---
title: "Weight and mass converter — every unit"
description: "Convert between every mass unit: kilogram, gram, milligram, tonne, pound and more. Tables, exact formulas and a calculator."
url: https://atoneplace.net/convert/mass/
site: "At One Place"
---

# Weight and mass conversions

Every mass unit on the site, and every conversion between them. Each page shows a full table, the exact formula and a live calculator.

## All mass units

*Every mass unit and its size relative to the base unit.*

| Unit | Symbol | In kilogram |
| --- | --- | --- |
| kilogram | kg | 1 |
| gram | g | 0.001 |
| milligram | mg | 0.000001 |
| microgram | µg | 1 × 10^-9 |
| tonne | t | 1,000 |
| pound | lb | 0.45359237 |
| ounce | oz | 0.02834952313 |
| stone | st | 6.35029318 |
| short ton | ton | 907.18474 |
| long ton | long ton | 1,016.046909 |
| carat | ct | 0.0002 |
| grain | gr | 0.00006479891 |

## Common conversions

- [Kilograms to Grams](https://atoneplace.net/convert/kg-to-grams/)
- [Kilograms to Milligrams](https://atoneplace.net/convert/kg-to-mg/)
- [Kilograms to Tonnes](https://atoneplace.net/convert/kg-to-tonnes/)
- [Kilograms to Pounds](https://atoneplace.net/convert/kg-to-lbs/)
- [Kilograms to Ounces](https://atoneplace.net/convert/kg-to-oz/)
- [Kilograms to Stone](https://atoneplace.net/convert/kg-to-stone/)
- [Grams to Kilograms](https://atoneplace.net/convert/grams-to-kg/)
- [Grams to Milligrams](https://atoneplace.net/convert/grams-to-mg/)
- [Grams to Tonnes](https://atoneplace.net/convert/grams-to-tonnes/)
- [Grams to Pounds](https://atoneplace.net/convert/grams-to-lbs/)
- [Grams to Ounces](https://atoneplace.net/convert/grams-to-oz/)
- [Grams to Stone](https://atoneplace.net/convert/grams-to-stone/)
- [Milligrams to Kilograms](https://atoneplace.net/convert/mg-to-kg/)
- [Milligrams to Grams](https://atoneplace.net/convert/mg-to-grams/)
- [Milligrams to Tonnes](https://atoneplace.net/convert/mg-to-tonnes/)
- [Milligrams to Pounds](https://atoneplace.net/convert/mg-to-lbs/)
- [Milligrams to Ounces](https://atoneplace.net/convert/mg-to-oz/)
- [Milligrams to Stone](https://atoneplace.net/convert/mg-to-stone/)
- [Tonnes to Kilograms](https://atoneplace.net/convert/tonnes-to-kg/)
- [Tonnes to Grams](https://atoneplace.net/convert/tonnes-to-grams/)
- [Tonnes to Milligrams](https://atoneplace.net/convert/tonnes-to-mg/)
- [Tonnes to Pounds](https://atoneplace.net/convert/tonnes-to-lbs/)
- [Tonnes to Ounces](https://atoneplace.net/convert/tonnes-to-oz/)
- [Tonnes to Stone](https://atoneplace.net/convert/tonnes-to-stone/)
- [Pounds to Kilograms](https://atoneplace.net/convert/lbs-to-kg/)
- [Pounds to Grams](https://atoneplace.net/convert/lbs-to-grams/)
- [Pounds to Milligrams](https://atoneplace.net/convert/lbs-to-mg/)
- [Pounds to Tonnes](https://atoneplace.net/convert/lbs-to-tonnes/)
- [Pounds to Ounces](https://atoneplace.net/convert/lbs-to-oz/)
- [Pounds to Stone](https://atoneplace.net/convert/lbs-to-stone/)
- [Ounces to Kilograms](https://atoneplace.net/convert/oz-to-kg/)
- [Ounces to Grams](https://atoneplace.net/convert/oz-to-grams/)
- [Ounces to Milligrams](https://atoneplace.net/convert/oz-to-mg/)
- [Ounces to Tonnes](https://atoneplace.net/convert/oz-to-tonnes/)
- [Ounces to Pounds](https://atoneplace.net/convert/oz-to-lbs/)
- [Ounces to Stone](https://atoneplace.net/convert/oz-to-stone/)
- [Stone to Kilograms](https://atoneplace.net/convert/stone-to-kg/)
- [Stone to Grams](https://atoneplace.net/convert/stone-to-grams/)
- [Stone to Milligrams](https://atoneplace.net/convert/stone-to-mg/)
- [Stone to Tonnes](https://atoneplace.net/convert/stone-to-tonnes/)
- [Stone to Pounds](https://atoneplace.net/convert/stone-to-lbs/)
- [Stone to Ounces](https://atoneplace.net/convert/stone-to-oz/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)