How do I calculate my break-even point?

The formula, in revenue and in units

Break-even is the point where total revenue exactly equals total costs, meaning the business is neither making nor losing money. In revenue terms, the formula is fixed costs divided by the contribution margin ratio, where the contribution margin ratio is price minus variable cost per unit, divided by price. In unit terms, the same idea is fixed costs divided by the contribution margin per unit, which tells you how many units, jobs, or clients you need before the business turns a profit.

A business selling more than one product or service at different margins needs a weighted average contribution margin instead of a single per-unit figure, blending each product's margin by its expected share of sales. Skipping this step and using the margin of just one product, usually the one an owner thinks about most, can make the break-even point look better or worse than it actually is.

Deciding what actually counts as a fixed cost

Fixed costs are the ones that do not change with sales volume in the short term: rent, insurance, salaries not tied to production, and loan payments. Variable costs move directly with volume: materials, subcontractor labour, and shipping are common examples. Two decisions trip up most owners doing this calculation for the first time: whether to include a market-rate owner salary, even if the owner is not actually drawing one yet, and whether to include debt service, the principal and interest on business loans, as a fixed cost.

We recommend including both. A break-even calculation that leaves out owner pay tells you the point where the business covers its bills but not the point where it can actually afford to pay the person running it, which is the number that matters. Debt service belongs in fixed costs for the same reason: a business that breaks even on paper but cannot also cover its loan payments is not actually break-even in any useful sense. This is also where gross margin and contribution margin start to diverge, since gross margin typically includes some costs, like production overhead, that behave more like fixed costs than true variable costs.

A hypothetical example

Consider a hypothetical service business with $8,000 in monthly fixed costs, including a market-rate owner salary and a loan payment, charging $100 per job with $40 in variable cost per job. The contribution margin per job is $60, so the business needs roughly 134 jobs a month to break even. In revenue terms, the contribution margin ratio is 60%, so fixed costs of $8,000 divided by 60% gives a break-even revenue of roughly $13,333 a month. These numbers are illustrative only; every business's actual fixed costs, pricing, and variable costs will produce a different result.

Returning to this same hypothetical, raising the price per job from $100 to $110 without any change in variable cost lifts the contribution margin per job from $60 to $70, which lowers the break-even volume from roughly 134 jobs to about 115 jobs a month, a meaningful cushion gained from a modest price increase. This remains illustrative only, but it shows why testing a price change against break-even, rather than guessing, is worth the time it takes.

A related figure worth calculating alongside break-even is the margin of safety, the gap between current sales and the break-even point, expressed in dollars or as a percentage of current sales. A business operating close to its break-even point has very little room to absorb a slow month, while a business with a wide margin of safety can weather a downturn without immediately being at risk.

Using break-even for pricing, hiring, and capacity decisions

Raising price without increasing variable cost improves the contribution margin, which lowers the number of units needed to break even, and running the calculation before a price change shows exactly how much volume the business could lose and still come out ahead. Adding a new hire raises fixed costs immediately, which raises the break-even point the moment the hire starts, before that person has generated any additional revenue.

Running the break-even calculation with the new fixed cost included, before making the hire, shows how much additional volume the business needs to cover that person's cost, which is a more useful test than simply checking whether current cash flow can absorb one more payroll cycle.

Break-even also has a capacity ceiling worth checking: a business that would need more units, jobs, or clients than it physically has the staff, equipment, or hours to deliver has a break-even point that is not just a pricing problem but a capacity problem, and no amount of marketing closes that gap without adding capacity first.

A seasonal business should also calculate break-even separately for its slow season and its busy season rather than relying on a single annual figure, since a business that is comfortably above break-even across the full year can still be underwater for months at a time if the seasonal swing is large enough.

How we use this with clients

As part of our CFO advisory work, we build the break-even calculation directly from a client's actual chart of accounts, separating fixed and variable costs the same way for every scenario so a pricing change, a hire, or a new lease payment can all be tested against the same baseline. Our answer on building a small business budget covers how this fixed-versus-variable split feeds into the broader annual budget.