How to calculate a restaurant's break-even point

A restaurant's break-even point is the level of sales where revenue covers every cost and profit is zero. The formula is fixed costs divided by contribution margin ratio. If a store has $9,000 a week in fixed costs and keeps 47.5 cents of every sales dollar after variable costs, it needs about $18,947 a week in net sales to break even.

Every dollar above that number is mostly profit. Every dollar below it is a loss. Knowing the weekly figure tells you how much room a store has, how much a slow week costs, and what a rent or food cost change really means.

The restaurant break-even formula

There are three steps.

1. Split your costs into fixed and variable.
2. Work out your contribution margin ratio: 1 minus variable costs as a share of net sales.
3. Divide fixed costs by the contribution margin ratio.

Break-even sales = fixed costs ÷ contribution margin ratio

Use net sales, after discounts and before tax and tips. Use the same period for everything. Many owners work in months because the bills come monthly, then convert to a weekly figure, because sales are easier to track by the week. To convert a monthly cost to weekly, multiply by 12 and divide by 52.

Fixed vs variable costs in a restaurant

A fixed cost stays the same whether you have a big week or a slow one. A variable cost rises and falls with sales.

Fixed costs usually include:

• Rent and common area charges
• Salaried managers, with their payroll taxes and benefits
• Insurance
• Equipment leases and loan interest
• Software subscriptions, the POS fee, music and security
• A base level of utilities and repairs

Variable costs usually include:

• Food and paper
• Royalties and ad fund, when they are a percentage of sales
• Card processing fees
• Third-party delivery commissions
• Hourly labor beyond the minimum crew

Labor is both

Labor is the cost most people get wrong. You cannot open with zero people. The minimum crew to run the store at its quietest hours is close to fixed. The hours you add for lunch and dinner peaks rise with sales.

Split it. Take a slow week's labor hours as the minimum crew and treat that cost as fixed. Treat the rest as variable, as a percentage of sales. For break-even, use the full cost of those hours, wages plus payroll taxes, because that is what the P&L charges. That is a different number from the hourly labor percentage your POS shows. Our guide on labor cost percentage explains the difference.

Royalties and ad fund

In most franchise agreements, royalties and ad fund contributions are a percentage of gross or net sales, so they belong with variable costs. Some agreements also have flat technology fees or minimum royalties, which behave like fixed costs. Check your own agreement. Our guide to franchise royalty fees covers the common structures.

A worked break-even example

Here is one Switchback Grill store in Greeley. First, the variable costs as a share of net sales.

That leaves a contribution margin ratio of 47.5%. For every $1 of net sales, 47.5 cents is left to cover fixed costs and then become profit.

Now the fixed costs for a month.

Convert to weekly: $39,000 × 12 ÷ 52 = $9,000 a week.

Break-even sales = $9,000 ÷ 0.475 = $18,947 a week. That is about $2,707 a day if the store is open seven days.

You can also turn it into orders. At an average check of $12.80, Greeley needs about 1,480 orders a week, or roughly 211 a day, to break even. That is a number whoever runs the store can picture on a Tuesday afternoon.

What the margin of safety tells you

Say Greeley actually does $22,000 a week.

• Contribution: $22,000 × 0.475 = $10,450
• Minus fixed costs of $9,000
• Operating profit: $1,450 a week

The margin of safety is how far sales can fall before the store loses money. Here it is $22,000 − $18,947 = $3,053, or about 14% of sales. A store with a 14% cushion can take a slow month. A store with a 3% cushion cannot.

The same math shows why small sales gains matter. Above break-even, each extra $1,000 of weekly sales adds $475 of profit. Each $1,000 lost takes $475 away.

How cost changes move your break-even

Break-even is not a number you work out once. It moves every time a cost moves.

• If rent goes up $1,000 a month, weekly fixed costs rise by about $231. Break-even rises by $231 ÷ 0.475, about $486 a week.
• If food and paper rise two points, from 30% to 32%, the contribution margin falls to 45.5%. Break-even becomes $9,000 ÷ 0.455, about $19,780 a week. That is $833 more in sales every week just to stand still.

That second line is why food cost matters so much. Two points on the food line raised Greeley's break-even by more than a $1,000 rent increase did. Our guides on how to calculate food cost percentage and prime cost show how to track it each week.

Channel mix moves it too. Third-party delivery orders carry a commission, so a store whose sales shift toward delivery has higher variable costs and a higher break-even, even at the same total sales.

Common break-even mistakes

• Calling all labor fixed or all labor variable. Split it into minimum crew and flex hours.
• Leaving out royalties and ad fund. In a franchise, they commonly add up to several points of sales, depending on the brand.
• Using one great month. Use a normal run of weeks, not your best.
• Forgetting cash. Loan principal payments are not an expense on the P&L, but they come out of the bank. For a cash break-even, add them to fixed costs.
• Counting depreciation as cash. It is a real cost on the P&L, but it is not money leaving the account this week. Decide which break-even you want and stay consistent.
• Never updating it. A new lease, a wage change or a supplier price rise all change the number.

Accounting break-even vs cash break-even

There are two useful versions.

Accounting break-even uses the costs on your P&L, including depreciation. It tells you whether the store is profitable on paper.

Cash break-even swaps depreciation for the cash you actually pay out, including loan principal. It tells you whether the bank balance is growing. For a newer store with a large build-out loan, cash break-even is often the higher and more urgent number.

Neither tells you when you will earn back what it cost to open. That payback question is separate, and it matters a lot if you are weighing when to open a second franchise location.

A simple weekly habit

1. Work out each store's weekly break-even once, from the last three months of your P&L. Our guide on how to read a restaurant P&L shows where each line comes from.
2. Every Monday, put last week's net sales next to it.
3. Note the margin of safety in dollars and as a percentage.
4. If a store's cushion is shrinking for three weeks in a row, look at whether it is sales, food cost or labor that moved.
5. Recalculate break-even every quarter, and any time rent, wages, royalties or a major supplier price changes.

That takes a few minutes per store once the numbers are set up. It turns a vague worry about a slow store into a specific gap in dollars.

Franlever's AI COO watches the weekly side of this for you. It compares each store's sales with its own recent weeks and with the middle store in its brand, and sends the owner one specific lever when something is worth acting on. You can see how Franlever works for the full picture.

General information for restaurant and franchise operators, not legal, tax, accounting or financial advice. Figures in examples are illustrations, not predictions or promises of results. Laws and platform policies change and differ by location, so check the current rules and talk to a qualified advisor about your situation.