Production volume variance measures the cost effect of producing more or fewer units than budgeted — specifically, how fixed overhead gets over- or under-absorbed when actual output misses the plan.
The formula
Production Volume Variance = (Actual Units Produced − Budgeted Units) × Fixed Overhead Rate per Unit
The fixed overhead rate per unit comes from the budget: budgeted fixed overhead ÷ budgeted units.
Worked example
| Budgeted fixed overhead | $400,000 |
| Budgeted production | 50,000 units |
| Fixed overhead rate | $400,000 ÷ 50,000 = $8.00/unit |
| Actual production | 46,000 units |
| Variance | (46,000 − 50,000) × $8 = −$32,000 (unfavorable) |
Producing 4,000 fewer units left $32,000 of fixed overhead “unabsorbed” — the same rent and salaries spread over fewer units, raising cost per unit.
Reading it honestly
An unfavorable volume variance is not automatically bad management — cutting production when demand falls is often the right call, and overproducing merely to “absorb overhead” creates inventory, not profit. Treat the variance as a capacity-utilization signal, and read it alongside the general volume variance family and your break-even position, which together show whether the shortfall threatens viability or just the budget’s pride.
FAQ
What causes a production volume variance? Any gap between planned and actual output: demand shortfalls, downtime, supply problems, or deliberate production cuts.
Is an unfavorable volume variance always bad? No — producing less to match falling demand is often correct. Overproducing to absorb overhead inflates inventory and hides the real problem.
Does it apply to variable overhead? No — variable overhead scales with output. The volume variance is a fixed-overhead phenomenon.
How is it different from spending variance? Spending variance compares actual vs budgeted overhead cost; volume variance compares actual vs budgeted output at the budgeted rate.