How much do you need to sell to cover the cost of being open?

Sales can improve without the business reaching a sustainable result. You might sell more appointments, meals or products and still have too little left to cover rent, support work and equipment.

A break-even calculation connects sales volume with the costs those sales must cover. It gives you a target to examine: how many sales would this business need at these prices and costs? It does not tell you whether customers will buy that much, whether you have the capacity to serve them, or when their money will arrive.

What this means for your business

Use break-even when you are considering an opening schedule, a new offer, a change in price or a commitment to more overhead. It is especially useful when a sales target sounds reasonable but has never been translated into appointments per week or orders per day.

If the required volume is beyond your practical capacity, the answer cannot simply be to sell harder. You may need a different price, offer, cost structure or operating plan. If volume looks attainable, the next task is to test demand and the cash needed to reach it.

Separate costs by what makes them change

For this calculation, a variable cost changes with the units you sell. A fixed cost stays the same within the period and operating range you are considering. The same expense can behave differently over different time horizons.

A payment-processing fee may rise with every transaction. Rent usually does not change when you sell one more item. Labor can contain both kinds of behavior: an already scheduled shift may stay the same, while additional volume eventually requires another person or overtime.

Do not label all direct costs variable or all wages fixed without examining the work. If a higher volume requires another shift, calculate a second scenario with that shift included. Use a consistent period for every amount; divide an annual cost by twelve to allocate it across twelve months, while retaining its actual payment date in your cash forecast.

A worked example for a service business

Imagine a service business with an average selling price of $120 per appointment. Materials and other costs that vary with each appointment total $45. The remaining contribution is $75 per appointment. Monthly fixed costs in this teaching example are $9,000.

Break-even appointments = $9,000 ÷ ($120 − $45) = 120 appointments per month.

Read that calculation in two steps. Each appointment first pays its own $45 of variable costs, leaving $75 to help cover the monthly $9,000. Dividing $9,000 by $75 tells you how many of those $75 contributions are needed. You do not divide by the $120 selling price, because part of each sale is already needed to deliver it.

When the result is a fraction, round up if you sell only whole units. If fixed costs were $9,100 with the same $75 contribution, the calculation would give about 121.33 appointments. At 121, you would still be $25 short; at 122, you would be $50 above those fixed costs. This is why rounding down can turn a break-even target into a small planned loss.

At 100 appointments, contribution is $7,500 and the business is $1,500 short of the fixed costs included. At 140 appointments, contribution is $10,500, leaving $1,500 after those fixed costs.

The final column is the result of this specific model. It is not a claim about after-tax profit or money available to withdraw. Any omitted expense, owner-work allowance or additional capacity cost changes the interpretation.

Turn the target into an operating question

If the business opens twenty days in the month, 120 appointments means six completed appointments per open day on average. Cancellations, demand concentrated on particular days and the time needed between appointments can make six harder to deliver than the average suggests.

If the current schedule can accommodate only five appointments per day, the model requires a change. Extending hours could add sales, but it could also add fixed or step-up costs. Recalculate after that change rather than keeping the old break-even target.

For a restaurant, average orders can conceal the mix of lunch, dinner, delivery and large parties. Each may leave a different contribution and use different staff or space. An average based on last month's mix becomes less useful if tomorrow's growth comes mainly from a lower-contribution channel.

When you sell several things

For a reasonably stable sales mix, you can estimate a contribution margin ratio: total sales minus the variable costs of those sales, divided by total sales. Fixed costs divided by that ratio gives estimated break-even sales dollars.

For example, $40,000 in sales and $24,000 in variable costs leave $16,000, a 40% contribution margin. With $12,000 in fixed costs, break-even sales are $30,000 at that same mix and cost behavior. A shift toward more costly products or a new commission changes the ratio.

Forty percent means $0.40 of each sales dollar remains for fixed costs and any result beyond them. That is why the calculation is $12,000 ÷ 0.40, rather than dividing by 40. If percentages are the confusing part, work through margin and markup alongside this example.

Keep the estimate visible as an assumption. Where products are very different, calculate the important offers separately before combining them. A single average can otherwise allow a busy but weak offer to hide behind a stronger one.

Break-even still needs a cash plan

Reaching the modeled sales level does not ensure cash arrives before bills. You may buy stock in advance, offer customer credit or pay for equipment. Debt principal and owner distributions also affect cash without behaving like the operating expenses used in this model.

Put those dated movements in the 13-week cash workbook. Compare the break-even target with both the capacity to deliver and the money needed along the way. These are related checks, and each can reveal a different reason to change the plan.

Before you use the number

Write beside the result: the period, price, variable cost, fixed costs included, sales mix and capacity limit. Test a lower sales volume and a higher cost case. If contribution per unit is zero or negative, additional units do not cover positive fixed costs in this model; the offer itself needs attention.

Then compare the target with recent completed sales and credible demand evidence. A useful target should lead to a specific decision, such as changing the schedule, revising the offer or testing a price, with a date to review what actually happened.

Sources and further reading

The Small Business Administration's business-planning guide includes break-even planning and the fixed-cost divided by unit-contribution formula. Source consulted September 20, 2026. All figures here are illustrative. Read how to evaluate a price increase and how to test whether people will pay before treating a calculated target as a sales forecast.