Micrograms to Tonnes
An instant micrograms-to-tonnes converter, with the formula and a reference table below.
| Micrograms | Tonnes |
|---|---|
| 1 µg | 1e-12 t |
| 2 µg | 2e-12 t |
| 3 µg | 3e-12 t |
| 5 µg | 5e-12 t |
| 10 µg | 1e-11 t |
| 25 µg | 2.5e-11 t |
| 50 µg | 5e-11 t |
| 100 µg | 1e-10 t |
How to use
- Enter a value in the Micrograms field.
- The Tonnes figure appears immediately — no button to press.
- Typing in the Tonnes field converts back to Micrograms the same way.
- Use the reference table for the values that come up most often.
Micrograms to Tonnes formula
To convert micrograms to tonnes, multiply by 1e-12.
t = µg × 1e-12
Why this factor: the microgram and the tonne are both defined against the kilogram, so dividing one definition by the other gives 1e-12 directly. Both definitions are set out in full below.
To go the other way, divide by 1e-12 — or use the Tonnes to Micrograms converter, which is the same calculation reversed.
Worked example
Given 25 µg, multiplying by 1e-12 yields 2.5e-11 t.
25 µg × 1e-12 = 2.5e-11 t
The converter above does this for any value you type, in either direction.
What is a microgram?
A microgram is one millionth of a gram, used where quantities are vanishingly small but still matter.
Definition: Exactly 1×10⁻⁹ kilogram by SI prefix definition. Symbol µg.
Where it is used: Trace nutrients such as vitamin B12 and folate, hormone doses, and air-quality measurements.
Worth knowing: Sometimes abbreviated 'mcg' on labels specifically to avoid µg being misread as mg — a thousandfold dosing error.
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).
Micrograms vs Tonnes
The microgram 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 microgram?
One microgram equals 1e-12 tonnes.
What is the formula to convert micrograms to tonnes?
Multiply the number of micrograms by 1e-12. To reverse it, divide by 1e-12 instead.
How do I convert tonnes back to micrograms?
Divide by 1e-12, which is the same as multiplying by 1e+12.
How many tonnes are in 10 micrograms?
10 µg works out to 1e-11 t.
Is there anything to watch out for with micrograms?
Sometimes abbreviated 'mcg' on labels specifically to avoid µg being misread as mg — a thousandfold dosing error.
How is the microgram defined?
Exactly 1×10⁻⁹ kilogram by SI prefix definition. Symbol µg.