---
title: "Milligrams to Tonnes — mg to t converter"
description: "1 milligram = 1 × 10^-9 tonnes. Convert milligrams to tonnes with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/mg-to-tonnes/
site: "At One Place"
---

# Milligrams to tonnes

**1 milligram in tonnes: 1 mg = 1 × 10^-9 t**

t = mg × 1 × 10^-9

To convert milligrams to tonnes, multiply by 1 × 10^-9. The table below gives the values people look up most often, and the converter works for any number.

## Milligrams to tonnes table

*Common milligram values converted to tonnes.*

| Milligrams | Tonnes |
| --- | --- |
| 1 mg | 1 × 10^-9 |
| 2 mg | 2 × 10^-9 |
| 3 mg | 3 × 10^-9 |
| 4 mg | 4 × 10^-9 |
| 5 mg | 5 × 10^-9 |
| 10 mg | 1 × 10^-8 |
| 15 mg | 1.5 × 10^-8 |
| 20 mg | 2 × 10^-8 |
| 25 mg | 2.5 × 10^-8 |
| 30 mg | 3 × 10^-8 |
| 40 mg | 4 × 10^-8 |
| 50 mg | 5 × 10^-8 |
| 75 mg | 7.5 × 10^-8 |
| 100 mg | 1 × 10^-7 |
| 250 mg | 2.5 × 10^-7 |
| 500 mg | 5 × 10^-7 |
| 1,000 mg | 0.000001 |

## How the conversion works

The relationship is t = mg × 1 × 10^-9. Both units measure mass, so the conversion is a fixed factor that never changes.

> Tonne: Also called a metric ton.

## Common questions

### How many tonnes are in one milligram?

One milligram equals 1 × 10^-9 tonnes. t = mg × 1 × 10^-9.

### How do you convert milligrams to tonnes?

Use t = mg × 1 × 10^-9. So 10 mg is 1 × 10^-8 t.

### How many milligrams are in one tonne?

One tonne equals 1,000,000,000 milligrams, which is the reverse of the conversion above.

### Is there more than one kind of tonne?

Also called a metric ton.

## Related pages

- [Tonnes to Milligrams](https://atoneplace.net/convert/tonnes-to-mg/)
- [Milligrams to Kilograms](https://atoneplace.net/convert/mg-to-kg/)
- [Milligrams to Grams](https://atoneplace.net/convert/mg-to-grams/)
- [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/)

## 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)
- Calculated on this page — At One Place (/about/)