Weight Converters
Convert between metric and imperial mass units including mg, g, kg, metric tons, oz, lb, st, and short tons using fixed kilogram-based definitions.
Scope & Verification
This hub groups related converter families so you can move from the category level to exact routes with one clear basis per page.
- Families are split so exact-factor, profile-based, density-based, and estimate-style pages do not collapse into one generic answer.
- Leaf pages keep calculator, common values, FAQ, and reverse routes aligned to the same assumption.
- Methodology and verification pages document how those assumptions are chosen and checked.
Explanation
The kilogram is the SI base unit of mass used to normalize every factor in this hub. It covers exact metric scaling, avoirdupois units such as ounces and pounds, plus stones and US short tons for everyday, commercial, and industrial mass comparisons. All relationships here are fixed multiplicative definitions with no offsets, so each page and its mirror stay reversible on the same basis.
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 mirror page for the reverse mass conversion.