Convert Terameter to Gigameter
Convert terameters to gigameters instantly. 1 terameter = 1000 gigameter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Gigameter to Terameter converter for the reverse conversion.
Units explained
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
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 to Gigameter conversion formula
The relationship between terameters and gigameters:
To convert terameters to gigameters, multiply the value in terameters by 1000. To reverse, multiply gigameters by 0.001.
How to use this converter
Type a value into the calculator. The result in gigameters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Gigameter to Terameter converter for the reverse direction.
Step-by-step: convert terameters to gigameters
- Write down the value in terameters (Tm).
- Multiply that value by the factor 1000.
- The product is the equivalent value in gigameters (Gm).
- To reverse, multiply the gigameter value by 0.001.
Worked examples
Example 1 — Convert 1 Tm to Gm:
1 × 1000 = 1000 Gm
Example 2 — Convert 100 Tm to Gm:
100 × 1000 = 100000 Gm
Terameter to Gigameter conversion table
Standard reference values for converting terameters to gigameters:
| Terameter [Tm] | Gigameter [Gm] |
|---|---|
| 0.01 | 10 |
| 0.1 | 100 |
| 1 | 1000 |
| 2 | 2000 |
| 3 | 3000 |
| 4 | 4000 |
| 5 | 5000 |
| 10 | 10000 |
| 20 | 20000 |
| 30 | 30000 |
| 40 | 40000 |
| 50 | 50000 |
| 100 | 100000 |
| 500 | 500000 |
| 1000 | 1000000 |
Frequently asked questions
How many gigameters is 1 terameter?
How do I convert terameters to gigameters?
How do I convert gigameters back to terameters?
How many gigameters is 100 terameters?
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Sources & references
Conversion factor (1 Tm = 1000 Gm) 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.