Grams to Tonnes
An instant grams-to-tonnes converter, with the formula and a reference table below.
| Grams | Tonnes |
|---|---|
| 1 g | 1e-06 t |
| 2 g | 2e-06 t |
| 3 g | 3e-06 t |
| 5 g | 5e-06 t |
| 10 g | 1e-05 t |
| 25 g | 2.5e-05 t |
| 50 g | 5e-05 t |
| 100 g | 0.0001 t |
How to use
- Enter a value in the Grams field.
- The Tonnes figure appears immediately — no button to press.
- Typing in the Tonnes field converts back to Grams the same way.
- Use the reference table for the values that come up most often.
Grams to Tonnes formula
The factor from grams to tonnes is 1e-06.
t = g × 1e-06
Why this factor: the gram and the tonne are both defined against the kilogram, so dividing one definition by the other gives 1e-06 directly. Both definitions are set out in full below.
To go the other way, divide by 1e-06 — or use the Tonnes to Grams converter, which is the same calculation reversed.
Worked example
Given 2 g, multiplying by 1e-06 yields 2e-06 t.
2 g × 1e-06 = 2e-06 t
The converter above does this for any value you type, in either direction.
What is a gram?
A gram is one thousandth of a kilogram, the everyday unit for food and small-object mass.
Definition: Exactly 0.001 kilogram by SI prefix definition.
Where it is used: Nutrition labels, recipes, postal rates, and laboratory weighing.
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).
Grams vs Tonnes
The gram 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 gram?
One gram equals 1e-06 tonnes.
What is the formula to convert grams to tonnes?
Multiply the number of grams by 1e-06. To reverse it, divide by 1e-06 instead.
How do I convert tonnes back to grams?
Divide by 1e-06, which is the same as multiplying by 1000000.
How many tonnes are in 10 grams?
10 g works out to 1e-05 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 gram defined?
Exactly 0.001 kilogram by SI prefix definition.