Convert Foot to Petameter
Convert feet to petameters instantly. 1 foot = 3.048e-16 petameter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Petameter 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.
Petameter
A petameter is a metric unit of length equal to one quadrillion meters (1×10¹⁵ m). It is rarely used in everyday or scientific contexts; astronomers prefer the light-year or parsec for these scales.
The petameter uses the SI prefix peta- (from Greek penta, five, by analogy with the exponent's relation to thousand-cubed-cubed), adopted by the CGPM in 1975 to denote 10¹⁵.
Petameters could express interstellar-scale distances but are almost never used in practice. A light-year is approximately 9.46 Pm; astronomy uses light-years and parsecs as standard.
SI prefix peta- adopted in 1975; the petameter is rarely used because astronomy has well-established non-SI units (light-year, parsec) for this scale.
Foot to Petameter conversion formula
The relationship between feet and petameters:
To convert feet to petameters, multiply the value in feet by 3.048e-16. To reverse, multiply petameters by 3.28084e+15.
How to use this converter
Type a value into the calculator. The result in petameters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Petameter to Foot converter for the reverse direction.
Step-by-step: convert feet to petameters
- Write down the value in feet (ft).
- Multiply that value by the factor 3.048e-16.
- The product is the equivalent value in petameters (Pm).
- To reverse, multiply the petameter value by 3.28084e+15.
Worked examples
Example 1 — Convert 1 ft to Pm:
1 × 3.048e-16 = 3.048e-16 Pm
Example 2 — Convert 100 ft to Pm:
100 × 3.048e-16 = 3.048e-14 Pm
Real-world example — Adult height conversion
A 1.8-foot-tall person measures a value in petameters 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-16 = 5.4864e-16 Pm
Real-world example — Fabric purchase length
Two feet of fabric equals a value in petameters essential for tailors and textile buyers sourcing material from international suppliers that quote in different units.
2 ft × 3.048e-16 = 6.096e-16 Pm
Real-world example — Maritime depth conversion
A 10-foot sounding depth converts cleanly into petameters. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 ft × 3.048e-16 = 3.048e-15 Pm
Foot to Petameter conversion table
Standard reference values for converting feet to petameters:
| Foot [ft] | Petameter [Pm] |
|---|---|
| 0.01 | 3.048e-18 |
| 0.1 | 3.048e-17 |
| 1 | 3.048e-16 |
| 2 | 6.096e-16 |
| 3 | 9.144e-16 |
| 4 | 1.2192e-15 |
| 5 | 1.524e-15 |
| 10 | 3.048e-15 |
| 20 | 6.096e-15 |
| 30 | 9.144e-15 |
| 40 | 1.2192e-14 |
| 50 | 1.524e-14 |
| 100 | 3.048e-14 |
| 500 | 1.524e-13 |
| 1000 | 3.048e-13 |
Frequently asked questions
How many petameters is 1 foot?
How do I convert feet to petameters?
How do I convert petameters back to feet?
How many petameters is 100 feet?
Popular length unit conversions
Convert Foot to other length units
Show all Foot conversions
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-16 Pm) 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.