Unit Conversion 2026-05-02 4 min read By Konvertibly Team

Pounds to Kilograms: Formula, Reference Table and Converter

Convert pounds to kilograms with the exact formula, reference values from 1 lb to 200 lb, and when you need pounds-to-kg conversion most.

Pounds to Kilograms: The Complete Conversion Guide

Whether you're tracking your weight in a country that uses metric, calculating nutrition on an international app, or shipping goods overseas, converting pounds to kilograms is a daily necessity for millions of people.

The Conversion Formula

kilograms = pounds ÷ 2.20462

Or equivalently: multiply by 0.453592. For a quick mental estimate, divide by 2.2.

Quick Reference Table

1 lb = 0.454 kg
10 lb = 4.536 kg
50 lb = 22.68 kg
100 lb = 45.36 kg
130 lb = 58.97 kg
150 lb = 68.04 kg
200 lb = 90.72 kg

Why the Exact Factor Matters

Using 2.2 instead of 2.20462 introduces a 0.21% error. For body weight this is negligible. For freight, pharmaceutical dosing, or precision engineering, use the exact factor or a calculator.

Common Use Cases

Medical records outside the US — doctors worldwide use kg for weight-based drug dosing
International online shopping and shipping quotes
Fitness apps that default to metric units
Scientific and academic contexts where SI units are required

Convert any weight instantly: Free pounds to kg converter