Production volume variance measures the effect of producing more or fewer units than planned — specifically, how the difference changes the absorption of fixed overhead. Fixed costs do not care about volume; spreading them over a different unit count than budgeted creates the variance.
The formula
Production volume variance = (Actual units − Budgeted units) × Budgeted fixed overhead rate per unit
Budget: 10,000 units against $200,000 of fixed overhead → $20/unit. Actual production: 9,000 units. Variance = (9,000 − 10,000) × $20 = $20,000 unfavorable — the missing 1,000 units were supposed to absorb $20,000 of overhead, and now the produced units carry it instead.
What it does — and does not — mean
The variance is an allocation artifact: total fixed costs were $200,000 regardless. Unfavorable does not mean money was wasted; it means capacity went unused — which may reflect weak demand (a sales problem), downtime (an operations problem), or a deliberate inventory reduction (good management!). Producing above budget shows favorable variance even if the extra units sit unsold — a well-known way to flatter short-term results while building inventory risk. Read it with the demand picture, never alone; its cousins Volume Variance and Labor Rate Variance complete the variance family.
Is an unfavorable production volume variance always bad?
No — it flags unused capacity, which can be weak demand, downtime, or an intentional inventory drawdown. The cause matters, not the label.
Does the variance change total fixed costs?
No — fixed costs are what they are. The variance only describes how they spread across units produced.
Can overproduction create a favorable variance?
Yes — and that is its known abuse: producing beyond demand absorbs overhead into inventory and flatters current-period results.