Weight Converter
Convert common metric, imperial, and US weight units.
Convert weight and mass
Converted value
1 kg equals 2.20462262185 lb.
Your entries and results stay in this browser. This tool does not send, save, or add them to the page address.
Convert weight and mass units
Enter a value and choose its current and desired units. The converter includes metric units from milligrams through tonnes and commonly used US and imperial units.
Each value is converted through kilograms as the shared base unit. Swapping units reverses the direction and recalculates using the current numeric value.
Exact unit relationships
The international avoirdupois pound is exactly 0.45359237 kilogram, and one ounce is one-sixteenth of a pound. A stone is exactly 14 pounds. These definitions make conversions among pounds, ounces, stones, and kilograms deterministic.
A metric tonne is exactly 1,000 kilograms. This converter labels the 2,000-pound unit as a US short ton to distinguish it from the metric tonne and the 2,240-pound imperial long ton, which is not included.
Measurement precision
Changing units does not improve the quality of the source measurement. Although the calculator retains standard conversion factors and displays up to 12 significant digits, practical results should be rounded to match the scale or measurement method used.
For trade, shipping, medicine, laboratory work, or regulated calculations, confirm the required unit definitions, calibration, and rounding rules for that context.
Frequently asked questions
How many pounds are in one kilogram?
One kilogram equals approximately 2.20462262185 pounds because the international pound is defined as exactly 0.45359237 kilogram.
Is a metric tonne the same as a US ton?
No. A metric tonne is exactly 1,000 kilograms. A US short ton is 2,000 pounds, or 907.18474 kilograms.
How many pounds are in one stone?
One stone equals exactly 14 international pounds, which is 6.35029318 kilograms.
Why does this page say weight and mass?
Kilograms and pounds are units of mass in scientific usage, though everyday language commonly calls the measured quantity weight. This converter applies standard mass conversion factors.