About the Price per Weight Calculator
This calculator finds the unit price of a product — the cost per pound, per kilogram, per ounce, or per 100 grams — so you can compare packages of different sizes, brands, or stores on equal footing. Enter the price and weight for one product to see its unit price, or add a second product to compare the two directly.
The formula
Unit price uses one simple relationship:
- Unit price = Total price ÷ Total weight
Because packages are labeled in different units — grams, kilograms, ounces, or pounds — this calculator first converts every weight to grams using standard conversions (1 lb = 453.59237 g, 1 oz = 28.349523 g, 1 kg = 1,000 g), then reports the price per pound, per kilogram, and per 100 grams so any two products can be compared regardless of how their labels are written.
Getting accurate results
- Use the exact price on the shelf tag or receipt, and the exact net weight printed on the package — not the container size or drained weight for canned goods.
- Double-check the weight unit. Confusing ounces (a mass unit) with fluid ounces (a volume unit) is one of the most common sources of unit-price errors.
- If you want tax, shipping, or a coupon reflected in the comparison, adjust the price you enter before calculating; the tool does not add these automatically.
Using the result
A lower price per pound, per kilogram, or per 100 g means a better deal on a pure cost-per-weight basis. But unit price does not account for quality, freshness, brand, or how much of the product you will actually use before it spoils — a cheaper bulk size is only a good deal if you can use it before it goes to waste.