Wine by the glass calculator.

How the calculation works

The waste allowance is your assumption about unsold or spilled wine. A nominal count of glasses is not the same as the number you actually sell from an opened bottle.

Formula: Bottle cost × serving size ÷ (bottle volume × (1 − waste ÷ 100)).

Worked example

The starting inputs are illustrative assumptions: Bottle cost ($): 18; Bottle volume (ml): 750; Serving size (ml): 150; Expected volume waste (%): 5. They produce 3.79$. These inputs are editable and are not market prices or industry benchmarks.

Use the result

Measure real pours and record bottles discarded at the end of service. Change the assumption when your preservation method, list or sales volume changes.

Keep the period, unit and currency consistent across the inputs. A calculator cannot identify a missing cost from the figures you provide. Retain an invoice or stock-count record for the inputs, and use the result as a check on your operating decision.