Serving-size calculator
Split a known total of food or drink evenly between servings, or work out the total to prepare from a planned portion. It's a quantity split for planning, not nutrition advice or a recommended portion size.
Result
Amount per serving
Result
Total to prepare or buy
How to use this tool
- To share out what you have: enter the total amount and the number of servings.
- To plan what to buy or cook: switch to 'total needed' and enter your planned amount per serving and the number of servings.
- Use any unit — grams, millilitres, slices, pieces — as long as both figures use the same one.
Assumptions
- Assumes equal portions — adjust manually for different appetites or for adults and children.
Technical details: what the fields mean
- Total amount
totalAmount - The total quantity you have, in whatever unit makes sense (grams, ml, pieces).
- Number of servings
numberOfServings - How many people or servings you're dividing it between.
Methodology
Amount per serving = total ÷ servings. Total needed = amount per serving × servings.
Worked example
2000 g of lasagne for 8 people
Inputs: Total amount: 2000, Number of servings: 8
Result: 250 g per serving
Total needed: 75 g of dry pasta each for 6 people
Inputs: Amount per serving: 75, Number of servings: 6
Result: 450 g — a 500 g bag covers it with a little spare.
Total needed: 1.5 slices of pizza each for 12 children
Inputs: Amount per serving: 1.5, Number of servings: 12
Result: 18 slices — three pizzas cut into 8 would give 24.
Practical guidance
- For a mixed group, plan from the per-serving side and round the total up to whole packs, loaves or pizzas.
- Cooked and uncooked weights differ a lot for pasta, rice and meat; keep both figures in the same state.
Common mistakes
- Mixing units, e.g. a total in kilograms and a portion in grams.
- Comparing a cooked portion with a dry-weight total for pasta or rice.
FAQs
How do I divide a total amount evenly between servings?
Enter the total quantity and number of servings to get the size of each equal share. This is a quantity split, not nutrition advice.
How much should I buy for a group?
Switch to 'total needed', enter the portion you plan to serve and the number of people, then round up to whole packs.
Last reviewed: 2026-10-11
A simple even split — real serving sizes vary by age, appetite and dietary need.
This tool provides an indicative estimate, based on the assumptions stated above.
Theme and tool preferences, along with saved and recently used lists, are stored only in this browser.