Unit price calculator
Compare up to 3 products and find the truly cheapest.
- Instant
- Free
- Private (processed locally)
- No sign-up
The only price that matters: the unit price
Between the 500 g pack, the 1.2 kg “family size” and the 3-pack, comparing in your head is hopeless. Enter each product’s price and quantity: everything is normalized per kilo or liter, the cheapest is highlighted and the gap shown as a percentage.
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Fill in 2 or 3 products
Price + quantity + unit (g, kg, ml, cl, L or piece).
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Read the unit price
Each row shows its normalized $/kg, $/L or $/piece.
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Follow the verdict
The winner is highlighted in violet, with the % savings versus the runner-up.
Why unit price is your best ally
- It neutralizes packaging sizes: 500 g at $2.50 ($5/kg) beats 1 kg at $5.40.
- It unmasks fake “value” formats and shrinkflation (less product, same price).
- It is legally required on EU shelf labels — but printed so small that this tool stays faster.
- It also works for detergents (price per wash = piece mode) and coffee pods.
Compare comparable products: a concentrate and a diluted product do not yield the same per liter. For detergents, count in “pieces” (number of washes) rather than liters.
Frequently asked questions
How do I compute a price per kilo?
Divide the price by the quantity expressed in kilos: $2.50 for 500 g = 2.50 ÷ 0.5 = $5/kg. The tool handles the unit conversion (g, kg, ml, cl, L, piece) and the division automatically.
Is the large format always the better deal?
No — it is even a classic marketing trap: the “family” size is sometimes more expensive per kilo than the standard one. Only the unit price comparison tells the truth; it is exactly what shelf labels show… in tiny print.
Can I compare solids and liquids?
The tool compares what is comparable: weight products together ($/kg), liquids together ($/L), pieces together. Mixing natures would be meaningless — the verdict only appears when the units belong to the same family.
What about shrinkflation?
That is the quiet reduction of quantity at the same price — the pack drops from 500 to 450 g. Unit price reveals it instantly: recompute after any suspicious packaging change.