Break-Even Analysis for Small Business: The Formula, Worked Step by Step

Every small business owner carries a rough version of this number in their head: "We need about thirty grand a month." Ask where that figure came from and the answer is usually a shrug. It might be right. It might be ten thousand dollars off. And the difference between the two is whether a slow month is uncomfortable or dangerous.

Break-even analysis for small business replaces the shrug with arithmetic. It tells you exactly how many sales — in units or in dollars — it takes to cover every bill before a single cent of profit appears. More usefully, it tells you what happens to that line when you raise prices, offer a discount, sign a bigger lease, or hire.

This guide walks through it with one small business's real-looking numbers, from sorting costs to the three what-if tests worth running before any big decision.

What Is Break-Even Analysis?

Break-even analysis calculates the point at which total revenue equals total costs. At that point profit is zero. Sell less and you lose money; sell more and each extra sale adds profit.

The whole method rests on one idea: costs come in two kinds. Some you pay no matter what you sell. Others arrive only when a sale happens. Once you separate them, the break-even point falls out of a single division.

What is the break-even point formula?

Break-even units = Fixed costs ÷ (Price per unit − Variable cost per unit)

The bottom half of that fraction — price minus variable cost — is the contribution margin: the portion of each sale that's left to pay the fixed bills. When there are enough contributions to cover every fixed cost, you've broken even.

Step 1: Sort Your Costs Into Fixed and Variable

Meet Crumb & Crust Bakery, a neighborhood bakery-café open 26 days a month. Its average customer ticket is $12. Here's how its monthly costs sort:

What about costs that are partly fixed and partly variable?

Split them. A power bill with a $400 connection charge plus usage that tracks how many hours the ovens run is $400 fixed and the rest variable. Hourly staff who are scheduled regardless of footfall behave like a fixed cost; commission-paid staff or per-job subcontractors are variable. Don't agonize over perfect precision — a reasonable split gets you 95% of the insight.

Step 2: Work Out Your Contribution Margin

Every $12 ticket costs Crumb & Crust $4.20 in variable cost, leaving $7.80 to put toward the fixed bills. As a share of the price, that's $7.80 ÷ $12 = 65% — the contribution margin ratio.

If contribution margin sounds like gross margin, it's a close relative. Gross margin subtracts cost of goods sold; contribution margin subtracts every cost that moves with sales, including things like card fees and commissions that usually sit in operating expenses. (For the gross-margin side of pricing, see our guide to markup vs margin.)

Step 3: Calculate the Break-Even Point

Now the division. $18,000 of fixed costs ÷ $7.80 per ticket = 2,307.7, which rounds up to 2,308 tickets a month — about 89 customers a day across 26 trading days.

How do I calculate the break-even point in sales dollars?

Divide fixed costs by the contribution margin ratio: $18,000 ÷ 0.65 = $27,692. This is the version to use when you sell many different items at different prices — you don't need a unit count, just your overall variable-cost percentage, which you can read straight off a profit and loss statement.

What if I sell services instead of products?

Use billable hours or jobs as your unit. A consultant billing $150 an hour with $15 an hour of variable cost (software seats, travel, a referral fee) has a $135 contribution margin. With $9,000 of monthly fixed costs, break-even is 67 billable hours — a far more useful target than a revenue figure, because it tells you how full the calendar has to be.

Three Numbers That Make Break-Even Analysis Useful

The break-even point on its own is interesting. These three are where the decisions come from.

Target profit: how much do I need to sell to make a specific profit?

Add the profit you want to the fixed costs. If Crumb & Crust's owner wants $6,000 a month of profit: ($18,000 + $6,000) ÷ $7.80 = 3,077 tickets, or $24,000 ÷ 0.65 = $36,923 of sales. That's a concrete goal — about 118 customers a day — instead of "sell more."

Margin of safety: how far can sales fall before I lose money?

The bakery currently sells $33,000 a month. Subtract break-even: $33,000 − $27,692 = $5,308, or 16% of sales. A slow month that drops sales by more than 16% puts Crumb & Crust into a loss. That's a thin cushion for a business exposed to weather and seasons, and it's worth knowing before the rainy February arrives. Pair it with a 13-week cash flow forecast to see whether the cash can ride out the dip.

