Quick answer
Break-Even Units = Fixed Costs ÷ Contribution Margin per Unit. Example: $50,000 fixed costs, $100 selling price, $60 variable cost → CM = $40, break-even = 1,250 units or $125,000 revenue.
How to use this break-even calculator
Enter your Total Fixed Costs (costs that don't change with volume: rent, salaries, insurance), the Selling Price per Unit, and the Variable Cost per Unit (costs that scale with production: materials, direct labour, packaging). The calculator instantly shows break-even in units and revenue, plus contribution margin and CM ratio.
Use the same currency for all inputs. If you sell multiple products, use a weighted average selling price and variable cost based on your expected sales mix.
Break-even explained to a beginner
Think of a lemonade stand. You pay $10 to rent the table for the day regardless of how many cups you sell - that is your fixed cost. Each cup costs $0.50 in lemons and sugar (variable cost), and you charge $2.00 per cup.
Your contribution margin is $2.00 - $0.50 = $1.50 per cup. That $1.50 does not go into your pocket yet - it first goes toward paying off the $10 table rental. Break-even: $10 / $1.50 = 6.7 cups, so you need to sell at least 7 before you start making money.
At 6 cups: $12.00 revenue - $13.00 costs = $1.00 loss. At 7 cups: $14.00 revenue - $13.50 costs = $0.50 profit. Every cup after the 7th adds exactly $1.50 in pure profit because the fixed cost is now fully covered. Below break-even you lose money; above it, each additional unit earns exactly one contribution margin in profit - no more fixed cost to absorb.
Break-even formula
The break-even calculation starts with contribution margin - the amount each unit contributes to covering fixed costs:
$$\text{Contribution Margin} = \text{Selling Price} - \text{Variable Cost per Unit}$$
$$\text{CM Ratio} = \frac{\text{Contribution Margin}}{\text{Selling Price}} \times 100$$
Break-even in units and revenue:
$$\text{Break-Even Units} = \frac{\text{Fixed Costs}}{\text{Contribution Margin per Unit}}$$
$$\text{Break-Even Revenue} = \frac{\text{Fixed Costs}}{\text{CM Ratio}}$$
Both formulas give the same answer expressed differently. Use units when you produce a single product. Use revenue when you sell multiple products or services at varying prices - the CM ratio method averages across your product mix automatically.
Contribution margin explained
The contribution margin is the profit engine of a business. Every unit sold contributes its CM to: (1) paying down fixed costs, and (2) generating profit after fixed costs are covered.
| Units Sold | Revenue | Variable Costs | Contribution Margin | Fixed Costs | Profit / (Loss) |
|---|---|---|---|---|---|
| 0 | $0 | $0 | $0 | $50,000 | ($50,000) |
| 500 | $50,000 | $30,000 | $20,000 | $50,000 | ($30,000) |
| 1,000 | $100,000 | $60,000 | $40,000 | $50,000 | ($10,000) |
| 1,250 | $125,000 | $75,000 | $50,000 | $50,000 | $0 |
| 1,500 | $150,000 | $90,000 | $60,000 | $50,000 | $10,000 |
| 2,000 | $200,000 | $120,000 | $80,000 | $50,000 | $30,000 |
Worked examples for break-even point
| Business | Fixed Costs | Price | Variable Cost | CM | CM Ratio | Break-Even Units | Break-Even Revenue |
|---|---|---|---|---|---|---|---|
| Coffee shop | $8,000/mo | $5.00 | $1.50 | $3.50 | 70% | 2,286 | $11,429 |
| SaaS product | $50,000/mo | $99 | $5 | $94 | 95% | 532 | $52,632 |
| E-commerce | $20,000/mo | $75 | $40 | $35 | 47% | 572 | $42,857 |
| Manufacturer | $200,000/mo | $500 | $300 | $200 | 40% | 1,000 | $500,000 |
I notice the most instructive comparison in the examples table is the coffee shop versus the SaaS product.
The SaaS business carries fixed costs more than six times higher ($50,000 vs $8,000/month), yet it breaks even at just 532 subscribers because its CM ratio is 95% - nearly every dollar of revenue is contribution margin. The coffee shop, with a 70% CM ratio, needs 2,286 cups per month despite its much lower fixed base.
This is operating leverage in practice: high fixed costs are only viable when the margin per sale is high enough to absorb them quickly. If the SaaS CM ratio dropped to 47% (like the e-commerce row), break-even would jump from 532 to roughly 1,064 subscribers at the same cost base.
