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Compare different pack sizes fairly and see which option gives you more for your money.
Add each option and we will normalise different sizes and multipacks.
Total compared: 500.00 g
Total compared: 1.00 kg
Cheapest unit price ranks first.
Larger pack
£0.55 per 100 g
Save £0.09 per 100 g
14.1% less than Smaller pack.
Larger pack
£5.50 for 1.00 kg
Smaller pack
£3.20 for 500.00 g
For an equivalent kg, the best option costs £5.50.
Choose items, weight or volume, then enter at least two products with their price, size, unit and number of packs. The calculator converts every option to a common base quantity, ranks them by unit cost and highlights the best value.
Weight comparisons can mix grams, kilograms, ounces and pounds. Volume supports millilitres, litres and UK or US fluid ounces. Item mode is useful for multipacks where each pack contains a count rather than a measured amount.
A larger pack is not automatically cheaper. Divide price by the total quantity, then compare equivalent amounts. The result shows a convenient price per item, per 100 g or per 100 ml, plus a larger reference amount and the percentage difference between the best and highest unit cost.
£3.20 for 500 g costs £0.64 per 100 g.
£5.50 for 1 kg costs £0.55 per 100 g, so the larger pack is better value by unit price.
Only compare like-for-like products and include every pack in a multipack offer. The cheapest unit rate may not be best if some product will be wasted, storage is difficult, quality differs or buying more strains the immediate budget. The currency selector formats prices but does not convert between currencies.
FAQs
Select Weight and choose the correct unit for each product. The calculator converts both sizes to grams before comparing unit cost.
Yes. Enter the size of one pack and use the Packs field for the number included in the offer.
It measures how much lower the best unit rate is than the most expensive valid option in the current comparison.
No. It compares price and quantity only; quality, shelf life, waste and personal preference remain separate considerations.