Skip to content
How Much Does It Cost?

Unit price comparison (per kg, lb, L)

The big pack isn’t always cheapest, and multi-buy offers can mislead. Enter each option’s price and size to see the price per kilo, pound, litre or item, ranked from best to worst.

Food Updated:

Inputs

Products to compare

Example prices. Products are only compared within the same group: weight, volume or units.

$
$
$

Starting values are editable examples, not official prices. Results update automatically as you change the inputs.

Result

Unit price comparison (per kg, lb, L) — How Much Does It Cost?

Best value: Store brand

$5.30/kg

Most expensive: Small pack
$7.56/kg
Difference between cheapest and dearest
29.9%
ProductPrice per unit of measureVs best
Store brand$5.30/kg0%
Large pack$5.60/kg5.7%
Small pack$7.56/kg42.6%
Price per unit of measure
Calculation breakdown
  1. Quantity in base unit (kg, L or item) = quantity × conversion factor
  2. Unit price = price ÷ quantity in base unit
  3. The cheapest costs 29.9% less per unit of measure than the dearest

Indicative result based on the data you entered. It does not replace a professional quote or your actual bill.

How it is calculated

Quantity in base unit = quantity × factor (1 g = 0.001 kg; 1 oz = 0.02835 kg; 1 lb = 0.4536 kg; 1 fl oz = 0.02957 L; 1 gal = 3.785 L).

Unit price = price ÷ quantity in base unit. Only products in the same group (weight, volume or items) are compared.

Worked example

Using the calculator’s example values:

  • Products to compare: 3 example rows

Result: Best value: Store brand — $5.30/kg (most expensive: small pack: $7.56/kg; difference between cheapest and dearest: 29.9%).

Money-saving tips

  • Look for the unit price on the shelf label and double-check it.
  • Buy large packs only if you will use them before they expire.
  • For canned goods, compare drained weight.

Frequently asked questions

Why won’t it compare grams with litres?

Because weight and volume are not equivalent without knowing the product’s density.

How do I enter a “3 for 2” deal?

Enter the total price you pay and the total quantity you take home.

Which gallon does it use?

The US gallon (3.785 L).

GuideUnit pricing: how to compare products of different sizes

How we calculate and the limits of the results: Methodology.

More food calculators

Recipe cost per serving calculator What each plate costs at your prices. Recipe scaler: ingredients per serving Scale a recipe up or down for more or fewer people. Weekly grocery budget calculator Weekly, monthly and per-person totals by category.