Convert Gigameter to Terameter
Convert gigameters to terameters instantly. 1 gigameter = 0.001 terameter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Terameter to Gigameter converter for the reverse conversion.
Units explained
Gigameter
A gigameter is a metric unit of length equal to one billion meters (1×10⁹ m). It is most often used in astronomy and astrophysics when expressing distances within the inner solar system.
The gigameter uses the SI prefix giga- (from Greek gigas, giant), adopted by the CGPM in 1960 to denote multiplication by one billion (10⁹).
Gigameters are used to express distances such as the Sun's diameter (~1.39 Gm), the Earth–Moon distance (~0.384 Gm), and similar inner-solar-system scales. Astronomical units and light-seconds are also common for these distances.
SI prefix giga- adopted in 1960; the gigameter became standard in astronomy for sub-AU distances by the late 20th century.
Terameter
A terameter is a metric unit of length equal to one trillion meters (1×10¹² m). It is rare in everyday use but appears in astronomy when expressing solar-system-scale distances in SI units.
The terameter uses the SI prefix tera- (from Greek teras, monster), adopted by the CGPM in 1960 to denote multiplication by one trillion (10¹²).
Terameters are occasionally used in astronomy to express distances on the order of Earth–Sun (~0.15 Tm or 1 AU) and outer-planet distances. The astronomical unit (AU) and light-hour are more common in practice.
SI prefix tera- adopted in 1960; the terameter is the standard SI prefix unit for distances comparable to inter-planetary scales but is less common than the AU in working astronomy.
Gigameter to Terameter conversion formula
The relationship between gigameters and terameters:
To convert gigameters to terameters, multiply the value in gigameters by 0.001. To reverse, multiply terameters by 1000.
How to use this converter
Type a value into the calculator. The result in terameters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Terameter to Gigameter converter for the reverse direction.
Step-by-step: convert gigameters to terameters
- Write down the value in gigameters (Gm).
- Multiply that value by the factor 0.001.
- The product is the equivalent value in terameters (Tm).
- To reverse, multiply the terameter value by 1000.
Worked examples
Example 1 — Convert 1 Gm to Tm:
1 × 0.001 = 0.001 Tm
Example 2 — Convert 100 Gm to Tm:
100 × 0.001 = 0.1 Tm
Gigameter to Terameter conversion table
Standard reference values for converting gigameters to terameters:
| Gigameter [Gm] | Terameter [Tm] |
|---|---|
| 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 terameters is 1 gigameter?
How do I convert gigameters to terameters?
How do I convert terameters back to gigameters?
How many terameters is 100 gigameters?
Popular length unit conversions
Convert Gigameter to other length units
Show all Gigameter conversions
Metric / SI (17 units)
Imperial / US Customary (4 units)
Sources & references
Conversion factor (1 Gm = 0.001 Tm) 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.