Your figures
Result
How this calculator works
Shelf prices are hard to compare when pack sizes differ, so this tool reduces each option to a single figure: total price divided by quantity. Enter a price and a quantity for option A and, if you are comparing, the same for option B. The result names the cheaper option per unit and the percentage gap between them, and it also prices option B's quantity at option A's unit rate so the difference is visible in money, not just in decimals.
The unit can be anything consistent — grams, litres, sheets, capsules, hours. What matters is that both quantities are measured the same way. Suppliers know buyers compare lazily, which is why a “bigger value pack” sometimes carries a higher unit price than the small one: the packaging does the persuading while the arithmetic says otherwise.
Good practice and limits
Unit pricing decides purchasing, not product choice. A cheaper unit price on something that expires before you use it, or that your customers like less, is not a saving. Use this for like-for-like comparisons — same product, same specification, different pack — and let quality arguments happen separately, with their own numbers.