Plain definition
A volume variance measures the effect of actual activity differing from planned activity, using a stated contribution, revenue, or cost basis. It does not explain why the volume changed.
Illustrative example
Monetary examples use Saudi riyals (SAR). The same principles apply in other currencies.
A café planned 10,000 drinks with contribution each but sold 8,500. The sales-volume variance is adverse: (8,500 − 10,000) × 6. The manager checks footfall, stock availability, and opening hours before cutting staff.
Why it matters
Volume may change profit, capacity, and working-capital needs at once. Isolating it stops management from cutting productive capacity when demand, rather than execution, caused the movement.
Practical consequence
Define the activity and per-unit basis, then keep price and mix effects separate. Translate volume changes into cash only after applying collection and payment timing.