How to calculate your restaurant break-even point (with examples)

Short answer: break-even = fixed costs ÷ contribution margin ratio, and the version worth memorising is covers per day. A venue with $32,000 of monthly fixed costs keeping 65 cents of each sales dollar breaks even at about $49,200 a month, $1,892 a day over 26 trading days, 79 covers at a $24 average spend. That one number turns every quiet Tuesday, roster tweak and “should we open Sundays” debate into arithmetic. The discipline around it: know which costs are genuinely fixed, forecast at least 15–25% above break-even before signing anything, re-run the number quarterly because it drifts, and use the same logic per daypart to decide when opening the doors is worth it.

The formula, without the fog

Three inputs. Fixed costs: everything you pay whether or not a customer walks in, rent and outgoings, insurance, subscriptions, loan repayments, the base roster you would run regardless, your own minimum wage. Variable costs: what scales with each sale, food and beverage (the big one), card fees, packaging. Contribution margin ratio: 1 minus the variable percentage, at 33% variable costs you keep 0.67 of each dollar. Then: break-even revenue = fixed ÷ ratio. The classification is where honesty matters: owners flatter the number by calling the base roster “variable”, but if Tuesday’s quiet shift still gets paid, it is fixed, and the maths should say so. (Your prime cost work already splits these lines; this analysis just re-uses them.)

A worked example, down to covers

Now the number does work. Forecast 95 covers? Your margin of safety is 17%, adequate, not comfortable. Considering a site whose rent adds $2,000 a month? That is +8 covers a day, forever, ask the 8% occupancy test whether the location earns them. Thinking about a $6 lunch special? At 35% variable costs it contributes $3.90, so it takes 485 of them to cover the month’s $1,893-a-day gap you are trying to close, sometimes worth it, but now you know what you are buying.

The margin of safety: the gate for big commitments

Break-even is not a target, it is a floor, and the distance between forecast and floor is the whole safety of the business. Commit to a lease or a loan only when honest, bottom-up forecasting (seats × turns × spend, the method in the business plan guide) clears break-even by 15–25%. Below that, normal variance, a wet month, a slow ramp, a supplier price jump, doesn’t just dent profit, it flips the sign. This is also the stress test lenders quietly run on your numbers, so running it first is both protection and credibility.

Daypart break-even: when opening is the mistake

The monthly number hides a sharper tool: incremental analysis per session. Opening Tuesday lunch costs the INCREMENTAL spend only, the extra labour, energy and prep, because rent is sunk either way. If that increment is $260 and the session reliably contributes $180 (sales × 0.65), the session loses $80 every week it runs, and closing it is arithmetic (the full method, including what to do with near-misses, is in the slow-season playbook). The same maths prices the opposite move: an extra Friday hour, Sunday opening, or a late-night window each earn their place by clearing their own incremental cost, not by feeling busy.

Keep it current: the quarterly re-run

Break-even drifts, always upward: a rent review, two supplier increases and one extra rostered shift can add ten covers a day to the target in a quarter without any single decision feeling significant. Re-run the calculation quarterly (it is ten minutes once the P&L is clean, see accounting basics) and after every material change, and watch the trend, not just the level: a break-even that rose 12% while prices rose 4% is telling you exactly where to look.

Mistakes that make the number lie

• Calling the base roster “variable” to flatter the result.
• Using aspirational average spend instead of your POS’s actual number.
• Computing it once at opening and steering by a two-year-old floor.
• Ignoring the margin of safety and signing commitments at 102% of break-even.
• Applying whole-venue maths to daypart decisions instead of incremental costs.

Frequently asked questions

What is break-even for a restaurant?
The sales level where you stop losing money: fixed costs divided by contribution margin ratio. If rent, wages you must pay regardless, insurance and the rest total $32,000 a month, and every sales dollar keeps 65 cents after food and variable costs, break-even is $32,000 ÷ 0.65 ≈ $49,200 a month. Below it every week digs a hole; above it, each dollar contributes 65 cents to profit. It is the single most clarifying number a new venue can know.

How do I work out my contribution margin?
Contribution margin ratio = 1 minus your variable-cost percentage. For most venues the dominant variable cost is food and beverage (say 30–33%), plus genuinely variable extras like card fees and packaging (2–4%). A venue at 33% variable costs keeps 67 cents per dollar, ratio 0.67. Labour is the awkward one: rostered staff are fixed-ish in the short run, casual flex is variable, most operators treat the base roster as fixed and flex as variable.

How do I express break-even in covers per day?
Divide the monthly break-even revenue by trading days, then by average spend. $49,200 across 26 trading days is $1,892 a day; at a $24 average spend that is 79 covers. Covers-per-day is the version worth knowing by heart, because a Tuesday at 45 covers now has a meaning: you are 34 covers short of flat, and every decision (hours, roster, offers) can be priced against that gap.

What break-even margin of safety should I aim for?
Forecast at least 15–25% above break-even before committing to a site or a loan. If break-even needs 79 covers and honest forecasting says 85, one bad month erases you; at 100 forecast covers you can absorb a slow ramp, a rainy quarter or a cost spike. Lenders run exactly this test, which is why the break-even exhibit belongs in every business plan.

How often should I recalculate break-even?
Quarterly, and after any material change: rent review, menu re-price, supplier increases, a new hire. Break-even drifts upward quietly, a 4% food-cost creep plus one extra rostered shift can add 10+ covers a day to the target without any single decision feeling big. Venues that re-run the number each quarter catch the drift while it is still one conversation, not a crisis.

Can break-even analysis decide opening hours?
It is the right tool: compute contribution per daypart (that session’s sales × contribution ratio minus the incremental labour and costs of opening) and a Tuesday lunch that never covers its own incremental cost is arithmetic, not a debate. The same logic prices decisions like staying open an extra hour, opening Sundays, or closing for the slow season, always against incremental costs, since the rent is sunk either way.