PartyCalcs.uk
Cocktail Glass Calculator
Calculate the number of glasses needed by cocktail type for your event bar.
Cocktail Types on Menu (proportional split)
How We Calculate This
This calculator estimates the number of cocktail glasses needed by type, based on guest count, event duration and your cocktail menu proportions.
Drinks per guest
Total drinks = 2 (first hour) + 1 per additional hour
Glass allocation
Glasses are allocated proportionally based on the cocktail types on your menu. If no specific types are entered, a default split of 25% martini, 35% highball, 25% coupe and 15% flute is used.
Glasses in circulation
You don’t need one glass per drink served — washed glasses come back into rotation. The stock you need is the number of glasses each guest holds at peak, multiplied by guest count. The default of 2 glasses per guest matches the UK hire rule of thumb of 2–3 glasses per guest available at any time. A higher value means more stock standing by; a lower value assumes faster wash turnaround.
Service type & breakage
A tended bar breaks fewer glasses (10% spares) than a self-serve or batch setup where guests handle glassware themselves (18%). Switching service type sets the breakage allowance, which you can fine-tune in Advanced Options.
Frequently Asked Questions
Plan for 2 glasses in the first hour and 1 per additional hour. For a 4-hour event that is 5 drinks per guest. However, if you have a glass wash turnaround, you may need fewer glasses in circulation at once. A good rule is to have at least 2-3 glasses per guest available at any time.
Highball glasses are the most versatile, used for G&Ts, mojitos and long drinks. Martini glasses suit espresso martinis and cosmopolitans. Coupe glasses work for daiquiris and champagne cocktails. Flutes are ideal for prosecco cocktails and Bellinis. Most UK events need a mix of highball and one other type.
For events over 30 guests, hiring is usually more cost-effective. UK glass hire companies charge around 30-60p per glass including delivery and collection. Buying makes sense if you entertain regularly. Polycarbonate glasses are a good option for outdoor events and are available from most UK catering suppliers.
Allow 10% extra for breakage at a standard event with bartender service. For self-serve or outdoor events, increase to 15-20%. If using polycarbonate or Tritan plastic glasses, you can reduce spares to 5%. Glass hire companies often include a breakage allowance in their pricing.
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Last updated: March 2026
All calculations are estimates. Adjust quantities based on your guests and event type.