Weight and Mass Converter

Convert between kilograms, pounds, grams, ounces, tons, and other weight units.

About this tool

From measuring body weight in pounds or stone to weighing ingredients in grams or ounces, the Weight Converter handles all common mass and weight units. Instant, precise conversions.

How the Weight and Mass Converter works

The Weight Converter converts between 7 weight/mass units: kilogram (kg), gram (g), milligram (mg), metric ton (t), pound (lb), ounce (oz), and stone (st). It uses exact conversion factors based on the international avoirdupois pound (1 lb = 0.45359237 kg).

How to use this tool

Enter the value you want to convert.
Select the source unit from the 'From' dropdown.
Select the target unit from the 'To' dropdown.
Click 'Convert' to see the result.

Common use cases

Converting body weight from kg to lbs or stone

Converting recipe ingredient weights between metric and imperial

Calculating shipping weight in different unit systems

Converting nutritional information from grams to ounces

Examples

70 kg = 154.3 lbs = 11 stone. 1 lb = 453.6 g. 1 oz = 28.35 g.
500 g = 1.1 lbs. 1 metric ton = 2,204.6 lbs = 1,000 kg.

Tips & best practices

Quick kg-to-lbs mental math: double the kg and add 10%. 70 kg → 140 + 14 = 154 lbs (exact: 154.3).
Stone is used primarily in the UK and Ireland for body weight. 1 stone = 14 lbs = 6.35 kg.
There are 16 ounces in a pound. For small weights, grams and ounces are the most practical units.

Common mistakes to avoid

❌ Confusing ounces (weight) with fluid ounces (volume) — they are different units for different purposes.

❌ Using the wrong pound definition — the international avoirdupois pound (453.59237 g) is the standard. Troy pounds (373.24 g) are used only for precious metals.