How to Convert Grams to Tonnes (g to t)
Weight units matter at the wet market, where older stalls and Chinese medical halls still quote prices per kati or tael, and when following American recipes in ounces and pounds. This guide shows how to convert grams into tonnes by hand, with examples and a quick-reference table.
The conversion
To convert grams to tonnes, multiply the value by 1.000000e-06. To go the other way, divide by the same number (or multiply by 1,000,000). Because the factor is tiny, scientific notation keeps the numbers manageable.
Tonnes = grams × 1.000000e-06
Worked examples
- 3 g = 3.000000e-6 t
- 12.5 g = 1.250000e-5 t
- 75 g = 7.500000e-5 t
Grams to Tonnes table
| Grams | Tonnes |
|---|---|
| 1 g | 1.000000e-6 t |
| 2 g | 2.000000e-6 t |
| 5 g | 5.000000e-6 t |
| 10 g | 1.000000e-5 t |
| 20 g | 2.000000e-5 t |
| 25 g | 2.500000e-5 t |
| 50 g | 5.000000e-5 t |
| 100 g | 1.000000e-4 t |
| 250 g | 0.00025 t |
| 500 g | 0.0005 t |
| 1,000 g | 0.001 t |
Common questions
Is g to t exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Tonnes to Grams converter.
Mistakes to avoid
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Background
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
For any value, use the Grams to Tonnes Converter or browse all weight converters.
Run your own numbers: Grams to Tonnes Converter