Home › Food Business Calculators › Unit Price Comparison Calculator
Compare two packages by normalizing each price to the same unit. Enter both package prices, quantities and units. The calculator reports cost per 100 g for mass, per 100 mL for volume, or per item for countable products, then identifies the lower normalized unit price.
Unit price comparison calculator
Results are estimates based on the values you enter. Nothing you type is sent to or stored on our servers.
Calculation method
For each product, normalized unit price = package price ÷ (package quantity × unit conversion factor). The engine checks the dimension groups first: weight with weight, volume with volume, or item count with item count. It rejects comparisons across different dimensions.
For weight, the result is expressed per 100 g; for volume, per 100 mL; for item counts, per item. The saving percentage is (higher unit price − lower unit price) ÷ higher unit price × 100%.
Verified numerical example
Product A costs 4.00 for 500 g. Its normalized price is 4 ÷ 500 × 100 = 0.80 per 100 g. Product B costs 6.50 for 1,000 g. Its normalized price is 6.50 ÷ 1,000 × 100 = 0.65 per 100 g. Product B is cheaper by (0.80 − 0.65) ÷ 0.80 × 100 = 18.75%.
The larger package costs more at checkout but less per 100 g. Comparing package totals alone can therefore be misleading.
How to use the calculator
- Enter Product A’s price, net package quantity and unit.
- Enter Product B’s price, net package quantity and unit.
- Choose matching dimensions for both products. Grams and kilograms can be compared; milliliters and liters can be compared.
- Calculate and compare the normalized prices and stated saving percentage.
Fair comparison and limitations
The calculator does not assess quality, brand, concentration, edible yield, freshness, ingredient grade or package waste. Compare equivalent products and use net contents rather than gross shipping weight. If package prices use different currencies, convert them to one currency before entering them.
Do not compare weight directly with volume. Even when two products are both liquids, density and composition may differ. The calculator requires matching dimensions rather than assuming one liter equals one kilogram.
Frequently asked questions
Can I compare 500 g with 1 kg?
Yes. Both are mass quantities and the calculator normalizes them to grams.
Can I compare 1 liter with 500 mL?
Yes. Both are volume quantities and are normalized to milliliters.
Why does it reject kilograms versus liters?
Mass and volume are different physical dimensions. A valid density is required for conversion, and the products may not have the same density.
Related tools
For one package at a time, use the Recipe Unit Price Calculator. For ingredient-level recipe cost, see the Ingredient Cost Calculator.