10 or 1,000.

Variable costs move with every unit you sell. Cost of goods sold (COGS), shipping, payment processing fees (2.9% + $0.30), direct labor per unit, commissions per sale.

Trap: marketing spend is usually variable-ish (step-function), not truly fixed. If break-even is sensitive to marketing, model it as a cost per acquisition rather than a line item.

Step 2 — find your actual unit price

“Price” on the invoice is usually not the price you keep. Subtract:

Discounts. If 30% of orders use a 20% discount code, effective price is 6% lower than sticker.

Returns and refunds. 8–15% typical for ecommerce. Subtract proportionally.

Payment processing. ~3% on cards.

Platform fees. 15–30% on marketplaces (Amazon, App Store, Etsy).

A product with a $100 MSRP sold through Amazon (15% fee) with 10% average discounts and 10% returns might net you $72 — and that’s the number that goes into break-even math.

Step 3 — run the math three ways

Break-even units (answered above): how many sales to cover costs.

Break-even revenue = Fixed costs / Contribution margin ratio, where ratio = (Price − Variable cost) / Price. For the subscription example: 50,000 / (23/29) = 50,000 / 0.793 ≈ $63,070/month in revenue.

Break-even price (given a target volume): At 1,000 customers, what price makes you break even? 50,000 / 1,000 + 6 = $56/month. Anything below that and you lose money.

The three decisions break-even unlocks

(1) Should we launch this product? If break-even volume is 10× your realistic year-1 sales forecast, the economics don’t work. Either price is too low, cost is too high, or you’re chasing a market too small for your cost base.

(2) Can we absorb a discount promotion? A 20% discount cuts contribution margin by more than 20% (because fixed costs don’t move). If CM drops below fixed-cost coverage at your current volume, the promotion loses money even if it ships more units.

(3) Can we afford this new hire? A $120k engineer adds $10k/month to fixed costs. At $23 CM per subscription, you need 435 more paying customers just to neutralize. Does the hire create that incremental demand? If not, the hire deepens your hole.

Multi-product break-even (weighted average)

If you sell multiple products with different contribution margins, use a weighted average CM based on sales mix:

Product A: 60% of sales, $20 CM. Product B: 40% of sales, $35 CM. Weighted CM = (0.60 × 20) + (0.40 × 35) = $26. Break-even = Fixed costs / $26.

Important: if sales mix shifts toward lower-CM products, break-even volume rises even at the same total revenue. This is why SaaS businesses monitor average revenue per account (ARPA) — a lower ARPA at the same customer count means the break-even point moved up.

Time-to-break-even (the other break-even)

For a business with upfront investment — inventory, software build, marketing blitz — break-even has a time dimension: how many months until cumulative profit covers the upfront cost?

Month 1: −$100k (launch costs). Monthly CM × 200 customers = $5,000/month profit after fixed costs. Time to break-even: 20 months.

Critical test: does your cash runway last that long? If the startup runway calculator says you have 14 months of cash and break-even takes 20, you need to either reduce launch costs, raise more, grow faster, or kill the product before you’re forced to.

Break-even in service businesses

Services replace “units” with “billable hours” or “clients.” A consulting firm with $30k/month fixed costs and a $150/hour rate (80% billable after cost-of-delivery) needs $30,000 / $120 = 250 billable hours/month to break even. At 30 billable hrs/week per consultant, that’s ~2 full-time consultants billing full weeks.

Service-business break-even collapses fast when utilization drops — which is why agency burn looks sharp during slow months.

Break-even sensitivity — the real question

A single break-even number is less useful than a sensitivity table. Vary each input ±20% and see how break-even moves:

Price −10%: break-even volume typically jumps 20–40% because CM shrinks faster than price.

Variable cost +10%: similar hit to CM, similar jump in break-even volume.

Fixed cost +10%: break-even volume rises proportionally.

The inputs with the biggest leverage are price and variable cost, because they affect every unit. Focus optimization there first.

Run the numbers

Plug your fixed costs, price, and variable cost into the break-even calculator for units, revenue, and price views. Pair with the profit margin calculator for the “is CM healthy” check, and the startup runway calculator to see whether your cash lasts long enough to reach break-even.