Convert Tonnes to Grams
1 tonne is 1,000,000 g. One tonne is exactly 1000000 grams.
One tonne is 1000000 grams. To convert tonnes to grams, multiply by 1000000; to go the other way, divide by 1000000 or multiply by 1.0000 × 10^-6. The factor is exact rather than rounded: it follows from NIST Handbook 44. One thousand kilograms, also called the metric ton — 2,204.6 pounds.
Factor checked against the defining standard · How we check
- Tonnes × 1000000
1 * 10000001,000,000 g
1 tonne in every weight unit
| Unit | Value | Exact factor |
|---|---|---|
| ounces | 35,273.96195 oz | × 35,273.9619496 |
| pounds | 2,204.622622 lb | × 2,204.62262185 |
| stone | 157.4730444 st | × 157.473044418 |
| US tons | 1.102311311 ton | × 1.10231131092 |
| micrograms | 1,000,000,000,000 mcg | × 1,000,000,000,000 |
| milligrams | 1,000,000,000 mg | × 1,000,000,000 |
| centigrams | 100,000,000 cg | × 100,000,000 |
| grams | 1,000,000 g | × 1,000,000 |
| kilograms | 1,000 kg | × 1,000 |
| slugs | 68.52176586 slug | × 68.5217658568 |
| tonnes (as entered) | 1 t | — |
| carats | 5,000,000 ct | × 5,000,000 |
| troy ounces | 32,150.74657 ozt | × 32,150.7465686 |
| grains | 15,432,358.35 gr | × 15,432,358.3529 |
| long tons | 0.9842065276 LT | × 0.984206527611 |
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 tonnes to grams? The converter and the working
- 1.Take the measurement in tonnes.
- 2.Multiply by 1000000 — that is how many grams fit in one tonne.
- 3.To go back the other way, divide by 1000000, or multiply by 1.0000 × 10^-6.
Worked example: 25 tonnes to grams
- Formula
- t × 1000000 = g
- Arithmetic
- 25 × 1000000 = 25,000,000 g
- Answer
- 25 t = 25,000,000 g
The factor is exact, so this figure is exact too — only the display is rounded.
Tonnes to grams conversion table
| Tonnes | Grams |
|---|---|
| 1 t | 1,000,000 g |
| 2 t | 2,000,000 g |
| 3 t | 3,000,000 g |
| 4 t | 4,000,000 g |
| 5 t | 5,000,000 g |
| 6 t | 6,000,000 g |
| 7 t | 7,000,000 g |
| 8 t | 8,000,000 g |
| 9 t | 9,000,000 g |
| 10 t | 10,000,000 g |
| 12 t | 12,000,000 g |
| 15 t | 15,000,000 g |
| 20 t | 20,000,000 g |
| 25 t | 25,000,000 g |
| 50 t | 50,000,000 g |
| 100 t | 100,000,000 g |
| 200 t | 200,000,000 g |
| 300 t | 300,000,000 g |
| 500 t | 500,000,000 g |
| 1000 t | 1,000,000,000 g |
| 2000 t | 2,000,000,000 g |
| 5000 t | 5,000,000,000 g |
| 10000 t | 10,000,000,000 g |
What is a tonne?
One thousand kilograms, also called the metric ton — 2,204.6 pounds.
What is a gram?
One thousandth of a kilogram, and the unit nutrition labels use worldwide.
How many grams are in a tonne?
One tonne is 1000000 grams, exactly. Going the other way, one gram is 1.0000 × 10^-6 tonnes. 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 tonne.
Cite this page
- APA
- Rule Calculator. (2026). Convert Tonnes to grams. Rule Calculator. https://rulecalculators.com/convert/tonne-to-gram
- MLA
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- Chicago
- Rule Calculator. "Convert Tonnes to grams." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/tonne-to-gram.
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Questions people actually ask
- How many grams are in a tonne?
- 1000000. One thousandth of a kilogram, and the unit nutrition labels use worldwide.
- How do I convert grams back to tonnes?
- Divide by 1000000, or multiply by 1.0000 × 10^-6 — they are the same operation.
Other weight conversions
Grams to tonnes — the same conversion the other way.