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Spirits Calculator — Bottles & Measures

A 70cl (700ml) bottle of spirits holds 28 single 25ml shots, 20 shots at 35ml, or 14 double 50ml shots. Enter your guest numbers and event length below to work out how many bottles and mixers you need.

How We Calculate This

This calculator estimates spirits using the UK standard measure system and drinks-per-hour formula.

The formula

Measures per drinker = 2 (first hour) + 1 per additional hour

Bottles = total measures / measures per 70cl bottle

A 70cl bottle contains 28 measures at 25ml, or 14 doubles at 50ml. Mixer requirements are calculated at 150ml per spirit drink.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Adjust quantities based on your guests and event type.