Weight and Mass Converter

Convert between kilograms, pounds, ounces, grams, stones, milligrams, tons, and metric tons.

Weight and Mass Converter tool

Loading...

Example

Input: 200 pounds (lb) to kilograms (kg)

Result: 90.718474 kg

One pound is defined as exactly 0.45359237 kg, so 200 x 0.45359237 = 90.718474 kg.

Common Weight Conversions

FromTo
1 kilogram2.204623 lb
1 pound0.453592 kg
1 pound16 oz
1 ounce28.349523 g
100 grams3.527396 oz
500 grams1.102311 lb
1 stone14 lb
1 stone6.350293 kg
70 kg154.323584 lb
70 kg11.023113 st
150 lb68.038855 kg
1 US ton907.18474 kg
1 metric tonne2,204.622622 lb

Values from this converter, rounded to 6 decimal places.

  1. Choose the weight unit you are converting from (e.g., kilograms, pounds, stones).
  2. Enter the weight or mass value into the input field.
  3. Instantly see equivalent values in all other weight units - kg, lb, oz, g, st, mg, tons.
  4. Use the swap button to quickly reverse your conversion direction.
  5. Copy any converted result to your clipboard with a single click.

Kilograms, Pounds and Stones Explained

One kilogram is about 2.2 pounds (2.204623 lb to be exact), and one pound is exactly 0.45359237 kg. This converter switches between kilograms, pounds, ounces, grams, stones, milligrams, US tons and metric tonnes. It lists the answer in every unit at once, so you can read off whatever you need.

Body weight is where most people need this. The US uses pounds, the UK often uses stones, and most other countries use kilograms. One stone is 14 pounds, or 6.35 kg. A person who weighs 70 kg weighs 154.3 lb, or just over 11 stone. If you track your weight, the BMI Calculator accepts both metric and imperial units.

Three pitfalls cause most mistakes. The first is the word "ton". Here it means the US short ton of 2,000 lb, while a metric tonne is 1,000 kg and about 10 percent heavier. The second is the ounce. This tool uses the everyday ounce of 28.35 g, not the troy ounce used for gold. The third is mixing weight with volume. A fluid ounce measures space, not weight, and a cup of flour weighs less than a cup of sugar. For recipes that list cups, use the Cooking Measurement Converter, which allows for each ingredient.

Formula / How It Works

1 kg = 2.20462 lb = 35.274 oz = 1000 g = 0.157473 st = 1,000,000 mg = 0.00110231 short ton = 0.001 metric ton

Sources

Frequently Asked Questions

One kilogram is 2.204623 pounds. For a quick estimate, double the kilograms and add 10 percent. For 70 kg that gives 140 + 14 = 154 lb, and the exact answer is 154.32 lb. To go from pounds to kilograms, multiply by 0.45359237, which is exactly how the pound is defined.
A US ton (short ton) is 2,000 pounds, or 907.18 kg. A metric tonne is 1,000 kg, or 2,204.62 pounds, so it is about 10 percent heavier. The UK long ton of 2,240 pounds (1,016.05 kg) is a third unit. It is not in this converter, so convert it through pounds.
Turn the whole weight into pounds first. Multiply the stones by 14 and add the extra pounds. For 11 st 2 lb that is 11 x 14 + 2 = 156 lb. Then convert pounds to kilograms, which gives 70.76 kg. Stones are still common for body weight in the UK and Ireland.
One ounce is 28.349523 grams, so 100 grams is about 3.53 ounces. This is the everyday (avoirdupois) ounce used for food and parcels. Gold and silver are weighed in troy ounces of about 31.1 grams, which this tool does not use. Fluid ounces measure volume, not weight.
Not strictly. Mass is the amount of matter in something and is measured in kilograms. Weight is the pull of gravity on that mass. On Earth, scales show mass in kilograms or pounds, so in daily life the two words mean the same thing. This converter works with those everyday mass units.

Related Tools

Length Converter

Convert between meters, feet, inches, centimeters, kilometers, miles, yards, and nautical miles instantly.

Unit Converters

Volume Converter

Convert between liters, gallons, fluid ounces, milliliters, cups, tablespoons, teaspoons, pints, and quarts.

Unit Converters

BMI Calculator

Calculate your Body Mass Index with a visual scale showing underweight, normal, overweight, and obese categories.

Health and Fitness

Cooking Measurement Converter

Convert between cups, tablespoons, teaspoons, milliliters, grams, and ounces by ingredient density.

Cooking and Lifestyle

Recipe Scaler

Scale recipe ingredients up or down by number of servings with smart fraction rounding for easy measuring.

Cooking and Lifestyle

Shoe Size Converter

Convert shoe sizes between US, UK, EU, and JP sizing systems for men, women, and children.

Cooking and Lifestyle