Break-Even Point Calculator
Find the exact number of units you must sell before total revenue covers total costs and the next sale becomes pure profit. Essential for product pricing, startup planning, and deciding whether a product line is viable.
About this calculator
The break-even point is the unit volume at which total revenue exactly equals total cost — neither profit nor loss. The formula is: Break-Even Units = Fixed Costs / (Price per Unit − Variable Cost per Unit). The denominator (Price − Variable Cost) is the Contribution Margin per Unit — the dollars each sale contributes to covering fixed costs once variable costs are paid. Variables: Fixed Costs are expenses that do not change with output in the relevant range (rent, salaried staff, equipment leases, insurance); Variable Costs change one-for-one with each unit produced (materials, packaging, sales commissions, payment-processing fees, shipping). Edge cases: if Price ≤ Variable Cost the contribution margin is zero or negative and the break-even point is undefined or infinite — every additional sale increases the loss, so the only fix is raising price or cutting variable cost. The model assumes constant price and constant variable cost across the entire volume range, which breaks down once volume discounts, capacity steps, or pricing tiers kick in. It also assumes a single product or a stable sales mix; multi-product break-even requires a weighted-average contribution margin and a fixed mix assumption.
How to use
Example 1 — Candle business. Monthly fixed costs (rent + equipment lease) total $3,000. Each candle sells for $25 with $10 in variable cost (wax, wick, jar, packaging). Enter 3000, 25, and 10. Step 1: contribution margin = 25 − 10 = $15 per candle. Step 2: 3,000 / 15 = 200. Result: 200 candles per month. Verify: 200 × $25 = $5,000 revenue; 200 × $10 = $2,000 variable cost; $5,000 − $2,000 − $3,000 fixed = $0 ✓. Selling the 201st candle earns a clean $15 profit. Example 2 — SaaS micro-business. Fixed costs are $4,500/month (hosting + part-time engineer). Each subscription is $49/month with $4 in variable cost (Stripe fees, transactional email). Enter 4500, 49, 4. Step 1: contribution margin = 49 − 4 = $45. Step 2: 4,500 / 45 = 100. Result: 100 paying customers. Verify: 100 × $49 = $4,900 revenue; 100 × $4 = $400 variable cost; $4,900 − $400 − $4,500 = $0 ✓. Knowing the answer is 100 customers — not 50 or 200 — turns "we need more users" into a concrete acquisition target.
Frequently asked questions
What is the difference between break-even units and break-even revenue?
Break-even units = Fixed Costs / Contribution Margin per Unit answers "how many to sell." Break-even revenue = Fixed Costs / Contribution Margin Ratio answers "how many dollars," where the Contribution Margin Ratio = (Price − Variable Cost) / Price. The two are equivalent for a single product (just multiply break-even units by price), but break-even revenue is the more useful framing for multi-product businesses, since aggregating units across products with different prices is meaningless. Service businesses with no discrete "unit" also use the revenue form. For a coffee shop selling drinks, food, and merchandise at very different price points, compute one weighted Contribution Margin Ratio and divide fixed costs by it to get total break-even revenue.
How does discounting or a price drop affect the break-even point?
Lowering price shrinks contribution margin much more than it shrinks the headline price, because variable cost stays the same. If price drops from $25 to $20 with variable cost at $10, contribution margin falls from $15 to $10 (a 33% cut), and break-even units jump from 200 to 300 (a 50% increase). For a 20% discount to be profit-neutral you would need volume to rise by 50% just to break even at the new price — rarely realistic. This is why "discount to grow volume" strategies often destroy operating profit: the elasticity required is much higher than intuition suggests. Run the break-even math before approving any promotion to see exactly how much extra volume the discount demands.
What are the most common mistakes in break-even analysis?
The biggest is misclassifying costs — treating semi-variable costs (utilities, part-time labour, payment processing) as either fully fixed or fully variable distorts the contribution margin. The second is using accounting depreciation as a fixed cost: it is non-cash, so for cash-based break-even it should be excluded. The third is ignoring the relevant range — break-even math assumes linear behaviour, but at higher volumes you may need a second shift, a bigger warehouse, or step changes in management overhead that move the fixed-cost line. The fourth is using list price instead of average net realised price after discounts and returns. Finally, multi-product businesses often plug in a single average contribution margin without weighting by sales mix, which produces a number that is mathematically clean but operationally meaningless.
When should I NOT use a break-even analysis?
Skip break-even for businesses where the cost structure is dominated by step changes — software platforms where capacity is added in big chunks, hospitals where additional patient volume requires hiring a whole new team, or any business where the next sale forces a fixed-cost increase. The linear assumption breaks down in those settings. Avoid it for service businesses with no clear unit of output, or use the revenue form with caution. Do not use it for strategic decisions where intangible value (brand, market entry, talent retention) outweighs immediate profitability — these often justify operating below break-even for an extended ramp. And do not confuse break-even with profit goals: break-even is the floor, not the target; the price-volume combination that maximises profit is usually well above the break-even point.
How do margin of safety and operating leverage relate to break-even?
Margin of Safety = (Actual Sales − Break-Even Sales) / Actual Sales — the percentage by which sales could fall before the business starts losing money. A 30% margin of safety means revenue could drop 30% before profit goes negative; below 10% the business is fragile. Operating leverage = Contribution Margin / Operating Income — it measures how much a 1% change in sales moves operating profit. High operating leverage (low variable cost, high fixed cost) means profit swings dramatically with sales: great in growth, brutal in downturns. Together, the three numbers (break-even, margin of safety, operating leverage) form a complete picture of operating risk. Track them quarterly and re-run break-even whenever fixed costs change materially.