Unit Price Calculator
Compare products of different sizes — grams and kilograms, millilitres and litres, ounces and pounds — to see which really is the best value.
Result
Add products to find the best value.
How to use this calculator
- Add each product with its price, size and unit.
- Mix units of the same kind freely, such as 500 g and 1 kg.
- The cheapest per unit is shown first.
Formula
Each size is converted to a base unit (grams, millilitres or items), and the price is divided by it. Results are shown per kilogram, litre or item.
Worked example
Two pack sizes
500 g for 3.00 is 6.00 per kg; 1 kg for 5.00 is 5.00 per kg — the small pack is 20% more expensive.
Assumptions and limitations
- Everything runs in your browser; nothing you enter is uploaded or stored.
- Weight and volume cannot be compared with each other.
Frequently asked questions
Is the biggest pack always cheapest?
Often, but not always — supermarket offers can make smaller packs cheaper per unit. Waste also matters if you cannot use it all.
Can I compare US and metric sizes?
Yes. Ounces, pounds, fluid ounces and gallons are converted automatically.