Convert Centimeter to Gigameter
Convert centimeters to gigameters instantly. 1 centimeter = 1e-11 gigameter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Gigameter to Centimeter converter for the reverse conversion.
Units explained
Centimeter
A centimeter is a metric unit of length equal to one hundredth of a meter (1/100 m). It is one of the most commonly used SI sub-units in daily life, especially for measuring small objects, body dimensions, paper sizes, and short distances.
The centimeter emerged from the French metric system established by the French Academy of Sciences in 1793. The metric system introduced decimal-based prefixes (milli-, centi-, deci-, deca-, hecto-, kilo-) to create proportional sub-units of the meter.
Centimeters are the standard unit for everyday measurement in nearly every country outside the United States. They are used for body height, clothing sizes, rainfall, paper formats (A4 is 21 × 29.7 cm), screen dimensions, and most consumer product specifications.
Developed in France during the late 18th century as part of the metric system designed by the French Academy of Sciences. Formally adopted in France in 1795 and ratified internationally through the Metre Convention signed in Paris in 1875.
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.
Centimeter to Gigameter conversion formula
The relationship between centimeters and gigameters:
To convert centimeters to gigameters, multiply the value in centimeters by 1e-11. To reverse, multiply gigameters by 1e+11.
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 Centimeter converter for the reverse direction.
Step-by-step: convert centimeters to gigameters
- Write down the value in centimeters (cm).
- Multiply that value by the factor 1e-11.
- The product is the equivalent value in gigameters (Gm).
- To reverse, multiply the gigameter value by 1e+11.
Worked examples
Example 1 — Convert 1 cm to Gm:
1 × 1e-11 = 1e-11 Gm
Example 2 — Convert 100 cm to Gm:
100 × 1e-11 = 1e-9 Gm
Real-world example — Hardware-scale dimensions
A 10-centimeter fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between centimeters and gigameters daily when mixing metric and imperial tools.
10 cm × 1e-11 = 1e-10 Gm
Real-world example — Postcard and small-object dimensions
A postcard is about 5 centimeters wide. Converting to gigameters is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 cm × 1e-11 = 5e-11 Gm
Real-world example — Ruler-scale measurements
A 30-centimeter school ruler converts cleanly to gigameters — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 cm × 1e-11 = 3e-10 Gm
Centimeter to Gigameter conversion table
Standard reference values for converting centimeters to gigameters:
| Centimeter [cm] | Gigameter [Gm] |
|---|---|
| 0.01 | 1e-13 |
| 0.1 | 1e-12 |
| 1 | 1e-11 |
| 2 | 2e-11 |
| 3 | 3e-11 |
| 4 | 4e-11 |
| 5 | 5e-11 |
| 10 | 1e-10 |
| 20 | 2e-10 |
| 30 | 3e-10 |
| 40 | 4e-10 |
| 50 | 5e-10 |
| 100 | 1e-9 |
| 500 | 5e-9 |
| 1000 | 1e-8 |
Frequently asked questions
How many gigameters is 1 centimeter?
How do I convert centimeters to gigameters?
How do I convert gigameters back to centimeters?
How many gigameters is 100 centimeters?
Popular length unit conversions
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Metric / SI (17 units)
Imperial / US Customary (27 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 cm = 1e-11 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 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.