Convert Grams to Tonnes
1 gram is 0.000001 t. One gram is exactly 0.000001 tonnes.
One gram is 1.0000 × 10^-6 tonnes. To convert grams to tonnes, multiply by 1.0000 × 10^-6; to go the other way, divide by 1.0000 × 10^-6 or multiply by 1000000. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 44. One thousandth of a kilogram, and the unit nutrition labels use worldwide.
Factor checked against the defining standard · How we check
- Grams × 1.0000 × 10^-6
1 * 0.0000010 t
1 gram in every weight unit
| Unit | Value | Exact factor |
|---|---|---|
| ounces | 0.03527396195 oz | × 0.0352739619496 |
| pounds | 0.002204622622 lb | × 0.00220462262185 |
| stone | 0.0001574730444 st | × 0.000157473044418 |
| US tons | 0.000001102311311 ton | × 0.00000110231131092 |
| micrograms | 1,000,000 mcg | × 1,000,000 |
| milligrams | 1,000 mg | × 1,000 |
| centigrams | 100 cg | × 100 |
| grams (as entered) | 1 g | — |
| kilograms | 0.001 kg | × 0.001 |
| slugs | 0.00006852176586 slug | × 0.0000685217658568 |
| tonnes | 0.000001 t | × 0.000001 |
| carats | 5 ct | × 5 |
| troy ounces | 0.03215074657 ozt | × 0.0321507465686 |
| grains | 15.43235835 gr | × 15.4323583529 |
| long tons | 0.0000009842065276 LT | × 0.000000984206527611 |
Factors are entered by hand from NIST Handbook 44 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert grams to tonnes? The converter and the working
- 1.Take the measurement in grams.
- 2.Multiply by 1.0000 × 10^-6 — that is how many tonnes fit in one gram.
- 3.To go back the other way, divide by 1.0000 × 10^-6, or multiply by 1000000.
Worked example: 25 grams to tonnes
- Formula
- g × 1.0000 × 10^-6 = t
- Arithmetic
- 25 × 1.0000 × 10^-6 = 0.000025 t
- Answer
- 25 g = 0.000025 t
The factor is rounded for display; the figure above is computed from the full value.
Grams to tonnes conversion table
| Grams | Tonnes |
|---|---|
| 1 g | 0.000001 t |
| 2 g | 0.000002 t |
| 3 g | 0.000003 t |
| 4 g | 0.000004 t |
| 5 g | 0.000005 t |
| 6 g | 0.000006 t |
| 7 g | 0.000007 t |
| 8 g | 0.000008 t |
| 9 g | 0.000009 t |
| 10 g | 0.00001 t |
| 12 g | 0.000012 t |
| 15 g | 0.000015 t |
| 20 g | 0.00002 t |
| 25 g | 0.000025 t |
| 50 g | 0.00005 t |
| 100 g | 0.0001 t |
| 200 g | 0.0002 t |
| 300 g | 0.0003 t |
| 500 g | 0.0005 t |
| 1000 g | 0.001 t |
| 2000 g | 0.002 t |
| 5000 g | 0.01 t |
| 10000 g | 0.01 t |
What is a gram?
One thousandth of a kilogram, and the unit nutrition labels use worldwide.
What is a tonne?
One thousand kilograms, also called the metric ton — 2,204.6 pounds.
How many tonnes are in a gram?
One gram is 1.0000 × 10^-6 tonnes. Going the other way, one tonne is 1000000 grams. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every weight unit here
The whole group — 15 units with their symbols and the size of each one in kilograms — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a gram.
Cite this page
- APA
- Rule Calculator. (2026). Convert Grams to tonnes. Rule Calculator. https://rulecalculators.com/convert/gram-to-tonne
- MLA
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- Chicago
- Rule Calculator. "Convert Grams to tonnes." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/gram-to-tonne.
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Questions people actually ask
- How many tonnes are in a gram?
- 1.0000 × 10^-6. One thousand kilograms, also called the metric ton — 2,204.6 pounds.
- How do I convert tonnes back to grams?
- Divide by 1.0000 × 10^-6, or multiply by 1000000 — they are the same operation.
Other weight conversions
Tonnes to grams — the same conversion the other way.