Margin of safety
The margin of safety measures how much sales can fall before the business hits break-even - it quantifies the buffer between current performance and the loss threshold:
$$\text{Margin of Safety} = \frac{\text{Actual Revenue} - \text{Break-Even Revenue}}{\text{Actual Revenue}} \times 100$$
If your current revenue is $200,000 and break-even revenue is $125,000, your margin of safety is ($200,000 − $125,000) / $200,000 × 100 = 37.5%. This means sales could drop 37.5% before you start losing money.
A margin of safety above 20% is generally considered healthy; below 10% indicates vulnerability to demand fluctuations.
One pattern I see repeatedly: business owners treat break-even as a target rather than a floor.
A business running exactly at break-even has zero buffer for a slow month, a lost client, or an unexpected cost. The 20% margin-of-safety guideline maps to roughly two to three months of revenue cushion.
A business with $125,000 break-even revenue and $150,000 actual monthly revenue has a 16.7% margin of safety - below the healthy threshold and exposed to a single bad quarter. Increasing actual revenue to $160,000 brings the margin of safety to 21.9%, a more defensible position.
Run the margin-of-safety calculation on your own numbers: enter your break-even revenue from the calculator above, then check whether your current revenue sits above or below the 20% buffer.
Business applications
- Pricing decisions: If raw material costs rise, break-even analysis instantly shows what price increase is needed to maintain the same break-even point. It makes the trade-off between margin and volume explicit.
- Capacity planning: Before adding a new production shift or hiring additional staff, calculate how much break-even increases and what extra sales volume is needed to justify the investment.
- Fixed vs. variable cost trade-offs: Outsourcing converts fixed costs (employee salaries) to variable costs (contractor fees), lowering break-even but also capping the upside once volume exceeds the fixed-cost model's efficiency.
- New product launches: Before launching a product, use break-even to set a realistic sales target. If the break-even is 10,000 units/month in a market where 5,000 units is realistic, the economics don't work at the current cost structure.
- Investor presentations: Break-even analysis is a standard element of business plans and pitch decks - investors want to know when the business will stop burning cash.
Frequently asked questions about break-even point
What is a break-even point?
The break-even point is the level of sales at which total revenue equals total costs - zero profit, zero loss. It can be expressed in units (how many products must be sold) or in revenue (how much total sales are needed). Below break-even, the business loses money; above it, every additional unit contributes pure profit equal to the contribution margin per unit.
What is the break-even formula?
Break-Even Units = Fixed Costs / Contribution Margin per Unit. Contribution Margin = Selling Price − Variable Cost per Unit. For $50,000 fixed costs, $100 price, $60 variable cost: CM = $40, break-even = 1,250 units. Break-Even Revenue = Fixed Costs / CM Ratio = $50,000 / 0.40 = $125,000.
What counts as a fixed cost vs. a variable cost?
Fixed costs are constant regardless of production volume: rent, salaried employees, insurance, subscriptions, loan repayments. Variable costs scale with sales: raw materials, packaging, direct hourly labour, shipping, sales commissions. Some costs are "semi-variable" (e.g., a utility bill with a fixed base charge plus per-unit usage) - split these into their fixed and variable components.
What is contribution margin ratio?
CM Ratio = Contribution Margin / Selling Price × 100. A CM ratio of 40% means 40 cents of every dollar of revenue contributes to covering fixed costs and generating profit. Higher CM ratios mean you reach break-even faster and keep more of each incremental dollar of revenue as profit.
How is break-even different from profit?
Break-even is not profitability - it's the zero-profit threshold. Profit = (Units Sold − Break-Even Units) × Contribution Margin per Unit. If you sell 1,500 units when break-even is 1,250, profit = 250 × $40 = $10,000. Every unit above break-even adds exactly one contribution margin in profit.
Quiz: how well do you know break-even?
1. What does contribution margin measure, according to this page?
2. Using the coffee shop row in the worked examples table ($8,000/month fixed costs, $5.00 price, $1.50 variable cost), what is the break-even unit count?
3. Why does the SaaS product in the examples table break even at only 532 subscribers despite fixed costs more than six times higher than the coffee shop?
4. According to the margin-of-safety section, if current revenue is $200,000 and break-even revenue is $125,000, what is the margin of safety, and what does the page say about it?
5. The page warns that treating break-even as a target rather than a floor is a common mistake. What specific example is given to illustrate the risk?