🏷️ Unit Price Calculator
Compare products by price per ounce, gram, liter, or item — even across different package sizes and units — to see which is the better deal.
How the Unit Price Calculator Works
Larger packages are often, but not always, cheaper per unit. The unit price — price divided by quantity — lets you compare items of different sizes on equal terms. This calculator converts each product to a common unit within its family (weight, volume, or count), so you can compare a package in ounces with one in grams, or fluid ounces with liters.
Enter up to four products. The lowest unit price is highlighted, along with how much cheaper it is per unit than each alternative. Products in different families, such as grams and liters, cannot be compared directly, and the calculator will tell you. Remember that the best unit price is only a good deal if you will use the full quantity before it spoils or expires.
Formula
Unit price = price ÷ quantity (in a common unit) Weight: 1 oz = 28.3495 g · 1 lb = 16 oz = 453.592 g · 1 kg = 1,000 g Volume: 1 US fl oz = 29.5735 mL · 1 L = 1,000 mL · 1 US gallon = 3.78541 L Costs more than the best by (%) = (item unit price − best unit price) ÷ best unit price × 100
How to Use It
- Enter the price and quantity of each product.
- Choose the unit for each product (weight, volume, or count).
- See each product’s unit price in a common unit.
- Compare against the highlighted lowest unit price.
Frequently Asked Questions
How do you calculate unit price?
Divide the price by the quantity. A 16 oz box for 4.80 costs 0.30 per ounce; a 24 oz box for 6.60 costs 0.275 per ounce, so the larger box is cheaper per unit.
Can I compare ounces and grams?
Yes. The calculator converts both to the same unit before comparing. It cannot compare weight with volume, because that depends on the product’s density.
Is the bigger package always cheaper?
No. Promotions and pack sizes vary, and sometimes a smaller package or a multi-pack has the lower unit price. Comparing unit prices shows which is actually cheaper.
Are fluid ounces the same as ounces?
No. Fluid ounces measure volume and ounces measure weight. The calculator keeps them in separate families.
Related Glossary Terms
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Formula and content last reviewed: September 2026. All calculations run in your browser — nothing you enter is sent to or stored on our servers.
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See all →✔ Reviewed by GelirLab Editöryal Ekibi · Last reviewed: September 2026 · How we check our calculators