Break-Even Analysis: How to Calculate Your 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, so profit is zero. Below it, the business loses money; above it, each additional sale contributes to profit.

Break-even analysis is useful when you are:

• Launching a product or starting a business.
• Setting or changing prices.
• Deciding whether to add fixed costs such as staff, rent or equipment.
• Evaluating an acquisition, where debt payments behave like fixed costs.

Fixed costs, variable costs and contribution margin

• Fixed costs stay the same regardless of sales volume in the short term: rent, salaries, insurance, software subscriptions, loan payments.
• Variable costs rise with each unit sold: materials, packaging, payment processing fees, shipping, sales commissions.
• Contribution margin per unit is price minus variable cost per unit. It is what each sale contributes toward fixed costs and then profit.
• Contribution margin ratio is contribution margin divided by price.

The break-even formulas

If price is less than or equal to variable cost, the contribution margin is zero or negative and the business cannot break even at any volume. Our calculator flags this case instead of showing a misleading number.

Worked example

Using the default inputs in the Break-Even Calculator:

• Monthly fixed costs: $30,000
• Price per unit: $100
• Variable cost per unit: $40

Contribution margin is $100 − $40 = $60 per unit, a 60% contribution margin ratio.

• Break-even units = $30,000 ÷ $60 = 500 units per month
• Break-even revenue = $30,000 ÷ 0.60 = $50,000 per month

Every unit above 500 adds $60 to monthly profit, before tax. These are illustrative inputs to show the math.

Margin of safety

The margin of safety is how far sales can fall before you reach break-even:

In the example above, if the business sells 700 units a month, its margin of safety is (700 − 500) ÷ 700, about 29%. A higher margin of safety means more resilience to a bad month.

Break-even for service and subscription businesses

Not every business sells "units". Adapt the idea:

• Service businesses: use billable hours or projects as the unit, with variable costs such as subcontractors and materials.
• Subscription/SaaS: use paying customers as the unit, with variable costs such as hosting, payment fees and support per customer.
• Mixed businesses: use the contribution margin ratio and calculate break-even revenue rather than units.

Using break-even when buying a business

When you buy a business with debt, loan payments behave like a fixed cost. Adding annual debt service to fixed costs shows the revenue the business needs just to cover its obligations. That's a useful complement to the debt service coverage ratio (DSCR). Model debt in the Acquisition Financing Calculator and read business acquisition financing.

How to lower your break-even point

1. Raise prices (if demand allows): increases contribution margin per unit.
2. Reduce variable costs: negotiate with suppliers, reduce waste, improve processes.
3. Reduce fixed costs: renegotiate rent, cut unused software, outsource selectively.
4. Change the mix: sell more of your higher-margin products or services.
5. Avoid adding fixed costs until volume justifies them.

Limitations of break-even analysis

• It assumes constant prices and variable costs per unit, which may not hold at different volumes.
• It treats fixed costs as fixed, but they often step up as you grow.
• It ignores timing: cash flow can be negative even above break-even if customers pay slowly.
• For multi-product businesses, it depends on sales mix assumptions.

Use it as a planning tool alongside cash flow forecasts, not as a precise prediction.

Break-even for a multi-product business

Most businesses sell more than one product, each with a different contribution margin. In that case, calculate a weighted average contribution margin based on your sales mix:

1. For each product, calculate the contribution margin per unit (price minus variable cost).
2. Multiply each product's contribution margin ratio by its share of total revenue.
3. Add those figures together to get the weighted average contribution margin ratio.
4. Divide fixed costs by the weighted ratio to get break-even revenue.

The result only holds if the sales mix stays roughly the same. If customers shift toward lower-margin products, the break-even point rises even when total revenue is unchanged.

Cash break-even vs accounting break-even

Accounting break-even uses costs from the income statement, which include non-cash items such as depreciation. Cash break-even looks at money actually going out, including loan principal repayments, which do not appear as expenses on the income statement.

For a business bought with debt, cash break-even is usually the more important number. Add annual debt service to fixed costs, remove depreciation and recalculate. The break-even calculator lets you add debt service as a fixed cost so you can see both views.

Using break-even in planning

Break-even analysis is most useful when you use it to compare decisions:

• Price change: how many fewer units could you sell after a price increase before profit falls?
• New hire: how much extra revenue does an added salary require?
• New location or product line: what sales volume does it need to stop losing money?
• Cost cut: how far does removing a fixed cost lower the break-even point?

Run each scenario separately and compare the change in break-even revenue and margin of safety.