Your break-even point is the amount of sales — in units or in revenue — you need each month before your business stops losing money and starts making it. It’s one of the simplest and most useful numbers in business, because it turns “am I charging enough?” into a concrete target you can check yourself against every month. This page shows exactly how the calculator above works the number out, with a full worked example using its default numbers.
How break-even is calculated
The calculation rests on three inputs: your monthly fixed costs, the price you charge per unit or project, and the variable cost that comes with producing each one. The formula runs in three steps:
Contribution margin = Price per unit − Variable cost per unit
Break-even units per month = Fixed costs ÷ Contribution margin
Break-even revenue per month = Break-even units × Price per unit
The contribution margin is the part of each sale that’s left over after the costs tied directly to that sale — it’s what actually goes toward paying your fixed costs. Once you know how much each sale contributes, dividing your total fixed costs by that figure tells you how many sales it takes to cover them. Multiply that unit count back by your price and you get the same answer expressed as monthly revenue.
A worked example
Using the calculator’s default numbers: monthly fixed costs of $3,000, a price per unit of $500, and a variable cost per unit of $50.
First, the contribution margin: $500 − $50 = $450 per unit. That’s how much each sale puts toward your fixed costs after covering what it directly costs you to deliver it.
Next, break-even units: $3,000 ÷ $450 = 6.7 units per month. That’s the point where your contribution from sales exactly equals your fixed costs.
Then, break-even revenue: 6.7 × $500 ≈ $3,333 per month. Below that revenue level you’re operating at a loss; above it, every additional sale is profit.
Annualized, that’s 6.7 × 12 ≈ 80 units per year just to keep the business at zero — before you’ve taken home anything beyond what’s already baked into your price.
The mistake: ignoring variable costs
The most common error in break-even thinking is treating price as if it were pure profit — assuming that hitting $3,000 in fixed costs means selling six $500 projects. But each of those projects also costs $50 to deliver, so six sales only generate $2,700 in contribution ($450 × 6), which doesn’t quite cover $3,000 in fixed costs. You need the seventh sale to clear the bar. Skipping the variable-cost step is how people consistently underestimate how much they actually need to sell.
The fix is to always work from contribution margin, not price. Price tells you what comes in; contribution margin tells you what’s actually available to pay your fixed costs.
What else affects your break-even point
The number above is an estimate based on the figures you enter, and it moves whenever the underlying numbers move:
- Fixed costs change. Add a new subscription, raise your rent, or take on more software, and your break-even point rises immediately — you now need more sales just to stand still.
- Price changes. A small price increase has an outsized effect, because it flows straight into contribution margin without adding any extra cost.
- Variable cost changes. A cheaper contractor, a better materials deal, or lower payment-processing fees raise your contribution margin and lower the number of units you need to sell.
- Mixed pricing. If you sell at several different price points, this calculator works best when you run it per price tier, or use a blended average price and variable cost across your typical sales mix.
- Seasonality. Fixed costs are usually steady month to month, but if your sales are seasonal, your break-even point stays the same even though some months will clear it easily and others won’t.
This calculator gives you plain arithmetic on the numbers you provide — it’s not a forecast and it isn’t telling you what will happen, only what has to happen for your current fixed costs, price, and variable cost to balance out. Plug in your own numbers above and use the result as a monthly checkpoint: track actual sales against your break-even units and you’ll know early whether a month is on track or falling short.