Calculators

Unit Price Comparator

Compare two products by price per kg, litre or piece to find the real deal.

Product A

Product B

Enter both products and press Compare.
—Product A per unit
—Product B per unit

Weight units (g ↔ kg) and volume units (ml ↔ L) convert automatically. Pieces can only be compared with pieces.

Find the real bargain, not the bigger pack

Supermarkets love confusing pack sizes: 500 g for one price, 1.2 kg for another, a “value pack” that is not actually better value. This free online unit price comparator cuts through the noise by reducing both products to a single number — price per kilogram, per litre or per piece — so you can see which one is genuinely cheaper.

How to use it

Enter each product's name, price, quantity and unit (g, kg, ml, L or pcs), then press Compare. The tool converts mixed units automatically — 500 g vs 1 kg and 750 ml vs 2 L are handled for you — and shows the verdict: which product is cheaper per base unit, and by what percentage.

What the verdict means

The verdict compares price per kilogram for weight items, per litre for volume items, and per piece for counted items (eggs, diapers, batteries). If the two products are measured in different families — say rice in kg versus cooking oil in litres — the tool tells you honestly that they cannot be compared, instead of inventing a meaningless number.

Shopping tips

The cheapest per-unit price is not always the smartest buy: check expiry dates on perishables before buying bulk, and compare like with like — a premium brand and a budget brand at the same per-kg price are not the same product. Use this tool in the aisle and you will stop falling for oversized packaging.

Frequently Asked Questions

Is this unit price comparator free?
Yes, free with no sign-up. Compare as many product pairs as you like.
Can I compare grams with kilograms?
Yes. Weight units (g and kg) and volume units (ml and L) convert automatically, so mixed units on the two panels are fine.
Why can’t I compare pieces with kilograms?
Because a piece and a kilogram are different measurement families. The tool refuses to invent a meaningless comparison and tells you the products are not comparable.
What does “N% cheaper per kg” mean exactly?
It means the cheaper product’s per-kilogram price is N% lower than the other product’s per-kilogram price, calculated as (expensive − cheap) ÷ expensive × 100.
Does a cheaper per-unit price always mean I should buy it?
Not necessarily. Factor in expiry dates, storage space and whether you will actually use the larger quantity before it goes bad.