Mass and Weight Converter for the Classroom
Convert ounces, pounds, milligrams, grams and kilograms.
About this mass and weight converter
This converter turns ounces and pounds into milligrams, grams and kilograms and back. The pound is defined as exactly 0.45359237 kilograms, and an ounce is one sixteenth of a pound.
Strictly, kilograms and grams measure mass, while pounds and ounces in everyday use stand for weight on Earth. For classroom conversions the two are used interchangeably.
For a printable reference, see the measurement conversion chart.
How to use it
- Type a value.
- Choose the unit you are converting from and the unit you want.
- Read the result.
- Press Swap to reverse it.
- Copy the link to share the conversion.
Classroom tips
- Use a paperclip as roughly one gram and a can of soup as roughly 400 grams to build a feel for the units.
- Have students weigh lunch items at home in ounces or grams and bring in the numbers.
- Remember that one kilogram is about 2.2 pounds.
- Ask which is the better unit for a feather, a backpack and a car.
Reviewed 2026-10-03. Conversion factors are exact definitions.
Frequently asked questions
Are mass and weight the same thing?
No. Mass is how much matter an object has; weight is the force of gravity on it. In everyday classroom use, pounds and kilograms are both treated as weights, so the conversion is the one students need.
How many grams are in a pound?
A pound is exactly 453.59237 grams.
Are ounces here fluid ounces?
No. These are ounces of mass. Fluid ounces are a unit of volume and are on the volume converter.
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