Break-Even Point Formula & Worked Example

The formula, straight from the SBA

The U.S. Small Business Administration publishes the version of this formula most lenders expect to see in a business plan: break-even point (in units) equals fixed costs divided by the difference between the sales price per unit and the variable cost per unit. In dollars instead of units, the same calculation becomes fixed costs divided by the contribution margin, where contribution margin is the sales price minus the variable cost per unit, expressed as a percentage of price (SBA break-even point guide, verified current 2026-09-16).

The SBA treats this as more than a background number. A break-even analysis is one of the standard components lenders expect inside a business plan submitted for an SBA-backed loan, because it demonstrates the plan is financially viable rather than optimistic. The agency also flags a detail most calculators skip: build in roughly 10% on top of your projected fixed costs, specifically to absorb the miscellaneous expenses that will not show up until they actually happen.

An expense that only bills once a quarter or once a year, a software renewal, an insurance premium, an annual permit, still belongs in the fixed-cost total. The SBA's guidance is to divide it down to a monthly figure and include it, not skip it because it does not recur monthly.

The mistake that breaks the number: contribution margin vs. gross margin

Gross margin and contribution margin sound close enough to swap, and doing that swap is the single most common way a break-even calculation goes wrong. Gross margin subtracts cost of goods sold, a figure that often has a slice of fixed manufacturing or facility overhead baked into it. Contribution margin subtracts only the costs that actually move with each additional unit sold, which can include sales commissions or per-order shipping that cost of goods sold does not always capture. Break-even math only works with the second one: a business breaks even at the exact point where total contribution margin dollars equal total fixed-cost dollars, and using gross margin in that spot understates how many units it actually takes to get there.

A second category worth naming: semi-variable costs, the SBA's own term for expenses that stay fixed up to a point and then start moving with volume, a phone plan with a base fee plus per-minute charges, a warehouse lease with an overage clause past a certain unit count. Splitting the fixed piece from the variable piece before running the formula keeps the break-even number honest; lumping the whole thing into either bucket pushes the answer in the wrong direction.

A worked example with actual numbers

Say this business sells a single product at $42 per unit, with $18 of variable cost per unit (materials, packaging, the shipping cost tied to that one order). Contribution margin per unit is $42 minus $18, or $24. Break-even in units is $15,180 divided by $24, which comes out to 633 units in the month. In sales dollars, that same $24 gap expressed as a share of price works out to $24 divided by $42, or about 57%; dividing $15,180 by 0.57 gives a break-even revenue target of roughly $26,630.

Two numbers worth sitting with: 633 units is the point where profit is exactly zero, not the point where the business is healthy. A business that expects to sell 640 units a month is not comfortably profitable, it is one slow week away from a loss, which is the practical reason to treat break-even as a floor to build margin above, not a target to land on.

A 2026 restaurant benchmark: why more sales does not always fix it

Restaurants make the cost-structure problem concrete, because the industry tracks it more closely than most. The National Restaurant Association's chief economist reported that 42% of restaurant operators said they were not profitable in 2025, up sharply from 29% in 2024 (WTOP News coverage of the NRA's 2026 State of the Industry report, verified 2026-09-16), while food costs are now running more than 35% above pre-pandemic levels (WhippleWood CPA's 2026 restaurant benchmark guide, updated April 2026). The same guide puts a healthy prime cost, food and beverage cost plus total labor cost combined, at 55% to 65% of revenue, with food and beverage cost alone typically running 28% to 35% of revenue.

The benchmark matters for break-even math specifically because prime cost sits mostly in the fixed-plus-variable blend that determines contribution margin. A restaurant already running a 68% prime cost is not going to break even by selling more covers; more volume at a low contribution margin per plate just multiplies a problem instead of solving it. The fix has to come from the cost side first, renegotiated supplier terms or a labor schedule that actually matches traffic patterns, before volume growth can do anything useful for the break-even number. The same logic applies outside restaurants: if contribution margin per unit is thin, chasing more sales volume is a slower and less reliable fix than shrinking either the fixed-cost base or the variable cost per unit first.

Accounting break-even and cash break-even are not the same date

The formula answers an accrual-accounting question: at what sales volume does revenue equal total cost, on paper, in the period it is recognized. It does not answer a cash question: on what date does the bank balance actually stop shrinking. Those two dates can land weeks or months apart, and the gap is almost always explained by the same mechanics covered in our cash conversion cycle guide: invoices sent to customers who have not paid yet, sitting alongside supplier bills that come due before that payment arrives.

A business can cross its accounting break-even point in month three and still be short on cash in month four, if the revenue that pushed it over the line is sitting in unpaid invoices rather than the bank account. Checking both numbers separately, and watching how far apart they sit, catches a cash crunch a single break-even calculation would miss entirely.

On the fixed-cost side specifically, the line most within a small business's control is the labor cost tied to manual back-office work, invoice entry, payment matching, approval routing. A team that automates AP processing with a tool like BILL or shifts card and bill payments through Ramp is not changing the formula, it is shrinking one of the numbers that goes into it, which lowers the break-even point without touching price or volume at all.

Frequently asked questions

How do you find break-even for your business? Add up every cost that shows up whether or not you sell anything, tack on the SBA's 10% cushion, then find how many sales at your current price and per-unit cost it takes to cover that total. The step-by-step version, in both units and dollars, is worked through above.

What is the BEP formula in its simplest form? Fixed costs on top, the amount each unit brings in toward covering them on the bottom. That bottom number is your price minus everything that only costs you money because that one unit sold.

Does needing more revenue to clear zero automatically mean a worse business? No, not by itself. A company with steep fixed costs but very little cost attached to each additional sale, most software businesses fit this description, can need a large revenue number just to clear zero and still turn a healthy profit past that. The gap between what you are actually selling and that number matters far more than the number's size on its own.

Isn't gross margin close enough to use for this calculation? No, and the gap matters more than it looks. One figure is built for external financial reporting and still carries a slice of overhead baked in from cost of goods sold; the other strips all of that away down to only what changes when one more unit goes out the door, and that narrower number is what break-even math actually needs.

Will a bank ask for this before approving an SBA loan? Very likely. It shows up as a required piece of the plan before the agency will back a loan, right next to startup-cost and cash-flow projections, so skipping it usually just means the application comes back with a request to add it.

A related liquidity check worth running alongside this one: our quick ratio breakdown answers a different question, whether the business can cover what it already owes right now, rather than how many units it needs to sell to stop losing money.