PartyCalcs.uk
Wedding Cake Calculator — Size & Tiers
Choose the right wedding cake size and tiers for your guest count.
How We Calculate This
This calculator sizes your wedding cake from your guest count, portion size and chosen style.
Formula
- Portions = number of guests (one slice each)
- Total weight = portions × portion size (g) ÷ 1000
- Suggested tiers = a guide from guest count (under 30 → 2, 30-80 → 3, 80-150 → 4, 150+ → 5). It is indicative only — actual capacity depends on tin sizes (a 6/8/10in round 3-tier yields ~135 finger portions). We show your chosen tier count in the headline and flag if it falls short.
- Cost = portions × cost per portion, with a 15% discount applied for naked / semi-naked cakes (less icing work). Cupcake towers are costed per cupcake and cheese towers per kg using the price you enter.
Frequently Asked Questions
For under 30 guests: 2 tiers. For 30-80: 3 tiers. For 80-150: 4 tiers. For 150+: 5 tiers. These are guidelines - you can have fewer tiers and supplement with sheet cakes cut in the kitchen. Some couples choose a smaller display cake plus cupcakes.
A standard wedding cake portion is a slice approximately 2.5cm wide x 5cm tall (about 80-100g). For a dessert course, allow larger slices of 120-150g. Not everyone eats cake - typically 70-80% of guests will have a slice. Order for all guests but expect leftovers.
Traditional tiered cakes cost £3-£8 per portion. A 3-tier cake for 80 guests costs £300-£600. Naked cakes are 10-20% cheaper. Cupcake towers cost £2-£4 per cupcake. Cheese cake towers cost £5-£10 per kg. Elaborate designs and sugar flowers add significantly to the cost.
Popular alternatives: cupcake tower with a small top tier for cutting, doughnut wall, macaron tower, cheese wheel tower, dessert table with multiple options, ice cream station, or a croquembouche. Many couples now choose what they actually enjoy eating rather than tradition.
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Last updated: February 2026
All calculations are estimates. Adjust quantities based on your guests and event type.