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Price per Litre Calculator

Compare 2–4 products by their real unit price: prices are normalized per 100 g, per kg, per litre, per ounce or per item, the cheapest one is highlighted and the rest show how many percent more they cost.

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Items 3 and 4 are optional — leave them empty to compare just two products.

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Result

This page opens the comparison tuned for liquids: enter the price and volume of each bottle or carton — in millilitres or litres — and every product is restated as its cost for one litre, with the cost per 100 ml alongside for small containers.

Per-litre pricing is where bottle marketing does the most damage: a 330 ml can, a 500 ml bottle and a 1.5 l family pack of the same drink can differ by a factor of three per litre without any of the shelf tags making it obvious. Enter up to four offers, and the cheapest per litre is highlighted while the rest show exactly how many percent more they cost.

The comparison works for anything sold by volume — drinks, cooking oil, detergent, motor oil, paint — and is currency-agnostic. Copy the finished table as plain text with one click to keep or share.

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Accepted Formats & Rules

  • 2–4 item rows with an optional label, price, quantity and unit (g, kg, ml, l, oz, lb or item).
  • Normalized price per 100 g, per kg and per oz for weight, per 100 ml and per litre for volume, per item for counted packs.
  • Cheapest item highlighted, the rest tagged with the exact percent difference; one-click copy of the comparison.

Key Benefits

✓ Turns any mix of pack sizes into one comparable number, so 2.50 for 500 g and 4.00 for 1 kg stop looking similar (they are 5.00 vs 4.00 per kg).
✓ Highlights the cheapest item and prices every other item as a percentage more expensive — the overpay is visible at a glance.
✓ Unit-aware: grams, kilograms, ounces and pounds compare with each other, millilitres with litres, and counted items per piece.

Use Cases

  • • Compare 2.50 for 500 g against 4.00 for 1 kg and see instantly that the small pack costs 25% more per kilogram.
  • • Find the cheapest drink per litre among a can, a bottle and a family pack before taking one off the shelf.
  • • Check whether a multipack of 24 pieces really beats two packs of 10 by comparing the price per item.