Weight Converter
Convert between different weight units quickly and accurately.
Result
0.454
Kilograms (kg)
Common Weight Conversions
1 kg = 2.205 lb
1 lb = 453.6 g
1 oz = 28.35 g
1 st = 6.35 kg
Frequently Asked Questions
How do I convert kilograms to pounds?
To convert kg to lb, multiply the kilogram value by 2.20462. For example, 10 kg = 10 × 2.20462 = 22.046 lb.
What is the difference between mass and weight?
Mass is the amount of matter in an object, while weight is the force of gravity on that mass. On Earth, they are often used interchangeably, but in space they are very different.
How many grams are in an ounce?
1 ounce equals 28.3495 grams. This is useful for cooking measurements and international product specifications.
Overview
Weight and mass are used interchangeably in daily life, but they are not the same thing in physics. Mass is the amount of matter in an object, measured in kilograms in SI units, and stays the same on the Moon as on Earth. Weight is the force that gravity exerts on that mass, and changes with the local gravitational field. A bathroom scale actually reads weight but is calibrated in mass units, which works only because gravity at Earth's surface is treated as constant. The weight-converter on this page uses standard Earth-surface values, which is what every kitchen scale, gym scale, and recipe is built on.
The metric side covers milligram (mg), gram (g), kilogram (kg), and metric ton (t). The imperial / US customary side covers ounce (oz), pound (lb), and stone (st, equal to 14 lb, still common in the UK and Ireland for body weight). A useful set of reference points: 1 kg = 1,000 g = 2.2046 lb, 1 lb = 453.592 g = 16 oz, and 1 stone = 6.3503 kg. Because the units scale cleanly by powers of ten on the metric side, most cross-system conversions are easiest done through the kilogram: pounds to grams, multiply by 453.592; grams to ounces, divide by 28.3495.
Two specialty units matter in their own domains. The troy ounce (oz t), used for precious metals, is about 31.1035 g, which is heavier than the avoirdupois ounce (28.3495 g). Gold and silver prices are quoted per troy ounce, so a gold bar marked 1 oz t weighs about 1.097 regular ounces. The carat (ct), used for gemstones, is 200 mg exactly; a 1-carat diamond is 0.2 g. Mixing these up with the everyday ounce or gram is one of the most common pricing errors in jewelry and bullion work.
For practical use, type a value in any field and the other units update at the same precision. A 70 kg adult, for instance, is 154.32 lb or 11 st 6.3 lb. The form does not adjust for local gravity, so readings taken on a scale at high altitude versus sea level, or on different planets, are treated as the same mass.
How to use
- Type a value in any field, including metric (mg, g, kg, t), imperial (oz, lb, st), or specialty (troy oz, carat).
- Read the matching values in the other units; the conversion factors are applied automatically.
- Switch between troy ounces and avoirdupois ounces when working with precious metals or gemstones.
- Use the swap and clear controls to reset the form or reverse a conversion direction.
Formula
Interpreting your results
The decimal places in the answer reflect the precision of the input. A 70 kg person shows as 154.324 lb, while 70.0 kg shows the same to one extra digit. For body weight, pounds are often expressed as stones-and-pounds in the UK: 154 lb is 11 st 0 lb, and 154.32 lb is 11 st 0.32 lb. For shipping and freight, kg × 2.205 is the standard hand conversion to pounds, and a metric ton (1,000 kg) is about 1.102 short tons or 0.984 long tons.