Weight Converter
Convert between metric and imperial weight units. Select a unit, enter a value, and see instant results for all units simultaneously.
| Unit | Value |
|---|---|
| Milligram (mg) | 1000000 |
| Gram (g) | 1000 |
| Kilogram (kg) | 1 |
| Metric Ton (t) | 0.001 |
| Ounce (oz) | 35.273991 |
| Pound (lb) | 2.204624 |
| Stone (st) | 0.157473 |
| US Ton (short ton) | 0.001102 |
| UK Ton (long ton) | 0.000984 |
How to Convert Weight Units
Weight (or mass) conversion follows the same base-unit method as length conversion: every unit is expressed as a multiple of grams, so converting between any two units requires two multiplications — one to convert to grams, one to convert from grams to the target unit.
Result = Input × (From factor in grams / To factor in grams)
Weight Unit Reference Table
| Unit | Value in grams | Common uses |
|---|---|---|
| Milligram (mg) | 0.001 g | Medication dosages, nutritional labeling |
| Gram (g) | 1 g | Food, chemistry, small items |
| Kilogram (kg) | 1,000 g | Body weight, large food quantities, SI base unit |
| Metric Ton (t) | 1,000,000 g | Bulk shipping, industrial weight |
| Ounce (oz) | 28.3495 g | US cooking, food packaging, jewelry |
| Pound (lb) | 453.592 g | Body weight (US), US packaging |
| Stone (st) | 6,350.29 g | Body weight in UK/Ireland (14 lbs) |
| US Short Ton | 907,185 g | US bulk/freight (2,000 lbs) |
| UK Long Ton | 1,016,047 g | UK/marine (2,240 lbs) |
Common Weight Conversions
The kg-to-lb conversion is by far the most common, particularly for body weight. Here are the most useful reference values:
| From | To | Multiply by | Example |
|---|---|---|---|
| kg | lb | 2.20462 | 70 kg = 154.32 lb |
| lb | kg | 0.453592 | 150 lb = 68.04 kg |
| kg | g | 1,000 | 2.5 kg = 2,500 g |
| oz | g | 28.3495 | 8 oz = 226.8 g |
| g | oz | 0.035274 | 100 g = 3.527 oz |
| lb | oz | 16 | 2.5 lb = 40 oz |
| st | lb | 14 | 11 st = 154 lb |
Body Weight: kg vs. lbs vs. stones
Different countries use different units for body weight. The US uses pounds (lbs), most of the world uses kilograms (kg), and the UK and Ireland traditionally use stones and pounds (e.g., "11 stone 4 lbs"). For medical purposes, kilograms are the universal standard — BMI, drug dosages, and clinical measurements all use kg.
| kg | lbs | stones + lbs |
|---|---|---|
| 50 | 110.2 | 7 st 12 lb |
| 60 | 132.3 | 9 st 6 lb |
| 70 | 154.3 | 11 st 0 lb |
| 80 | 176.4 | 12 st 8 lb |
| 90 | 198.4 | 14 st 2 lb |
| 100 | 220.5 | 15 st 10 lb |
Frequently Asked Questions
How many pounds are in a kilogram?
1 kilogram = 2.20462 pounds. To convert kg to lbs, multiply by 2.20462. To convert lbs to kg, multiply by 0.453592. Example: 70 kg = 70 × 2.20462 = 154.32 lbs.
How many ounces are in a pound?
There are exactly 16 ounces (avoirdupois) in one pound. 1 lb = 16 oz = 453.592 grams. 1 oz = 28.3495 grams.
What is a stone in kilograms?
1 stone = 14 pounds = 6.35029 kg. Stone is primarily used in the UK and Ireland to measure body weight. A person weighing 11 stone 4 pounds = 158 pounds = 71.67 kg.
What is the difference between a US ton and a UK ton?
A US short ton = 2,000 pounds = 907.185 kg. A UK long ton = 2,240 pounds = 1,016.047 kg. A metric ton (tonne) = 1,000 kg = 2,204.62 pounds, which falls between the two.
What is the difference between weight and mass?
Mass is the amount of matter in an object (measured in kg or grams). Weight is the gravitational force on that mass (measured in Newtons). In everyday life and on Earth, people use the terms interchangeably. A 70 kg person has a weight of about 686 Newtons at sea level.
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