PartyCalcs.uk
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
A 70cl bottle is 700ml, so it holds exactly 28 single 25ml shots (700 ÷ 25 = 28). At the 35ml single measure common in Scotland you get 20 shots (700 ÷ 35 = 20). For doubles, a 70cl bottle gives 14 double 50ml shots (700 ÷ 50 = 14), or 10 doubles at 70ml (700 ÷ 70 = 10). These figures assume no spillage, so for a busy home bar it is worth rounding your bottle count up. See the full measures table for 70cl, 1 litre and 1.5 litre bottles in our shots per bottle guide.
A standard 70cl bottle contains 28 single measures at 25ml, 20 measures at 35ml, or 14 double measures at 50ml. A 1-litre bottle gives 40 singles at 25ml.
In England and Wales, a single spirit measure is 25ml or 35ml (your choice must be displayed). In Scotland, 35ml is more common. Doubles are 50ml or 70ml respectively.
For a general party, stock vodka, gin, whisky, and rum as the core four. Add tequila for younger crowds. Vodka is the most versatile and popular mixer spirit in the UK.
Plan for about 150ml of mixer per spirit drink. A standard 1-litre bottle of tonic or cola makes about 6-7 mixed drinks. Buy a variety: tonic, cola, lemonade, ginger ale, and soda water.
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Last updated: February 2026
All calculations are estimates. Adjust quantities based on your guests and event type.