Margin BenchProduct index / business

Ecommerce & profit

Break-Even Units Calculator

Find the minimum whole units needed to cover fixed costs at a specified price and variable cost per unit.

Use this for a sales-volume target with fixed and per-unit costs. Use break-even ROAS for an advertising-efficiency threshold.

Your inputs

Use one currency and a consistent period throughout. Currency results use your input currency, not a preset symbol. Enter decimals with a dot or comma, without thousands separators.

Costs that do not vary with units over the planned volume range, such as rent and fixed salaries.

Realized price after expected discounts and returns, excluding pass-through tax.

Per-unit goods, fulfillment, fees, and other volume-driven costs; must be below selling price.

Your result

Result for the default inputs

Minimum whole units to break even

250

Calculations run in this browser. Inputs are not sent to a server or added to a share link.

What the result means

The result rounds upward because a fraction of a unit cannot cover the remaining fixed costs when units are indivisible. A nonpositive unit contribution cannot cover fixed costs at any sales volume.

The formula

Round up(fixed costs / (net selling price per unit - variable cost per unit))

Results are displayed to at most two decimal places. Calculations use the unrounded inputs.

A worked example

Put the formula to work

Fixed costs for the period (currency)
10,000
Net selling price per unit (currency per unit)
75
Variable cost per unit (currency per unit)
35

Minimum whole units to break even: 250

A price of 75 and variable cost of 35 leave 40 per unit; 10,000 fixed costs therefore require 250 units.

How to use this calculator

  1. Fix the planning period and total its fixed expenses.
  2. Estimate a net unit price and a complete variable unit cost.
  3. Divide fixed costs by positive contribution per unit.
  4. Round up to a whole unit and check whether capacity can support that volume.

Why this number matters

A unit target turns a cost structure into a concrete operational requirement for sales, inventory, and production planning.

Input definitions

Fixed costs for the period (currency)
Costs that do not vary with units over the planned volume range, such as rent and fixed salaries.
Net selling price per unit (currency per unit)
Realized price after expected discounts and returns, excluding pass-through tax.
Variable cost per unit (currency per unit)
Per-unit goods, fulfillment, fees, and other volume-driven costs; must be below selling price.

Assumptions and limitations

  • Assumes constant price and unit cost with no capacity step-changes.
  • For multiple products, a representative unit requires a stable sales mix.
  • Binary floating-point inputs can affect rounding extremely close to an integer boundary.
  • Targets beyond the safe whole-number range are rejected rather than presented as exact.

Methodology

The default result and worked example use the same calculation functions as the interactive tool. The formula cannot verify the quality or scope of your source data.

Read our calculation methodology

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