Weight & Mass

Convert pounds, kilograms, ounces, grams and more

Weight conversions come up constantly in cooking, fitness tracking, shipping, and international commerce. The difference between pounds and kilograms, ounces and grams, or stones and kilograms can mean the difference between a perfect recipe and a kitchen disaster, or an accurate shipping quote and an unexpected surcharge.

All Weight & Mass Tools

Pounds ↔ Kilograms

Convert between pounds and kilograms

Ounces ↔ Grams

Convert between ounces and grams

Ounces ↔ Pounds

Convert between ounces and pounds

Stone ↔ Kilograms

Convert between stone and kilograms

Tons ↔ Pounds

Convert between tons and pounds

Pounds to Kilograms: The Definitive Conversion Guide

Everything you need to know about converting between pounds and kilograms, including mental math shortcuts and practical applications.

What Is a Stone? The British Weight Measurement Explained

Understand the stone measurement system still used in the UK and Ireland, and how it relates to pounds and kilograms.

Ounces to Grams: A Cook's Conversion Guide

Master the ounce-to-gram conversion for cooking with practical examples, reference charts, and tips for accuracy.

Pounds, Kilograms, and the Global Standard

The kilogram is the base unit of mass in the International System of Units (SI) and is used by the vast majority of countries. The United States primarily uses pounds for everyday weight measurements, while the United Kingdom uses a mix of stones, pounds, and kilograms depending on the context. One pound equals approximately 0.4536 kilograms, and one stone equals exactly 14 pounds.

Weight in Cooking and Nutrition

Professional bakers and chefs worldwide prefer weight measurements over volume because they are more accurate. A cup of flour can vary by 30 grams depending on how it is scooped, but 125 grams of flour is always 125 grams. Nutrition labels in different countries list serving sizes in grams or ounces, making conversions essential for tracking macros and calories accurately.