Unit Price Calculator
Enter the price and quantity of two package options — any product, any unit (ounces, count, liters) — to find out which one actually costs less per unit.
How the Unit Price formula works
A simple price-per-unit comparison:
Unit price = Price / Quantity
Step-by-step calculation
- Divide each package's price by its quantity to get a price per unit.
- Compare the two unit prices directly — the lower one is the better deal, regardless of the total price or package size.
Worked example
A 12 oz bottle for $3.99 vs. an 20 oz bottle for $5.99: Option A = 3.99/12 ≈ $0.333/oz. Option B = 5.99/20 ≈ $0.300/oz. Despite costing more upfront, Option B is the better per-ounce value.
Frequently asked questions
Why don't stores always show unit price clearly?
Many grocery stores are required to display unit pricing on shelf tags, but formats and units used can vary between products (per ounce vs. per count vs. per 100g), making direct comparison harder without converting to the same unit yourself.
Does the better unit price always mean the better overall choice?
Not necessarily — consider whether you'll actually use the larger quantity before it expires or goes to waste, since a lower unit price only saves money if the product gets used.