Unit Price Calculator
Calculate unit price per kilogram, litre or item from total cost and quantity with this free calculator in your browser.
Enter Values
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Enter the price and weight in grams.
- Press Calculate.
How it works
Price per 100 g = price ÷ weight × 100 — handy for comparing grocery value.
Worked example
$5 for 500 g. = $1.00 per 100 g.
Common mistakes
- Comparing different units (per 100 g vs per kg) without converting.
- Ignoring pack quantity — a bigger pack isn't always cheaper per unit.
Frequently asked questions
What is unit price?
The price per standard unit (per 100 g, per litre, or each) so you can compare different pack sizes fairly.
Why compare unit prices?
Bigger packs aren't always cheaper per unit — unit price reveals the real best value.
Why compare per 100 g?
A common base lets you compare different pack sizes fairly — the lower price per 100 g is the better value.
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Cite this tool
Zerdly. (2026). Unit Price Calculator. Retrieved from https://www.zerdly.com/tools/unit-price-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.