PartyCalcs.uk
Dietary Requirements Tracker
Track dietary needs for your event and calculate exact counts for each requirement.
How We Calculate This
This calculator converts dietary requirement percentages into exact guest counts and estimates menu planning needs.
How it works
- Count per requirement = total guests × percentage (rounded up)
- Total with restrictions = sum of all counts ÷ overlap factor (capped at total guests)
- Overlap factor (default 1.3) accounts for guests with multiple requirements — it is a PartyCalcs planning estimate, not a measured statistic, and you can adjust it in Advanced Options
- Menu options = 1 standard + 1 each for vegetarian, vegan and gluten-free + 1 combined halal/kosher option. Dairy-free and nut-allergy guests are catered for within those dishes rather than adding their own option
Frequently Asked Questions
In the UK, around 5-10% of the population is vegetarian and 2-3% is vegan, but this varies hugely by age group and location. For younger crowds (18-30), expect 15-20% vegetarian/vegan. Always ask guests directly rather than guessing, but these percentages are useful for initial planning.
Not necessarily. A well-planned menu can cover multiple requirements. For example, a vegan and gluten-free main course covers vegans, vegetarians, dairy-free and gluten-free guests in one dish. Aim for 3-5 menu options that between them cover all requirements.
The overlap factor accounts for guests who have multiple dietary requirements — for example, someone who is both vegan and gluten-free. A factor of 1.3 means the raw total of requirements is divided by 1.3 to estimate the actual number of people. The 1.3 default is a PartyCalcs planning estimate (roughly a 30% overlap), not a measured statistic; adjust it in Advanced Options if you know your guests, or set it to 1.0 to treat every requirement as a separate person.
Order 10% extra portions as a minimum. This covers last-minute guests, guests who change their mind, and dietary requirements not declared in advance. For allergen-specific dishes (nut-free, gluten-free), order at least 2 spare portions regardless of numbers.
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Last updated: March 2026
All calculations are estimates. Adjust quantities based on your guests and event type.