Serving Size Calculator
Calculate exact ingredient amounts for any number of servings. Enter a recipe and your target portion count. Free serving size calculator with instant results.
Quick Party Sizes
How to use this tool
Set recipe and target portions
Enter how many your recipe normally serves and how many guests you're feeding. Use the quick party size buttons (10, 20, 30, 50 guests) for common event sizes.
Add your ingredients
Enter each ingredient name, the amount the original recipe needs, and the unit. Scaled amounts appear to the right instantly.
Read scaled amounts
Each ingredient shows the scaled amount in the same unit. For fractional amounts, the result shows as ¼, ½, ¾ etc. for easy measuring.
Tips
For buffet-style parties, reduce quantities by 10–15% — guests eat less when many dishes are available.
Order 10% extra on perishable ingredients for large events to account for spillage, wastage, and generous portions.
For drinks, plan for 2–3 glasses per person per hour. This scales independently from food.
About this serving size calculator tool
Planning food quantities for a party or large gathering is one of the trickiest parts of event cooking. Too little and guests go hungry; too much and you have expensive waste. A serving size calculator takes the guesswork out by precisely scaling every ingredient from your recipe's original yield to your exact guest count.
The calculation is simple: each ingredient is divided by the original portion count and multiplied by the target. A recipe serving 4 people that needs 200g of pasta requires 1,000g (1kg) for 20 people. This calculator does that arithmetic instantly for every ingredient, including fractions for small-quantity items.
For buffet-style events, bear in mind that people eat less when there are many dishes to choose from. A guest who might eat 200g of pasta as a main course will eat around 100–130g when it's one of several dishes. Reduce your calculated quantities by 10–15% for multi-dish buffets or tapas-style events.
Equipment is often the limiting factor for very large batches. Before scaling a recipe to 50+ portions, consider whether your largest pot, oven, or mixing bowl can handle the volume. Sometimes cooking three batches of 20 portions is more practical than attempting one batch of 60.
Frequently asked questions
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