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Accounting Unit Economics (Per-Unit) Calculator

Calculate per-unit contribution margin, margin percentage, break-even volume, and estimated monthly operating profit.

Your Details

Overview

This Accounting Unit Economics calculator estimates the profitability of one unit and your expected monthly sales volume. Enter the selling price, direct per-unit costs, monthly fixed costs, and expected units sold to review contribution margin, break-even volume, and estimated operating profit.

How it works

The calculator adds direct materials, direct labor, and other variable costs to find variable cost per unit. It subtracts that amount from the selling price to calculate contribution margin. Contribution margin is then multiplied by expected monthly units sold; subtracting fixed costs gives estimated monthly operating profit. Break-even volume is calculated by dividing monthly fixed costs by contribution margin per unit and rounding up to a whole unit.

How to use this calculator

  1. 1Enter your selling price for one unit.
  2. 2Add direct materials, labor, and other variable costs per unit.
  3. 3Enter monthly fixed operating costs.
  4. 4Estimate the number of units you expect to sell each month.
  5. 5Review the contribution margin, break-even units, and estimated monthly operating profit.

Example Calculation

Selling price per unit

$100

Direct materials per unit

$20

Direct labor per unit

$15

Other variable costs per unit

$10

Monthly fixed costs

$10,000

Expected units sold per month

300

Contribution margin per unit

$55.00

Variable cost is 45 per unit, leaving a contribution margin of 55 per unit, or 55.0%. The business breaks even at 182 units per month and produces an estimated monthly operating profit of 6,500 at 300 units sold.

Frequently asked questions

What is unit economics?

Unit economics measures the revenue, costs, and contribution associated with selling one unit of a product or service. It helps show whether additional sales are likely to improve profitability.

What is contribution margin per unit?

Contribution margin per unit is selling price minus variable cost per unit. It is the amount available from each sale to cover fixed costs and then generate profit.

What costs should be included as variable costs?

Include costs that increase when you sell one more unit, such as materials, packaging, shipping, sales commissions, payment fees, and directly attributable labor.

What are fixed costs in this calculator?

Fixed costs are recurring operating costs that generally do not vary directly with each unit sold over the period, such as rent, software subscriptions, and core salaries.

How is break-even volume calculated?

Break-even volume equals monthly fixed costs divided by contribution margin per unit, rounded up because a fraction of a unit cannot normally be sold.

What does a negative contribution margin mean?

A negative contribution margin means variable costs exceed the selling price. Selling more units at that price increases the loss before fixed costs are considered.

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Assumptions and warnings

Assumptions

  • Selling price and per-unit costs are entered before sales taxes unless you choose to include them.
  • Direct materials, labor, and other variable costs change in proportion to units sold.
  • Monthly fixed costs remain unchanged across the expected sales volume.
  • The result is an estimate and excludes items not entered, such as income taxes, interest, depreciation, refunds, and one-off costs.

Warnings

  • This calculator provides planning estimates only and is not accounting, tax, or financial advice.
  • Break-even results are meaningful only when the contribution margin per unit is greater than zero.
Accounting Unit Economics (Per-Unit) Calculator