Unit Price Calculator — Compare Price Per Unit
Compare the unit price of two products to find the better deal. Works with weight, volume, or count units. See also our Percentage Calculator and Discount Calculator.
Item A
Item B
How to Compare Unit Prices
- Enter the price and quantity for Item A.
- Select the unit of measurement (oz, lb, g, kg, ml, L, or count).
- Enter the price and quantity for Item B with its unit.
- Click Calculate to see which item offers better value.
- The calculator handles unit conversion automatically when units differ.
Formula
Unit Price = Total Price / Quantity
Savings % = (Higher Unit Price - Lower Unit Price) / Higher Unit Price × 100
Savings per Unit = |Unit Price A - Unit Price B|Example
Item A: $5.99 for 32 oz vs Item B: $8.49 for 64 oz:
Unit Price A = $5.99 / 32 = $0.1872/oz
Unit Price B = $8.49 / 64 = $0.1327/oz
Better Value: Item B
Savings = ($0.1872 - $0.1327) / $0.1872 × 100 = 29.1%
Common Unit Conversions
| From | To | Factor |
|---|---|---|
| 1 lb | oz | 16 |
| 1 kg | g | 1,000 |
| 1 lb | g | 453.6 |
| 1 oz | g | 28.35 |
| 1 L | ml | 1,000 |
| 1 gallon | oz (fluid) | 128 |
| 1 kg | lb | 2.205 |
Frequently Asked Questions
Is the bigger size always cheaper per unit?
Not always. While bulk sizes often have lower unit prices, some stores price smaller packages competitively during sales. Always calculate the unit price to be sure.
Should I always buy the cheaper unit price?
Consider shelf life, storage space, and actual usage. A lower unit price is not a savings if the product expires before you use it all.
How do stores display unit prices?
Most US grocery stores show unit prices on shelf tags. However, they may use different units for similar products, making direct comparison difficult without a calculator.
Can I compare items with different units?
Yes, this calculator converts between weight and volume units automatically. However, comparing weight to volume (like oz to ml) requires knowing the product density.
What about quality differences between brands?
Unit price only measures cost efficiency. Consider quality, ingredients, brand reputation, and personal preference alongside price when making purchasing decisions.