Unit Price Comparator
Check which package, bottle, bag, or subscription option is cheaper by comparing price divided by quantity with a clear best-value result.
Runs locally in your browser. This tool does not upload your input.
Item A
Item B
Results
- Best value
- Family pack
- Difference
- 17.6%
| Name | Unit price | Difference |
|---|---|---|
| Small pack | $0.01 / g | 17.6% |
| Family pack | $0.0085 / g | 0% |
How to compare unit prices
Use the comparator when two package sizes or product options make the cheaper choice hard to see.
What this tool helps with
It divides each price by its quantity and highlights which option gives the lowest cost per unit.
Inputs to prepare
- Enter a name, price, quantity, and unit label for each option.
- The result shows each unit price and how far the other option is from the best value.
- Only compare products with equivalent units, such as grams with grams or liters with liters.
How to use it well
- Start with the sample values, then replace them with your own numbers or text.
- Check the result and adjust assumptions before relying on it.
- Use it as a planning aid, then confirm important outputs in the source system or real-world context.
Privacy
This tool runs locally in your browser. The values you type are used only to update the result on the page.
FAQ
Can I compare grams and kilograms?
Convert them to the same unit first so both quantities mean the same thing.
What does the difference percent mean?
It shows how much more expensive an option is compared with the cheapest unit price.
Does this include shipping or coupons?
Only if you include those adjustments in the price you enter.