Weight Converter
Our free volume & weight converter handles weight conversions. See tables, ratios, and examples for quick reference.
Reviewed by Manoj Kumar, Mathematics Educator
Formula
Target = Value x (Source g factor / Target g factor)
All weight conversions pass through grams as the base unit. Each unit has a fixed factor to grams: 1 kg = 1000 g, 1 lb = 453.592 g, 1 oz = 28.3495 g, 1 st = 6350.29 g. To convert between any two units, multiply the input by its gram factor, then divide by the target gram factor.
Worked Examples
Example 1: Gold Weight Conversion
Problem:Convert 5 troy ounces of gold to grams and regular ounces.
Solution:Grams: 5 x 31.1035 = 155.5175 g\nKilograms: 155.5175 / 1000 = 0.1555 kg\nAvoirdupois ounces: 155.5175 / 28.3495 = 5.4857 oz
Result:5 troy oz = 155.52 g = 5.49 regular oz
Example 2: Shipping Weight
Problem:A package weighs 35 pounds. Convert to kilograms and ounces.
Solution:Kilograms: 35 x 0.453592 = 15.8757 kg\nGrams: 15,875.72 g\nOunces: 35 x 16 = 560 oz
Result:35 lb = 15.88 kg = 560 oz
Frequently Asked Questions
What is the difference between mass and weight?
Mass measures the amount of matter in an object and is measured in kilograms, while weight is the gravitational force on that mass and is technically measured in newtons. On Earth, a 1 kg mass weighs about 9.81 newtons. In everyday language, mass and weight are used interchangeably since all measurements are taken on Earth. The distinction becomes important in physics and space travel where gravitational fields differ.
How do I convert between metric and imperial weight units?
The key conversion factors are: 1 kg = 2.20462 lb, 1 lb = 0.453592 kg, 1 oz = 28.3495 g, and 1 stone = 14 lb = 6.35029 kg. For quick mental math, double kilograms and add 10% to get pounds, or halve pounds and subtract 10% to get kilograms. This converter handles all these conversions automatically for twelve different weight units including specialized units like carats and grains.
References
Reviewed by Manoj Kumar, Mathematics Educator · Editorial policy