Kilogram to Milligram (kg to mg)
Result
1,000,000 Milligram
Formula
mg = kg × 1,000,000
1 kg = 1,000,000 mg, and 1 mg = 0.000001 kg.
The kilogram is the SI base unit of mass, defined through the Planck constant since 2019. The international avoirdupois pound is exactly 0.45359237 kg; the ounce is 1/16 lb and the stone 14 lb.
Worked examples
- 1 kg × 1,000,000 = 1,000,000 mg
- 10 kg × 1,000,000 = 10,000,000 mg
- 100 kg × 1,000,000 = 100,000,000 mg
Common mistakes
- Precious metals use the troy ounce (31.1034768 g), about 10% heavier than the avoirdupois ounce (28.349523125 g) used for food and parcels.
- "Ton" is ambiguous: the metric tonne used here is 1,000 kg, the US short ton 907.18474 kg and the UK long ton 1,016.0469088 kg.
- Kilograms and pounds measure mass. Pound-force (lbf) and newtons measure force — they are not interchangeable with kg.
Kilogram to Milligram table
| Kilogram (kg) | Milligram (mg) |
|---|---|
| 1 | 1,000,000 |
| 2 | 2,000,000 |
| 5 | 5,000,000 |
| 10 | 10,000,000 |
| 20 | 20,000,000 |
| 50 | 50,000,000 |
| 100 | 100,000,000 |
| 1,000 | 1,000,000,000 |
The units
- Kilogram (kg)
- The SI base unit of mass, defined through the Planck constant since May 2019.
- Milligram (mg)
- One millionth of a kilogram (0.001 g).
Sources for these factors
- The International System of Units (SI Brochure), 9th edition — BIPM
- Handbook 44 (2024), Appendix C: General Tables of Units of Measurement — NIST
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy