Weight Converter

Convert between weight units including kilograms, pounds, ounces, grams, tons, and stone. Free online converter.

Last updated: June 1, 2026

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What is Weight Converter?

A weight (mass) converter translates between metric units (milligrams, grams, kilograms, metric tons), imperial units (ounces, pounds, stones, US/UK tons), and other systems like troy ounces for precious metals. Weight conversion comes up in cooking (grams vs ounces), shipping (kilograms vs pounds), fitness (body weight in stones vs kilograms), manufacturing (metric tons vs short tons), and international commerce where products are measured differently in different markets.

How It Works

Enter a weight value and select source and target units. The tool converts through kilograms as the base unit, applying precise conversion factors: 1 pound = 0.45359237 kg, 1 ounce = 28.349523125 grams, 1 stone = 6.35029 kg, etc. It handles the distinction between avoirdupois ounces (everyday use) and troy ounces (precious metals), and between US short tons (2000 lbs) and UK long tons (2240 lbs). Results show appropriate decimal precision for practical use.

Quick Reference

Metric	Imperial	Conversion
1 gram	0.035 oz	1 oz = 28.35 g
1 kg	2.205 lbs	1 lb = 453.6 g
100 g	3.527 oz	1 stone = 6.35 kg
1 metric ton	2,204.6 lbs	1 US ton = 907.2 kg
500 g	1.102 lbs	1 lb = 16 oz

Common Use Cases

•Converting cooking recipe measurements between metric (grams) and imperial (ounces/pounds)
•Calculating shipping costs by converting package weights between kilograms and pounds
•Converting body weight between kilograms, pounds, and stones for fitness and medical purposes
•Translating precious metal prices between troy ounces and grams for investment calculations
•Converting industrial material weights between metric tons and US/UK tons for trade
•Translating food nutrition labels between metric and imperial measurements