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Unit Price Calculator — Compare Products by Cost Per Unit

~15 seconds

Enter the price, quantity, and unit for each product (two or three). The calculator normalizes every package to a common cost-per-unit, highlights the cheapest, and shows the savings. Only compare products in the same dimension — all weight or all volume.

Price ($)
Quantity
Unit
Price ($)
Quantity
Unit

What this calculator determines

It normalizes two or three packages to a comparable cost per unit so you can see which costs the least per ounce, pound, gram, litre, or other supported unit.

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Examples

12 oz vs 16 oz cereal

A: $4.99 / 12 oz; B: $6.29 / 16 oz

Calculation

  1. A: 4.99 ÷ 12 = $0.4158/oz
  2. B: 6.29 ÷ 16 = $0.3931/oz
  3. B is cheaper by $0.0227/oz (5.5%)

Product B is cheaper — $0.39/oz vs $0.42/oz

Assumptions & Conventions

Same-dimension comparison
Compare weight with weight or volume with volume. Mixed dimensions are not compared because doing so would require information such as product density.
Unit normalization
Different units within the same dimension are converted to a common basis before comparison.

Frequently asked questions