Milligrams to Tonnes
Convert milligrams to tonnes instantly — one milligram is 1e-09 tonnes.
| Milligrams | Tonnes |
|---|---|
| 1 mg | 1e-09 t |
| 2 mg | 2e-09 t |
| 3 mg | 3e-09 t |
| 5 mg | 5e-09 t |
| 10 mg | 1e-08 t |
| 25 mg | 2.5e-08 t |
| 50 mg | 5e-08 t |
| 100 mg | 1e-07 t |
How to use
- Enter a value in the Milligrams field.
- The Tonnes figure appears immediately — no button to press.
- Typing in the Tonnes field converts back to Milligrams the same way.
- Use the reference table for the values that come up most often.
Milligrams to Tonnes formula
The factor from milligrams to tonnes is 1e-09.
t = mg × 1e-09
Why this factor: the milligram and the tonne are both defined against the kilogram, so dividing one definition by the other gives 1e-09 directly. Both definitions are set out in full below.
To go the other way, divide by 1e-09 — or use the Tonnes to Milligrams converter, which is the same calculation reversed.
Worked example
Given 2 mg, multiplying by 1e-09 yields 2e-09 t.
2 mg × 1e-09 = 2e-09 t
The converter above does this for any value you type, in either direction.
What is a milligram?
A milligram is one thousandth of a gram — the standard unit for drug doses and micronutrients.
Definition: Exactly 1×10⁻⁶ kilogram by SI prefix definition.
Where it is used: Medication dosages, vitamin and mineral content, and analytical chemistry.
What is a tonne?
A tonne, or metric ton, is 1,000 kilograms — the standard unit for bulk freight and industrial quantities.
Definition: Exactly 1,000 kilograms. Accepted for use with SI but not itself an SI unit.
Where it is used: Shipping and freight, steel and cement output, vehicle masses, and carbon emissions accounting.
Worth knowing: Distinct from the US short ton (2,000 lb ≈ 907 kg) and the UK long ton (2,240 lb ≈ 1,016 kg).
Milligrams vs Tonnes
The milligram and the tonne belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many tonnes are in a milligram?
One milligram equals 1e-09 tonnes.
What is the formula to convert milligrams to tonnes?
Multiply the number of milligrams by 1e-09. To reverse it, divide by 1e-09 instead.
How do I convert tonnes back to milligrams?
Divide by 1e-09, which is the same as multiplying by 1e+09.
How many tonnes are in 10 milligrams?
10 mg works out to 1e-08 t.
Is there anything to watch out for with tonnes?
Distinct from the US short ton (2,000 lb ≈ 907 kg) and the UK long ton (2,240 lb ≈ 1,016 kg).
How is the milligram defined?
Exactly 1×10⁻⁶ kilogram by SI prefix definition.