Convert Gigameter to Decimeter
Convert gigameters to decimeters instantly. 1 gigameter = 1e+10 decimeter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Decimeter 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.
Decimeter
A decimeter is a metric unit of length equal to one tenth of a meter (1/10 m). Though uncommon in English-speaking countries, it remains a standard SI unit and is used in some scientific and educational contexts.
Like the centimeter and millimeter, the decimeter was defined when France adopted the metric system in 1795, using the SI prefix deci- (from Latin decimus, "tenth").
Decimeters are rarely used in everyday measurement in English-speaking countries but appear in some European technical specifications and in volume conversions (1 cubic decimeter = 1 liter).
Defined in 1795 as part of the original French metric system; remains a recognized SI unit though uncommonly used in commerce.
Gigameter to Decimeter conversion formula
The relationship between gigameters and decimeters:
To convert gigameters to decimeters, multiply the value in gigameters by 1e+10. To reverse, multiply decimeters by 1e-10.
How to use this converter
Type a value into the calculator. The result in decimeters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Decimeter to Gigameter converter for the reverse direction.
Step-by-step: convert gigameters to decimeters
- Write down the value in gigameters (Gm).
- Multiply that value by the factor 1e+10.
- The product is the equivalent value in decimeters (dm).
- To reverse, multiply the decimeter value by 1e-10.
Worked examples
Example 1 — Convert 1 Gm to dm:
1 × 1e+10 = 1e+10 dm
Example 2 — Convert 100 Gm to dm:
100 × 1e+10 = 1e+12 dm
Gigameter to Decimeter conversion table
Standard reference values for converting gigameters to decimeters:
| Gigameter [Gm] | Decimeter [dm] |
|---|---|
| 0.01 | 1e+8 |
| 0.1 | 1e+9 |
| 1 | 1e+10 |
| 2 | 2e+10 |
| 3 | 3e+10 |
| 4 | 4e+10 |
| 5 | 5e+10 |
| 10 | 1e+11 |
| 20 | 2e+11 |
| 30 | 3e+11 |
| 40 | 4e+11 |
| 50 | 5e+11 |
| 100 | 1e+12 |
| 500 | 5e+12 |
| 1000 | 1e+13 |
Frequently asked questions
How many decimeters is 1 gigameter?
How do I convert gigameters to decimeters?
How do I convert decimeters back to gigameters?
How many decimeters is 100 gigameters?
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Sources & references
Conversion factor (1 Gm = 1e+10 dm) 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.