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Convert between different weight and mass units
Convert weight measurements between units instantly with our free online weight converter. This tool helps cooks, scientists, and travelers convert between kilograms, pounds, ounces, grams, and more. Simply enter a value and get conversions to all weight units in real-time.
• 1 kilogram = 2.20462 pounds
• 1 pound = 0.453592 kilograms
• 1 pound = 16 ounces
• 1 ounce = 28.3495 grams
• 1 stone = 14 pounds
• 1 metric ton = 1000 kilograms
Convert between metric (grams, kilograms, etc.) and imperial (pounds, ounces, etc.) weight/mass units.
Supported units:
Weight/mass converter transforms between metric (grams, kilograms), imperial (pounds, ounces), and specialized units (stone, troy ounces). Critical for cooking, shipping, fitness tracking, jewelry, and international commerce where different weight systems are used.
All weights convert through a base unit (grams or kilograms). Input value × conversion factor to base, then base × conversion factor to target. For example: 1 pound = 453.592 grams, so 2.5 pounds = 1133.98 grams = 1.134 kilograms.
The SI base unit for mass is the kilogram (kg). Key factors: 1 pound (lb) = 453.59237g (exact), 1 ounce (oz) = 28.349523g, 1 stone = 6.35029kg, 1 troy ounce = 31.1035g (for precious metals). Note: weight (force) vs mass (amount of matter) differ but are used interchangeably colloquially.
Convert between US recipes (cups/oz) and metric (grams).
8 oz flour = 226.8 gramsConvert body weight between pounds and kilograms for different apps.
Calculate shipping costs when carriers use different weight units.
Convert troy ounces (gold/silver) to grams or regular ounces.
1 troy oz gold = 31.1gconst weightToGrams = {
gram: 1,
kilogram: 1000,
milligram: 0.001,
pound: 453.59237,
ounce: 28.349523125,
stone: 6350.29318,
'troy-ounce': 31.1034768,
tonne: 1000000
};
function convertWeight(value, fromUnit, toUnit) {
const grams = value * weightToGrams[fromUnit];
return grams / weightToGrams[toUnit];
}
// Examples
convertWeight(1, 'pound', 'kilogram'); // 0.4536
convertWeight(1, 'troy-ounce', 'gram'); // 31.1035
convertWeight(70, 'kilogram', 'stone'); // 11.023Convert through grams as intermediate. Handle troy ounces separately for precious metals.
Use weight converter for cooking, fitness tracking, shipping calculations, precious metal transactions, and medical dosages based on body weight.
Regular ounce = 28.35g, troy ounce = 31.1g. Troy ounces are used for precious metals. A troy ounce is heavier but there are only 12 troy ounces in a troy pound.