Compare Unit Price: 250ml vs 500ml Shampoo
Calculate the per-ml cost of two shampoo sizes to determine which bottle offers better value for money.
How to use this tool
- Enter price a, weight a, price b and weight b in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your cheaper option saves and the full breakdown beneath it.
Check if buying the larger shampoo bottle is actually cheaper per millilitre than the smaller one.
Frequently asked questions
- How do I compare unit prices?
- Divide each product's price by its weight in grams, then multiply by 100 to get the cost per 100g. The lower figure is better value.