Convert between grams, kilograms, pounds, ounces, tons, and more. Essential for cooking, shipping, science, and fitness.
Last updated: March 2026 | By Patchworkr Team
Weight conversion (more precisely, mass conversion) is the process of converting measurements of matter from one unit to another. While weight is technically the force of gravity on mass, the terms are used interchangeably in everyday contexts.
The metric system uses grams and kilograms as standard units, while the imperial system uses pounds and ounces. Different industries and regions prefer different units - jewelers use carats, pharmacists use grains, and shipping uses tons.
Accurate weight conversions are essential in cooking, medicine, science, commerce, fitness, and international trade where different measurement systems meet.
Mass is the amount of matter in an object (measured in kg or lb), while weight is the force of gravity on that mass. Mass stays constant, but weight changes with gravity. On Earth, we use these terms interchangeably.
The metric ton (tonne) = 1,000 kg. The US ton (short ton) = 2,000 lb ≈ 907 kg. The Imperial ton (long ton) = 2,240 lb ≈ 1,016 kg. They evolved from different measurement systems.
A stone is a British imperial unit equal to 14 pounds (about 6.35 kg). It's commonly used in the UK and Ireland to measure human body weight, but rarely used elsewhere or in other contexts.
For cooking, 1-2 decimal places is sufficient. For medicine and science, use at least 3-4 decimal places. For precision work (jewelry, chemistry), use the maximum precision available.
No! A weight ounce (avoirdupois ounce) = 28.35 g. A troy ounce (precious metals) = 31.10 g. A fluid ounce measures volume, not weight. Always check which type is meant.
Weight is more accurate and consistent. A cup of flour can vary by 30% depending on how it's packed, but 120g of flour is always 120g. Professional bakers always use weight measurements.
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