Unit Price Calculator
Compare price per unit between two package sizes to find the better value.
Best for: Use it at the grocery store or when shopping online to compare package sizes, bulk vs single, or brands sold in different quantities.
Purpose: Compare price per unit between two package sizes to find the better value.
Input
Result
EstimateBetter value
Option B — 18.7% cheaper per oz
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- Type
- Industry Standard
- Method
- Industry-standard method
- Confidence
- High
Uses the standard formula and conventions the industry relies on.
The per-unit figures let you compare unlike sizes on equal terms. The percentage shown is how much cheaper the better option is per unit - useful when the raw prices look similar.
- Inflation often matters more than expected over the long run.
- Small rate changes can significantly affect total outcomes.
- Long-term consistency usually beats short-term timing.
Small, consistent changes compound: time in the market usually beats timing the market.
How it's calculated & sources
Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.
How it works
Unit price = Price ÷ Quantity. The option with the lower price per unit is the better value — a bigger package is not always cheaper.
Example
$3.99 for 12 oz = $0.333/oz vs $6.49 for 24 oz = $0.270/oz → the 24 oz is about 19% cheaper per ounce.
Frequently asked questions
Does a bigger size always cost less per unit?+
No. Retailers sometimes price larger packages at a higher unit cost, so it pays to check. This tool shows the per-unit price of each so you can compare directly.
What if the two items use different units?+
Convert both to the same unit first (for example grams), then compare. Comparing dollars-per-ounce to dollars-per-kilogram directly gives the wrong answer.
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