What this calculator does
Average variable cost is the variable cost formula that spreads costs which move with output, such as materials, direct labour and packaging, evenly across each unit made. Divide total variable cost by the number of units produced over the same period, and the result is the variable cost sitting inside every single unit.
It is deliberately narrower than a full unit cost. Rent, salaried staff and insurance do not go into total variable cost because they do not change with output, so average variable cost answers a specific question: if I make one more unit, roughly how much extra variable cost does that add, holding the per-unit rate constant. That makes it useful for pricing floors and shutdown decisions, where fixed costs are already sunk and the question is whether the variable cost of running is being covered.
The formula
Add up every cost that rises and falls with production over the period, such as raw materials, piece-rate labour, packaging and variable utilities. Divide that total by the number of units produced in the same period. The answer is the variable cost formula result: average variable cost per unit, in the same currency as the total.
| Term | Meaning |
|---|---|
| Total variable cost | The sum of all costs that change with the level of output over the period being measured, excluding fixed costs. |
| Quantity produced | The number of units made in that same period, used as the divisor. |
| Average variable cost | Total variable cost divided by quantity produced: the variable cost per unit. |
The inputs explained
| Field | What to enter |
|---|---|
| Total variable cost ($) | The sum of every cost that varies with production for the period, such as materials, direct labour and variable overhead. Leave out rent, salaries and other fixed costs. |
| Quantity produced | The number of units actually produced over that same period. |
When to use it
Setting a short-run price floor
In the short run, a business can keep operating below full cost as long as price covers average variable cost, because fixed costs are being paid either way. If price falls below this figure, each additional unit sold loses money on the variable cost alone, which is the usual signal to stop production rather than keep going.
Comparing cost efficiency across production runs
Tracking average variable cost run to run shows whether a change to a process, supplier or batch size actually lowered the variable cost per unit, separate from whatever is happening with fixed overhead.
Feeding a full cost-per-unit build-up
Average variable cost is one half of a full per-unit cost figure. Add average fixed cost (fixed costs divided by the same quantity) to get average total cost, which is the number to compare against price for a longer-run profitability check.
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How average variable cost changes as output rises, at a fixed total variable cost
The same $100,000 in variable costs, spread across a range of production volumes.
| Quantity produced | Average variable cost |
|---|---|
| 2,000 | $50.00 |
| 4,000 | $25.00 |
| 5,000 | $20.00 |
| 8,000 | $12.50 |
| 10,000 | $10.00 |
| 20,000 | $5.00 |
How average variable cost changes as total variable cost rises, at a fixed quantity
A fixed run of 5,000 units, at a range of total variable cost levels.
| Total variable cost | Average variable cost |
|---|---|
| $50,000 | $10.00 |
| $75,000 | $15.00 |
| $100,000 | $20.00 |
| $125,000 | $25.00 |
| $150,000 | $30.00 |
| $200,000 | $40.00 |
Questions
What is the average variable cost formula?
Average variable cost equals total variable cost divided by quantity produced. Total variable cost is the sum of costs that change with output, such as materials and direct labour, excluding anything fixed like rent or salaried staff.
How is average variable cost different from average total cost?
Average total cost includes both variable and fixed costs spread across output, while average variable cost only includes the costs that move with production. Average total cost is always higher, by the amount of average fixed cost per unit.
Why does average variable cost matter for a shutdown decision?
In the short run, fixed costs are already committed whether or not production continues. If the price received per unit is below average variable cost, each unit sold loses money even before fixed costs are considered, which is generally the point at which stopping production costs less than continuing.
Does average variable cost always stay the same as output changes?
Not necessarily. This calculator treats total variable cost and quantity as the two inputs for a given period, so it reports whatever average variable cost results from those figures. In practice, the variable cost per unit can rise or fall with volume due to factors like bulk discounts or overtime pay, which is why it is worth recalculating at different output levels rather than assuming one fixed rate.
To see the contribution each unit makes above its variable cost, use the contribution margin calculator. For the extra cost of producing one more unit rather than the average across all units, see the marginal cost calculator.