Unit Price Comparison Calculator
Compare unit prices for up to three package sizes to find the best value per gram, litre, item or any unit.
Your inputs
Results
Best value
Option B
- Option A per 100
- $0.9980
- Option B per 100
- $0.8490
- Saving of best vs worst per unit
- 14.93%
✓Exact calculation — rounded only for display
What this calculator does
Bigger is not always cheaper. Comparing price per unit shows which option is really the best deal.
Formula and method
Unit price = price ÷ quantity, shown per the base quantity you choose (e.g. per 100 g).
Worked example
Calculated by this tool with its default inputs:
Inputs
- Option A — price: 4.99 (any currency)
- Option A — quantity: 500
- Option B — price: 8.49 (any currency)
- Option B — quantity: 1000
- Option C — price (optional): 0 (any currency)
- Option C — quantity: 1
- Show price per: 100
Results
- Best value: Option B
- Option A per 100: 0.998
- Option B per 100: 0.849
- Saving of best vs worst per unit: 14.93%
How to read the results
The saving compares the best and worst unit prices.
Assumptions and limitations
- Use the same unit for every quantity.
Questions
What if the bigger pack goes to waste?
Only count what you will actually use; waste makes a lower unit price meaningless.
Methodology and verification
- Result type
- Exact mathematical calculation (rounded only for display)
- Formula version
- 1.0
- Automated verification
- 3 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
- Editorial review
- Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.
Privacy
Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Inputs are added to a share link only if you choose to include them. Privacy policy