Break-Even Calculator

Calculate the sales volume needed to cover your costs

Use this break-even calculator to find the first whole unit at which contribution covers your fixed costs and selected target profit. It works for product sales and for services or other billable units.

The result is shown as both a unit target and required revenue, with contribution figures that explain how the calculator reached the answer.

What the calculator shows

• Units required, rounded up to the first whole unit that meets the target
• Required revenue at that volume
• Contribution per unit
• Contribution margin
• Fixed costs included in the result
• A chart comparing revenue with total cost as volume approaches the calculated target

How to use the calculator

1. Choose Product sales or Services / billable units.
2. Enter fixed costs for the planning period.
3. Add a target profit, or leave it at zero for a standard break-even calculation.
4. Enter the price and variable cost per unit.
5. If growth triggers another fixed expense, enter the unit threshold and additional fixed cost.

Use values from the same period. For example, combine monthly fixed costs with a monthly sales target. Enter revenue and costs excluding recoverable VAT or GST.

How break-even units are calculated

Contribution per unit is the amount left from one sale after its variable cost:

Contribution per unit = price per unit − variable cost per unit

The initial unit requirement is:

Units required = round up((fixed costs + target profit) ÷ contribution per unit)

Rounding up matters because a fraction of a product or billable unit may not cover the full target.

If the initial required volume reaches the optional step threshold, the calculator adds the extra fixed cost and recalculates the whole-unit requirement:

Stepped units required = round up((fixed costs + additional fixed costs + target profit) ÷ contribution per unit)

Required revenue is the final unit result multiplied by price per unit. Contribution margin equals contribution per unit divided by price per unit, expressed as a percentage.

Worked example

With the default values:

• Fixed costs: $10,000
• Target profit: $0
• Price per unit: $125
• Variable cost per unit: $50
• Contribution per unit: $75

Dividing $10,000 by $75 gives 133.33 units. The calculator rounds this up to 134 units and shows required revenue of $16,750.

The default stepped cost begins at 200 units, so it is not included in this result. The calculator therefore shows fixed costs used of $10,000.

Break-even versus a target profit

A standard break-even calculation uses a target profit of zero. The result then identifies the first whole unit at which contribution covers the selected fixed costs.

When you enter a target profit, the calculator adds that amount to the total that contribution must cover. The result is therefore a units-to-profit target, not the strict zero-profit break-even point.

Interpret the chart

The chart compares revenue with total cost as volume moves toward the calculated unit requirement. Revenue rises with every unit sold. Total cost combines fixed costs with the variable cost of the units.

Where the revenue line reaches or passes the total-cost line is the point at which the selected cost and profit target is covered. A stepped fixed cost can move that point because total cost increases when the threshold is reached.

When no break-even result is possible

Price must be higher than variable cost. If both values are equal, each sale contributes nothing toward fixed costs. If variable cost is higher than price, every additional sale increases the shortfall.

In either situation, the calculator cannot produce a finite break-even volume. Review the selling price, variable cost or cost classification before using the result.

Limits of the estimate

This is a planning estimate. It assumes that the entered price and variable cost remain constant and models only one optional fixed-cost step. It does not estimate demand, discounts, mixed product margins, capacity beyond that step, payment timing, financing costs or taxes not included in the inputs.

The result is only as useful as the cost classification behind it. Check whether expenses genuinely behave as fixed or variable costs, and review significant pricing, staffing or tax decisions with an appropriate professional.

Frequently asked questions

Can I use this calculator for services?

Yes. Choose Services / billable units and treat one hour, appointment, project unit or another consistent billable quantity as the unit. Use revenue and variable cost for that same unit.

Can I include a target profit?

Yes. Enter the desired amount in the target-profit field. The calculator adds it to fixed costs before calculating the required whole units.

When does the stepped fixed cost apply?

It applies when the initial required volume reaches the threshold you entered. The additional fixed cost is then included and the required unit target is recalculated.

Is contribution margin the same as markup?

No. Contribution margin divides contribution by selling price. Markup normally compares an amount with its cost base. The percentages can therefore differ even when they describe the same sale.

Should VAT or GST be included?

Use revenue and costs excluding recoverable VAT or GST, as instructed in the calculator. Include non-recoverable taxes in the relevant cost only when that treatment is appropriate for your situation.