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Break-Even Units Calculator
How many units do you need to sell before the business stops losing money? Enter your fixed costs, price, and per-unit variable costs — get the exact break-even quantity, revenue, and how much cushion you have if sales fall short.
How the math works
The number that tells you if your business works
Break-even analysis answers one question: how many units must I sell before total profit crosses zero? It is the single most important number in deciding whether a product, a price, or an entire business is viable — and it is the number most sellers skip before placing inventory orders.
The core formula
Every unit you sell contributes a slice of money toward covering fixed costs. That slice — the contribution margin per unit — is what is left after all variable costs are deducted from the price:
Fixed costs are everything that does not change with volume: subscriptions, rent, salaries, committed ad budgets. Divide total fixed costs by contribution per unit and you get the exact quantity at which the business stops losing money:
Why contribution margin, not gross margin
Gross margin (price minus product cost) ignores fees, shipping, and ad spend — the three line items that eat most of the remaining profit. A product with a 70% gross margin can have a 25% contribution margin after Amazon's 15% referral, $5 fulfillment, $3.50 shipping, and $4 in ad cost. Break-even computed on gross margin will tell you a comforting lie; break-even on contribution margin tells you the truth.
Margin of safety: your risk buffer
If you project 200 units/month and break-even is 150, your margin of safety is 25% — you can lose a quarter of expected sales and still not lose money. Below 15% is a red flag: any miss in demand, any fee increase, any ad cost spike pushes you underwater. Above 30% means you have room to experiment with pricing or ad spend without existential risk.
The price lever
Price is the most powerful break-even lever because it changes contribution margin on every unit simultaneously. Raising price from $30 to $34 on a product with $16 in variable costs increases contribution from $14 to $18 — a 29% improvement that can drop break-even by 50+ units. The trade-off is demand: a higher price may shrink the customer pool. Use the calculator to model the break-even at different price points, then ask the harder question — can I still sell that many at this price?
Ad spend: fixed or variable?
This is the most common confusion in break-even math. If you run a fixed monthly ad budget ("$2,000 on Facebook regardless of outcome"), it is a fixed cost — it does not change with units sold. If you pay a known cost-per-acquisition ("$4 per order from branded search"), it is a variable cost that reduces contribution per unit. Real businesses often have both: a fixed base for awareness, plus per-unit CAC for conversion. Put the base in fixed costs and the per-unit portion in the ad-cost field — the calculator handles the rest.
What break-even cannot tell you
Break-even tells you the quantity needed, not whether you can achieve it. It is a necessary but not sufficient test. Pair it with the ROAS break-even calculator to check whether your ad efficiency can deliver the traffic, and with the discount pricing calculator to see how promotions shift the break-even line. Together, the three tools answer the pricing-advertising-volume triangle that every product launch must solve.
Questions
Break-even calculator FAQ
What is the break-even point in units?
The break-even point is the number of units you must sell for total contribution margin to exactly equal total fixed costs. At that quantity, profit is zero — every unit sold above it adds profit at the full contribution margin per unit. The formula is: break-even units = fixed costs ÷ contribution margin per unit.
How do I calculate contribution margin per unit?
Contribution margin per unit = selling price − all variable costs per unit. Variable costs include product cost, platform fees, payment processing, shipping you pay, packaging, and any per-unit ad spend you want to attribute. It does not include fixed costs like subscriptions, salaries, or inventory you already committed to — those are covered by the contribution margin, not part of it.
Should ad spend be in fixed costs or variable costs?
It depends on how you buy ads. If you have a set monthly ad budget (e.g., $2,000 on Facebook ads regardless of volume), treat it as a fixed cost. If you pay per-unit acquisition (e.g., $5 CAC per order), treat it as a variable cost that reduces contribution margin per unit. Mixing the two — a fixed base plus per-order acquisition — is the most realistic model: put the base in fixed costs and the per-unit portion in variable costs.
What is margin of safety?
Margin of safety is how far your actual (or projected) sales sit above the break-even point, expressed as a percentage. If you expect to sell 1,000 units and break-even is 600, your margin of safety is 40% — you can lose 40% of expected sales before hitting zero profit. A margin of safety below 15% is risky; above 30% is comfortable.
How does price affect break-even?
Raising price increases contribution margin per unit, which lowers the break-even quantity — but it can also reduce demand. The practical use is sensitivity analysis: if raising price from $30 to $34 drops your break-even from 500 to 400 units, ask whether the higher price will still attract at least 400 buyers. The calculator lets you adjust price live to see the break-even shift instantly.
What fixed costs should I include?
Include all costs that do not change with sales volume: monthly subscriptions (Shopify plan, software tools), rent or storage fees, salaries and contractor retainers, insurance, and any committed ad budget. Do not include one-time setup costs (already spent) or inventory purchase (that is captured in variable cost per unit, not fixed). If a cost scales with sales, it is variable, not fixed.
Keep calculating
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