Convert Gigagram to Teragram
Convert gigagrams to teragrams instantly. 1 gigagram = 0.001 teragram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Teragram to Gigagram converter for the reverse conversion.
Units explained
Gigagram
A gigagram (Gg) equals 10^6 kilograms, the same as 1,000 metric tons.
From the SI prefix 'giga-' (from Greek 'gigas', giant).
Bulk commodity, emissions, and freight accounting.
The giga- prefix entered the SI in 1960.
Teragram
A teragram (Tg) equals 10^9 kilograms, or one million metric tons.
From the SI prefix 'tera-' (from Greek 'teras', monster).
Used in large-scale environmental and industrial mass accounting.
The tera- prefix entered the SI in 1960.
Gigagram to Teragram conversion formula
The relationship between gigagrams and teragrams:
To convert gigagrams to teragrams, multiply the value in gigagrams by 0.001. To reverse, multiply teragrams by 1000.
How to use this converter
Type a value into the calculator. The result in teragrams updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Teragram to Gigagram converter for the reverse direction.
Step-by-step: convert gigagrams to teragrams
- Write down the value in gigagrams (Gg).
- Multiply that value by the factor 0.001.
- The product is the equivalent value in teragrams (Tg).
- To reverse, multiply the teragram value by 1000.
Worked examples
Example 1 — Convert 1 Gg to Tg:
1 × 0.001 = 0.001 Tg
Example 2 — Convert 100 Gg to Tg:
100 × 0.001 = 0.1 Tg
Gigagram to Teragram conversion table
Standard reference values for converting gigagrams to teragrams:
| Gigagram [Gg] | Teragram [Tg] |
|---|---|
| 0.01 | 1e-5 |
| 0.1 | 0.0001 |
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 30 | 0.03 |
| 40 | 0.04 |
| 50 | 0.05 |
| 100 | 0.1 |
| 500 | 0.5 |
| 1000 | 1 |
Frequently asked questions
How many teragrams is 1 gigagram?
How do I convert gigagrams to teragrams?
How do I convert teragrams back to gigagrams?
How many teragrams is 100 gigagrams?
Popular weight unit conversions
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Metric / SI (17 units)
Avoirdupois (15 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 Gg = 0.001 Tg) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.