What-if tests: what does a change do to break-even?

Look at the discount row. A 10% price cut doesn't raise the break-even point by 10% — it raises it by 18%, because the entire discount comes out of the contribution margin while the ingredients cost exactly the same. Discounts are always more expensive than they look, and break-even analysis is the fastest way to prove it before you run one.

Common Break-Even Mistakes

• Treating COGS as your only variable cost. Card fees, commissions, delivery, and per-job subcontractors all move with sales. Leaving them in "fixed" understates the break-even point.
• Forgetting the owner. If you don't pay yourself a salary, your break-even is a break-even for the business, not for you. Add a realistic owner's draw as a fixed cost if you want the number to mean "I can live on this."
• Leaving out loan principal. Interest is an expense on the P&L; principal repayment isn't, but it's still cash out the door every month. For a cash break-even, include the full loan payment.
• Using unreliable books. Miscategorized expenses make the fixed/variable split meaningless. Categorize expenses consistently and reconcile before you calculate.
• Doing it once. Break-even moves every time a fixed cost or a price does. A number from two years and one lease ago is a guess.

The Bottom Line

Break-even analysis for small business owners comes down to one division: fixed costs over contribution margin. The work is in sorting costs honestly, and the payoff is in what you do with the answer — setting a target-profit goal, knowing your margin of safety, and testing a price change, a discount, or a new lease before you commit to it.

Pull twelve months of closed numbers from your profit and loss statement, split the costs, and do the arithmetic once this week. The number in your head will either be confirmed or corrected, and either way you'll know.

Frequently Asked Questions

What is break-even analysis?

Break-even analysis works out the level of sales at which a business covers all of its costs and makes exactly zero profit. Below that point every month is a loss; above it, each additional sale contributes profit. It is calculated by dividing total fixed costs by the contribution margin — the part of each sale left after the variable costs of making that sale.

What is the break-even point formula?

In units, the break-even point equals fixed costs divided by contribution margin per unit, where contribution margin per unit is the selling price minus the variable cost per unit. In sales dollars, it equals fixed costs divided by the contribution margin ratio, which is contribution margin divided by price. A business with $18,000 of monthly fixed costs and a 65% contribution margin ratio breaks even at about $27,692 of monthly sales.

What is the difference between fixed and variable costs?

Fixed costs stay the same whatever you sell in a month — rent, salaried wages, insurance, loan payments, software. Variable costs rise and fall with each sale — materials, packaging, card processing fees, sales commissions, and per-job subcontractors. Some costs are mixed, such as a utility bill with a fixed base charge plus usage; split those into their fixed and variable parts before running the analysis.

What is a margin of safety?

The margin of safety is how far current sales sit above the break-even point, shown in dollars or as a percentage of sales. A business selling $33,000 a month with a $27,692 break-even has a margin of safety of $5,308, or about 16%. It tells you how much sales could fall before the business starts losing money.

How does a discount change my break-even point?

A discount lowers the price but not the variable cost, so the whole discount comes out of contribution margin and the break-even point rises sharply. On a $12 sale with $4.20 of variable cost, a 10% discount cuts contribution margin from $7.80 to $6.60 — and the number of sales needed to break even climbs by about 18%.

How often should a small business redo its break-even analysis?

Recalculate it whenever a fixed cost changes, such as a new lease, a salaried hire, or a loan, and whenever prices or supplier costs move. Otherwise, refresh it once a quarter from your most recent closed profit and loss statement so the fixed costs and variable-cost percentage reflect what the business is actually spending.

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• Financial Ratios for Small Business: The 8 Numbers That Show If You're Healthy
• How to Calculate Cost of Goods Sold (COGS): The Formula, Worked
• How to Build a Cash Flow Forecast for a Small Business (The 13-Week Method)
• Job Costing for Small Business: How to Know Which Jobs Make Money
• How to Read a Profit and Loss Statement: A Small Business Guide