Convert Foot to Terameter
Convert feet to terameters instantly. 1 foot = 3.048e-13 terameter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Terameter 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.
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.
Foot to Terameter conversion formula
The relationship between feet and terameters:
To convert feet to terameters, multiply the value in feet by 3.048e-13. To reverse, multiply terameters by 3.28084e+12.
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 Foot converter for the reverse direction.
Step-by-step: convert feet to terameters
- Write down the value in feet (ft).
- Multiply that value by the factor 3.048e-13.
- The product is the equivalent value in terameters (Tm).
- To reverse, multiply the terameter value by 3.28084e+12.
Worked examples
Example 1 — Convert 1 ft to Tm:
1 × 3.048e-13 = 3.048e-13 Tm
Example 2 — Convert 100 ft to Tm:
100 × 3.048e-13 = 3.048e-11 Tm
Real-world example — Fabric purchase length
Two feet of fabric equals a value in terameters essential for tailors and textile buyers sourcing material from international suppliers that quote in different units.
2 ft × 3.048e-13 = 6.096e-13 Tm
Real-world example — Maritime depth conversion
A 10-foot sounding depth converts cleanly into terameters. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 ft × 3.048e-13 = 3.048e-12 Tm
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-13 = 3.048e-13 Tm
Foot to Terameter conversion table
Standard reference values for converting feet to terameters:
| Foot [ft] | Terameter [Tm] |
|---|---|
| 0.01 | 3.048e-15 |
| 0.1 | 3.048e-14 |
| 1 | 3.048e-13 |
| 2 | 6.096e-13 |
| 3 | 9.144e-13 |
| 4 | 1.2192e-12 |
| 5 | 1.524e-12 |
| 10 | 3.048e-12 |
| 20 | 6.096e-12 |
| 30 | 9.144e-12 |
| 40 | 1.2192e-11 |
| 50 | 1.524e-11 |
| 100 | 3.048e-11 |
| 500 | 1.524e-10 |
| 1000 | 3.048e-10 |
Frequently asked questions
How many terameters is 1 foot?
How do I convert feet to terameters?
How do I convert terameters back to feet?
How many terameters 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-13 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 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.