Weight Converters
Convert between metric and avoirdupois weight units with the kilogram as the SI base reference. This hub supports everyday and industrial mass workflows using fixed metric and imperial definitions.
Explanation
The kilogram is the SI base unit of mass used to normalize all weight factors in this hub. Exact fixed definitions include 1 metric ton = 1000 kg and 1 pound = 0.45359237 kg exactly. All ratios are derived from these legally defined relationships and are purely multiplicative with no offsets. For clarity, weight conversions are grouped into metric core, imperial system, and cross-system relationships.
Weight pages are organized by conversion direction so mirror leaves remain aligned and comparable.
Read more
Open a family hub to reach leaf pages with direct answers, calculator output, and reverse links built on the same constants.
Frequently Asked Questions
What is the SI base unit of mass?
The SI base unit of mass is the kilogram (kg).
Are pounds defined exactly?
Yes. The avoirdupois pound is fixed exactly at 0.45359237 kilograms.
What is the difference between metric ton and short ton?
A metric ton equals 1000 kg, while a US short ton equals 2000 pounds, so they are different fixed units.
How do I reverse the conversion?
Use the switch button or open the reverse family to load the mirror page.