Unit Price Calculator
Package value comparison
Compare two offers on one common basis
Result
Calculation summary
Enter values to see the result
Normalized price preview
Product A versus Product B
Formula
unit price = price ÷ normalized total quantity
- Lower-priced option
- Product B
- Difference per comparison unit
- $0.83/kg
- Relative unit-price savings
- 8.3166%
How to use this calculator
- 1Choose whether the products are compared by count, mass, volume, or length.
- 2Enter each product price, quantity per package, package count, and labeled unit.
- 3Choose a common comparison unit and calculate the normalized prices.
Formula
Unit price = entered price ÷ (package quantity × package count), converted to a common unit
Both package quantities are normalized to the selected comparison unit before their prices are divided by quantity.
Calculation steps
- Multiply each package quantity by its package count.
- Convert both totals to the same comparison unit.
- Divide each entered price by its normalized total quantity.
- Compare the unit prices and express the difference relative to the more expensive option.
Worked example
A 500 g package at 4.99 costs 9.98 per kg, while a 600 g package at 5.49 costs 9.15 per kg, making the second package the lower unit price.
Assumptions
- The calculator compares exactly two entered offers.
- Package quantity means usable labeled contents per package.
- Taxes, deposits, coupons, membership requirements, and quality differences are not inferred.
- Currency selection changes formatting only and never converts prices.
Sources
Frequently asked questions
Can the products use different units?
Yes. Compatible units such as grams and pounds or liters and U.S. fluid ounces are normalized before comparison.
How do multipacks work?
Enter the contents of one package and the number of identical packages. The calculator multiplies them before finding the unit price.
Does the lower unit price always mean the better purchase?
Not necessarily. Quality, waste, expiration, deposits, and eligibility for promotions can matter.
Are U.S. fluid ounces and Imperial gallons mixed?
No. Each labeled volume unit has its own conversion factor.