This unit price calculator compares product packages by cost per unit, so bulk deals can be judged fairly.
Everyday life
Unit Price Calculator
Compare unit prices of two items to find the better deal.
Calculator
About this calculator
Formula notes
unit price = total price / quantity; the lower unit price wins.
Worked examples
- Example: 500 g at 4.50 (0.90/100 g) beats 300 g at 3.00 (1.00/100 g).
- A 750 g package at $6.30 costs $0.84 per 100 g, while a 1.2 kg package at $9.60 costs $0.80 per 100 g, making the larger pack 4.8% cheaper per unit.
How to use it
- Enter each product's price and quantity.
- Read the cost per unit for each.
- Pick the lower unit price, checking quality needs.
Frequently asked questions
Is the biggest pack always cheapest per unit?
Usually but not always — promotions on small packs can undercut bulk.
Should units match before comparing?
Yes. Convert grams and kilograms to the same unit first for a fair comparison.
Limits and interpretation
- Quantities must describe comparable usable contents; drained weight, concentration, quality, and included accessories can invalidate a simple comparison.
- Coupons, membership prices, taxes, expiry, storage cost, and likely waste may change the practical best choice.