TOOLConvert weight and mass units
Switch between metric and imperial weight units in an instant — milligrams, grams, kilograms and tonnes alongside ounces, pounds and stones. It's the quick answer for a recipe, a parcel, a gym goal or a country that uses different units, with the conversion rate shown right below the result.
Common weight conversions
The pound is defined as exactly 453.59237 grams, so the metric-imperial conversions here are exact.
How to convert weight by hand
Weight (strictly, mass) conversions are single multiplications by a fixed factor. Two worked examples:
- 75 kilograms to pounds: 75 × 2.20462 = 165.3 lb.
- 10 stone to kilograms: 10 × 6.35029 = 63.5 kg (1 stone = 14 lb).
Handy anchors to memorise: a kilogram is about 2.2 pounds, and a pound is about 454 grams. Those let you estimate a conversion before you even reach for the tool.
Weight conversions in everyday life
These come up with body weight (kg vs pounds or stone), cooking (grams vs ounces), shipping and luggage limits, and gym plates. The UK still commonly uses stone for body weight while North America uses pounds and most of the world uses kilograms, so a single measurement often needs three different expressions.
Tracking body weight for fitness? Pair this with the BMI calculator and ideal weight calculator, or switch to the length converter. For the most-searched case, see kg to lbs.
Frequently asked questions
How many pounds are in a kilogram?
One kilogram equals about 2.20462 pounds. To convert kilograms to pounds, multiply by 2.20462; to convert pounds to kilograms, divide by 2.20462.
How many pounds are in a stone?
One stone equals exactly 14 pounds. Stones are mainly used in the UK and Ireland for body weight, so 10 stone is 140 pounds, or about 63.5 kg.
Is weight the same as mass?
In everyday use they are treated the same, and units like kg and lb measure mass. Strictly, mass is the amount of matter and weight is the force of gravity on it, but this converter handles the common mass units people mean by weight.