Break-Even Calculator

How to Use This Calculator

The Break-Even Calculator requires three inputs: your total fixed costs, the variable cost per unit you produce or sell, and the selling price per unit. Once you click Calculate Break-Even, the calculator shows the exact number of units you must sell to cover all costs, plus the total revenue at that point.

The optional Sensitivity Analysis panel adds two more data points. Enter the number of units you expect to sell to see your estimated profit or loss at that volume. Enter a target profit goal to find out exactly how many units you need to sell to reach it.

What counts as a fixed cost?

Fixed costs are expenses that do not change with the number of units you produce or sell. Common examples include:

• Rent and utilities for office or production space
• Salaries for employees whose pay does not vary with output
• Insurance premiums
• Equipment lease payments and depreciation
• Software subscriptions, licenses, and SaaS tools
• Loan interest payments
• Marketing budgets committed in advance (e.g., an annual ad contract)

What counts as a variable cost?

Variable costs change in proportion to the number of units you make or sell. They go up when you produce more and fall when you produce less:

• Raw materials and components
• Packaging and shipping per unit
• Direct labor paid per piece (piecework)
• Sales commissions tied to each transaction
• Credit card processing fees per sale
• Per-unit licensing or royalty fees

Some costs are semi-variable — partly fixed, partly variable. A utility bill might have a flat base charge plus a per-kilowatt-hour component. For break-even purposes, split semi-variable costs into their fixed and variable components and add each portion to the appropriate bucket.

What Is Break-Even Analysis?

Break-even analysis is the process of finding the sales volume at which total revenue equals total costs — the point at which you are neither losing money nor making a profit. Below this threshold every unit sold deepens the loss; above it every unit sold adds to profit.

Businesses use break-even analysis at every stage of the company life cycle. A startup uses it to decide whether a business model is economically viable before writing a single line of code or ordering the first batch of inventory. An established company uses it when evaluating a new product line, setting prices, negotiating a lease, or deciding whether to hire additional staff. Investors use it to assess the margin of safety in a business they are considering funding.

The core insight of break-even analysis is that profit is not just a function of revenue — it is a function of the relationship between revenue and two distinct types of cost. Understanding this relationship gives you precise, quantitative answers to questions that might otherwise be answered by intuition alone.

The Break-Even Formula

The standard break-even formula calculates the number of units that must be sold:

The denominator — Selling Price minus Variable Cost per Unit — is the contribution margin per unit. Once you have the break-even quantity, you can find the break-even revenue by multiplying by the selling price:

There is an equivalent revenue-based formula that skips the unit calculation entirely and is especially useful for service businesses:

Worked example

A small candle company has $50,000 in annual fixed costs (rent, insurance, and salaried labor). Each candle costs $10 in wax, wicks, and packaging and sells for $25.

• Contribution margin per unit: $25 − $10 = $15
• Break-even units: $50,000 ÷ $15 = 3,334 (rounded up)
• Break-even revenue: 3,334 × $25 = $83,350
• Contribution margin ratio: $15 ÷ $25 = 60% (every dollar of revenue contributes $0.60 toward fixed costs and profit)

If the company sells 5,000 candles, its profit is: (5,000 × $15) − $50,000 = $75,000 − $50,000 = $25,000.

Contribution Margin Explained

The contribution margin is the single most important number in break-even analysis. It answers the question: after paying for the direct costs of making one unit, how much money is left to cover overhead and generate profit?

A positive contribution margin means the product is worth making — each unit sold moves you closer to break-even. A zero or negative contribution margin means the product should not be sold at the current price and cost structure: you would lose money on every unit, and no volume of sales would ever cover fixed costs.

The contribution margin ratio expresses the same idea as a percentage of revenue. A ratio of 40% means that for every $1 in sales, $0.40 goes toward fixed costs and profit while $0.60 covers variable costs. Higher ratios are generally better — they mean the business reaches break-even faster and retains more of each incremental dollar of revenue as profit.

Different industries have characteristically different contribution margins. Software companies often have ratios above 70% because the variable cost of delivering one more software license is near zero. Grocery stores typically operate with ratios below 30% because the cost of goods sold is high relative to price. Neither is inherently good or bad — what matters is whether the contribution margin, combined with realistic sales volume, is high enough to cover fixed costs.

Break-Even Analysis for Investments

The same framework applies to investment decisions. Reframe the variables: fixed cost becomes the upfront capital outlay; variable cost becomes the ongoing carrying costs (fees, interest, maintenance); revenue becomes the return or cash flow received.

