Convert Foot to Gigameter
Convert feet to gigameters instantly. 1 foot = 3.048e-10 gigameter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Gigameter to Foot converter for the reverse conversion.
Units explained
Foot
A foot is an Imperial and US customary unit of length equal to 12 inches or exactly 0.3048 meters. It is the most commonly used unit of length in everyday measurement in the United States.
The foot's origin is literally the length of a human foot, used as a measurement standard since antiquity. The English foot was standardized at various points in history; the modern international foot (0.3048 m exactly) was fixed by the 1959 International Yard and Pound Agreement.
Feet are used in the US for body height, building dimensions, room sizes, road sign clearances, aviation altitude (feet above sea level), and most everyday distance estimation. The UK uses feet informally for height despite officially being metric.
Used since antiquity; standardized to 0.3048 m exactly by the International Yard and Pound Agreement of 1959. Aviation worldwide uses feet for altitude despite metric adoption elsewhere.
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.
Foot to Gigameter conversion formula
The relationship between feet and gigameters:
To convert feet to gigameters, multiply the value in feet by 3.048e-10. To reverse, multiply gigameters by 3.28084e+9.
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 Foot converter for the reverse direction.
Step-by-step: convert feet to gigameters
- Write down the value in feet (ft).
- Multiply that value by the factor 3.048e-10.
- The product is the equivalent value in gigameters (Gm).
- To reverse, multiply the gigameter value by 3.28084e+9.
Worked examples
Example 1 — Convert 1 ft to Gm:
1 × 3.048e-10 = 3.048e-10 Gm
Example 2 — Convert 100 ft to Gm:
100 × 3.048e-10 = 3.048e-8 Gm
Real-world example — Maritime depth conversion
A 10-foot sounding depth converts cleanly into gigameters. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 ft × 3.048e-10 = 3.048e-9 Gm
Real-world example — Reference scenario in case of fallback
Conversion between human-scale length units is the everyday workflow of architecture, athletics, and apparel design — three of the most common contexts that span metric and imperial systems.
1 ft × 3.048e-10 = 3.048e-10 Gm
Real-world example — Adult height conversion
A 1.8-foot-tall person measures a value in gigameters that converts the height to the unit favoured by American forms, schools, or driver's licences. This is daily routine for anyone living between metric and imperial systems.
1.8 ft × 3.048e-10 = 5.4864e-10 Gm
Foot to Gigameter conversion table
Standard reference values for converting feet to gigameters:
| Foot [ft] | Gigameter [Gm] |
|---|---|
| 0.01 | 3.048e-12 |
| 0.1 | 3.048e-11 |
| 1 | 3.048e-10 |
| 2 | 6.096e-10 |
| 3 | 9.144e-10 |
| 4 | 1.2192e-9 |
| 5 | 1.524e-9 |
| 10 | 3.048e-9 |
| 20 | 6.096e-9 |
| 30 | 9.144e-9 |
| 40 | 1.2192e-8 |
| 50 | 1.524e-8 |
| 100 | 3.048e-8 |
| 500 | 1.524e-7 |
| 1000 | 3.048e-7 |
Frequently asked questions
How many gigameters is 1 foot?
How do I convert feet to gigameters?
How do I convert gigameters back to feet?
How many gigameters is 100 feet?
Popular length unit conversions
Convert Foot to other length units
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Metric / SI (18 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 ft = 3.048e-10 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.