Gas Station Break-Even Analysis: How Many Gallons Do You Need?
Break-even tells you the monthly gallons and store sales you must reach before you earn a dollar of profit. A worked example shows the formula, and the common mistakes that make the answer too optimistic.
Break-even is the amount you must sell each month to cover all your costs. Below it you lose money, above it you start to earn. For a gas station it is more useful when it is split into two numbers: the gallons you need to sell, and the store sales you need to ring.
Work out your break-even in four steps
- Add up your fixed costs for a normal month
- Work out your average gross profit per gallon after card fees
- Work out your store gross margin percentage
- Divide fixed costs by the blended contribution to find the sales you need
This article gives the formula, works through an example with illustrative numbers, and lists the mistakes that make break-even look easier to reach than it really is.
The idea
Every sale adds some contribution to cover fixed costs. For fuel, the contribution is your gross profit per gallon after card fees. For the store, it is your gross margin on each dollar sold, less any variable costs such as supplies. Once contributions add up to your fixed costs, you have broken even.
Step 1: Add up fixed costs
Fixed costs are the ones that arrive whether you sell a lot or a little. In a normal month, include:
- Rent or loan payments (principal and interest)
- Base wages and payroll taxes
- Insurance
- Utilities, phone and software
- A fair figure for your own pay, if you work in the business
Check the margin figures going into your break-even
Step 2: Find your contributions
- Fuel: gross margin per gallon minus card fees per gallon.
- Store: store gross margin percentage. See margins by category.
A worked example (illustrative numbers)
- Fixed costs: $42,000 a month
- Fuel contribution after card fees: 20 cents a gallon
- Store gross margin: 30%
- Expected store sales: $90,000 a month
The store contributes 30% of $90,000, which is $27,000. The remaining fixed costs are $42,000 minus $27,000, so $15,000 must come from fuel. At 20 cents a gallon, that is $15,000 ÷ $0.20 = 75,000 gallons a month.
If your station sells 60,000 gallons, it loses money at that store sales level, however busy it looks. If it sells 100,000, each extra gallon beyond 75,000 adds 20 cents. For how much stations typically sell, see gallons per day.
Why the answer is often too optimistic
- Using gross margin instead of margin after fees. Card fees can take a large slice.
- Leaving out your own pay. Break-even without a salary for you is not break-even.
- Ignoring principal payments. Loan principal is not an expense on the P&L, but it is cash you must find.
- Blending fuel and store. Their margins are very different. See margins by revenue stream.
- Using a good month's margin. Fuel margins swing. Use an average over several months.
How to use it
Compare your actual monthly gallons and store sales with break-even. The gap is your safety margin. If it is thin, you can raise contribution (price, mix, fees), cut fixed costs, or grow volume. It also helps when you consider buying, and our guide to what it costs to buy a gas station shows what else to check.
Break-even is only as good as the numbers going in. If your books do not separate fuel and store, or do not reflect fees, the answer will mislead you.
Break-even: common questions
Which costs are fixed?
Rent or loan payments, base wages, insurance, utilities and software. They stay about the same whether you sell more or fewer gallons.
Should break-even include my own pay?
Yes. If the station cannot cover a fair pay for the work you do, the break-even is understated.
How often should I redo it?
Whenever margins, rent, wages or loan terms change, and at least once a year.
This article is general information, not tax, legal, accounting or lending advice. Figures, rates and rules change, so confirm current details with the agency, lender or professional concerned.
