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Start with a realistic example, adjust the inputs, or save your numbers before experimenting.
A practical catering portions scenario
For this example, use guests of 45 people, main food per guest of 350 g, side food per guest of 200 g, buffer of 12 %, and vegetarian share of 20 %. These are starting values, so replace them with numbers that match your situation.
Guests: 25% lower
Change guests to 34 people while keeping the other example values the same.
Guests: 25% higher
Change guests to 56 people while keeping the other example values the same.
Interactive chart
See what changes the result
This result is categorical, so compare the calculated values in the examples and snapshots instead.
The chart changes one input while holding all other current values steady. It is a sensitivity view, not a forecast.
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Quick answer
What does the Catering portions calculate?
How much food is needed for all the guests? This calculator uses guests, main food per guest, side food per guest, buffer, and vegetarian share to estimate food quantity immediately in your browser.
With the values currently entered, the result is 38.9 lb — main food needed. It also shows sides, vegetarian main, and buffered servings.
How to use the Catering portions
- Replace the example values with your own numbers.
- Review the result and supporting figures as they update automatically.
- Check the formula and assumptions before using the estimate for a decision.
Inputs used
- Guests — entered in people
- Main food per guest — entered in g
- Side food per guest — entered in g
- Buffer — entered in %
- Vegetarian share — entered in %
Catering portions formula
Guests × per-person portions × buffer
Assumptions
- Portions are average adult servings.
- Children and special diets need separate adjustments.
Practical guide
Catering portions example and edge cases
How much food is needed for all the guests? Let's use a concrete example, then look at the assumptions that can move the answer.
Example: A practical catering portions scenario
For this example, use guests of 45 people, main food per guest of 350 g, side food per guest of 200 g, buffer of 12 %, and vegetarian share of 20 %. These are starting values, so replace them with numbers that match your situation.
- Guests
- 45 people
- Main food per guest
- 350 g
- Side food per guest
- 200 g
- Buffer
- 12 %
- Vegetarian share
- 20 %
Calculated result38.9 lbmain food needed
Start with main food needed. Then check sides, vegetarian main, and buffered servings to understand what sits behind the main result.
Example results use the default display profile. The calculator above follows your selected country and units.
How to read the result
- Read the main result first. The supporting figures for sides, vegetarian main, and buffered servings explain how the estimate is built.
- The method is Guests × per-person portions × buffer. Keep the units consistent and use values from the same time period.
Edge cases worth checking
When guests is unusual
Portions are average adult servings. Double-check this input before relying on the result.
When vegetarian share is uncertain
Children and special diets need separate adjustments. Run a lower and higher value to see a useful range.
What changes the result most
Guests
Use the count you expect in real life. Round up when a partial people cannot be purchased or used.
Main food per guest
Change main food per guest on its own first. This shows how strongly it affects the answer.
Side food per guest
Change side food per guest on its own first. This shows how strongly it affects the answer.
Try a different scenario
Small changes show whether the answer is stable or sensitive.
Guests: 25% lower
34 people29.4 lbmain food needed
Guests: 25% higher
56 people48.4 lbmain food needed
Main food per guest: 25% higher
438 g48.7 lbmain food needed
Common mistakes
Check guests
Portions are average adult servings. Make sure this matches the number you enter.
Keep vegetarian share consistent
Children and special diets need separate adjustments. Use the same units and time period throughout the calculation.
Do not rely on one catering portions scenario
Run a cautious case and an optimistic case. The range is often more useful than one exact-looking number.
Use this result well
How much food is needed for all the guests?
Check the receipt, package label, serving needs, and current local price before buying.