For a rental property, break-even analysis tells you the minimum monthly rent — or occupancy rate — needed to cover your mortgage payment, property taxes, insurance, and management fees. If your total fixed monthly obligations are $2,400 and you plan to rent by the night at $150 (variable cost of cleaning: $30 per stay), your contribution margin per night is $120, giving a break-even occupancy of 20 nights per month.

For an options trade, break-even is the underlying stock price at which the position neither gains nor loses value at expiration. For a marketing campaign, break-even is the number of new customers needed to recover the campaign spend, calculated using average order value and variable fulfillment cost.

Limitations of Break-Even Analysis

Break-even analysis is a powerful planning tool, but it rests on several simplifying assumptions that may not hold in practice:

• Fixed costs stay fixed. In reality, fixed costs can step up as volume grows — adding a second production shift or a larger facility, for example. These “step fixed costs” create a more complex, multi-tier break-even model.
• Selling price is constant. Volume discounts, promotional pricing, and market competition can reduce the average selling price at higher volumes. If you must cut price to sell more, your contribution margin narrows and break-even rises.
• Variable costs are strictly proportional. Bulk purchasing discounts can lower per-unit variable costs at higher volumes (favorable), while supply constraints can raise them (unfavorable). Neither is captured in a standard break-even calculation.
• Product mix is constant. Businesses that sell multiple products with different contribution margins need a weighted average contribution margin for an accurate multi-product break-even analysis.

Use break-even analysis as a starting point and stress-test it: what happens to break-even if variable costs rise 10%? If you must drop your price by 5% to stay competitive? Sensitivity analysis turns a single-point estimate into a range that accounts for real-world uncertainty.

Common Mistakes in Break-Even Analysis

1. Confusing cash costs with accounting costs. Depreciation is a fixed cost in an accounting sense but not a cash outflow. If you are analyzing cash break-even (i.e., when you stop burning cash), exclude non-cash charges like depreciation and amortization from fixed costs.

2. Ignoring taxes. Break-even in operating income is not the same as break-even in net income. If your goal is a specific after-tax profit, gross up your target profit by your effective tax rate before calculating the units needed.

3. Treating owner salary as a variable cost. If you pay yourself a regular salary regardless of how much the business sells, that salary is a fixed cost, not a variable one. Many owner-operators undercount their own compensation, making their break-even look lower than it really is.

4. Using the wrong unit definition. In a service business, “one unit” might mean one hour billed, one project delivered, or one client served per month. Be precise about what a unit is, and make sure variable costs and revenue are calculated consistently on the same basis.

5. Forgetting opportunity cost. Break-even analysis measures accounting profit, not economic profit. If the capital tied up in the business could earn 8% elsewhere, you need to earn at least 8% on that capital just to break even in an economic sense. Investors often add a required return to fixed costs before calculating break-even to ensure the business beats its cost of capital.

Frequently Asked Questions

What is the break-even point?

The break-even point is the sales volume at which a business covers all of its costs and earns exactly zero profit. Below break-even, the business operates at a loss; above it, every additional unit sold generates profit equal to the contribution margin per unit. It is typically expressed either in units sold or in total revenue.

What is the break-even formula?

Break-Even Units = Fixed Costs ÷ (Selling Price per Unit − Variable Cost per Unit). The denominator is the contribution margin per unit. Multiply the break-even units by the selling price to get break-even revenue. Alternatively, Break-Even Revenue = Fixed Costs ÷ Contribution Margin Ratio, where Contribution Margin Ratio = (Selling Price − Variable Cost) ÷ Selling Price.

What is contribution margin and why does it matter?

Contribution margin is what each unit sold contributes toward covering fixed costs after paying variable costs. It is the engine of profitability: a higher contribution margin means you reach break-even faster and keep more of each additional dollar in revenue. If contribution margin is zero or negative, no volume of sales will ever cover fixed costs.

How do I lower my break-even point?

Three levers move break-even: reduce fixed costs, increase the selling price, or reduce variable costs. In practice the fastest gains come from a combination — a modest price increase paired with one or two fixed cost reductions. Be cautious about cost cuts that reduce product quality, as lower quality can hurt sales volume and effectively raise the true break-even.

Can I use break-even analysis for investments?

Yes. Treat the initial capital outlay as the fixed cost and ongoing carrying charges as variable costs. Break-even then becomes the return level, occupancy rate, or number of customers needed to recover all costs. For options, break-even is the underlying asset price at which the position neither gains nor loses at expiration.

Methodology & Sources

This calculator uses the standard managerial accounting formulas for break-even analysis as described in Managerial Accounting by Garrison, Noreen & Brewer (McGraw-Hill, 16th ed.) and the CMA (Certified Management Accountant) exam curriculum. Break-even units are rounded up to the nearest whole unit, because a partial unit cannot be sold. All calculations are performed client-side; no data is transmitted or stored.