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Cost Per Unit Calculator

Enter fixed costs, total variable costs, and units produced to find the cost per unit.

How it is calculated

The tool adds the two cost totals for the period and divides by the number of units made: total cost = fixed cost + total variable cost and cost per unit = total cost ÷ units. Fixed cost is the amount for the period that does not change with output, such as rent. The variable cost field is the total variable spending for all units, not the cost of one unit. Units must be at least 1. It also shows the fixed share, fixed cost ÷ units, which is how much of each unit's cost is just covering fixed expenses. Amounts are in dollars. Costs must refer to the same period and the same production run as the unit count.

Worked example

A workshop has $5,000 fixed costs and spends $7,500 in total on materials and labour to make 2,500 units. Total cost: 5,000 + 7,500 = $12,500.00. Cost per unit: 12,500 ÷ 2,500 = $5.00. Fixed share: 5,000 ÷ 2,500 = $2.00 per unit. If only 1,000 units were made, the cost per unit would rise to $12.50 because the fixed costs are spread over fewer units.

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Common mistakes

  • Entering the variable cost of one unit in the variable cost field. The field wants the total for all units; multiply the per-unit figure by the number of units first.
  • Mixing periods, such as a monthly rent with a yearly unit count. Fixed costs, variable costs and units must all cover the same period.
  • Leaving out costs that are really fixed, such as insurance, software or salaried staff. The result then looks better than the true cost.
  • Using the result as the selling price. Cost per unit has no profit in it, so the price must be set above it.
  • Comparing cost per unit at different volumes as if fixed costs stayed fixed. At a very different output, new equipment or staff may change the fixed total.

Sources

About this calculator

Cost per unit tells a business exactly what it costs to produce one item, by adding total fixed costs (rent, salaries, equipment — costs that don't change with output) to total variable costs (materials, direct labor — costs that scale with each unit made) and dividing by the number of units produced. This calculator performs that division to give a single, comparable cost figure.

Manufacturers, small-business owners, and financial analysts use cost per unit as the foundation for setting a profitable selling price, deciding whether a production run at a given volume is worthwhile, and identifying when economies of scale kick in — since spreading the same fixed costs over more units drives the per-unit figure down. It's also a key input into break-even and contribution-margin analysis.

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Comments (1)

  • Editorial team

    The result is an average at this volume, not the cost of the next unit. If fixed costs stay put, one more unit adds only the variable part, which with the defaults is 3,000 divided by 400, or 7.50, against 20.00 for the average. Fixed costs often jump in steps, such as a second machine, and the tool treats them as one flat number. Does your fixed cost change at some volume, and how do you handle that?

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