Break-even analysis sounds like something for business school. In practice, it's just answering one question: how much do I need to sell before I start making money?
Every restaurant has a break-even point. Most owners don't know theirs. And that makes a lot of decisions harder than they need to be — because you're guessing at a number that's actually calculable.
Fixed Costs vs. Variable Costs
To calculate your break-even, you first need to understand the difference between two types of expenses.
Fixed costs are expenses that stay the same no matter how busy or slow you are. Rent is the clearest example. Whether you serve 20 covers or 200, your rent is the same. Other fixed costs include your base utilities, insurance, software subscriptions, equipment leases, and salaried management pay.
Variable costs are expenses that rise and fall with your sales volume. Food and beverage cost is the main one — you spend more on ingredients when you sell more food. Hourly labor is also partly variable. If you send staff home early on a slow night, that's a variable cost responding to conditions.
Fixed costs don't care how your night went. They show up on the first of the month regardless. Variable costs, you have some control over.
The Break-Even Formula
Contribution Margin Ratio = 1 − (Variable Costs ÷ Revenue)
Don't let the formula intimidate you. Let's walk through a real example.
That restaurant needs to do $45,000 in sales every month just to cover all its costs. Everything above $45,000 is profit. Every dollar below it is a loss.
What You Can Do With This Number
Once you know your break-even, a few things become much clearer:
Is it realistic?
Divide your break-even by the number of days you're open. In the example above, $45,000 over 26 open days means you need $1,731 in sales every single day just to break even. Is that achievable on a slow Tuesday? If not, you might have a fixed cost problem — and knowing that is the first step to fixing it.
Should you stay open that extra day?
A lot of restaurants debate whether to open Mondays or add a lunch service. Break-even gives you a framework. If staying open an extra day costs you $600 in fixed and variable costs (staff, food prep, utilities) and you typically do $900 in sales that day, you're adding $300 in contribution. If you typically do $500, you're losing $100 every time you open. The math makes the decision for you.
How does a price increase affect it?
Raising menu prices increases your contribution margin, which lowers your break-even. A 5% price increase on a $70,000 revenue month adds $3,500 in sales with very little additional variable cost. That alone can shift your break-even significantly. Run the numbers before you decide a price increase isn't worth the risk.
How Often Should You Check It?
Break-even isn't a number you set once and forget. Your fixed costs change when you renew your lease, add a subscription, or hire a salaried manager. Your variable cost ratio changes when ingredient prices shift or you renegotiate with vendors.
A quarterly review is plenty for most independent operators. Recalculate it whenever something significant changes in your cost structure — a rent increase, a major new expense, or a menu overhaul.
Knowing your break-even point won't solve every problem. But it converts a lot of gut-feel decisions into ones you can actually evaluate with numbers.