Distance divided by time.
Foot per Days to Speed of lights Converter — ft/d to c
Convert Foot per Days (ft/d) to Speed of light (c) using the exact conversion factor (1 foot per days = 1.17674e-14 speed of light). See the formula, worked examples, and conversion table.
Foot per Days to Speed of lights converter
Converter
Speed Converter
Convert road, aviation, marine, lab, and scientific speed units.
Context values
Some unit families need one extra value for a physically accurate result.
Speed of light in vacuum.
Result = input x 3.52777778e-6 / 2.99792458e+8.
Speed uses meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Foot per Days to Speed of lights
Foot per Days and Speed of light both describe speed, and the conversion matters whenever a maritime or aviation speed (knots) needs to be compared against a road speed (mph). Specifically: Distance divided by time, and speed of light in vacuum.
Formula
speed of lights = foot per days × 1.17674e-14
This factor comes from each unit's defined relationship to the category's base unit: 1 foot per days equals 0.00000352777777778 base units, and 1 speed of light equals 299792458 base units, so dividing one by the other gives the direct foot per days-to-speed of light factor of 1.17674e-14.
Simple example
1 ft/d × 1.17674e-14 = 1.17674e-14 c
1 foot per days = 1.17674e-14 speed of lights.
Real-world example
10 ft/d × 1.17674e-14 = 1.17674e-13 c
10 foot per days = 1.17674e-13 speed of lights.
Conversion table
| Foot per Days (ft/d) | Speed of light (c) |
|---|---|
| 1 ft/d | 1.17674e-14 c |
| 5 ft/d | 5.8837e-14 c |
| 10 ft/d | 1.17674e-13 c |
| 25 ft/d | 2.94185e-13 c |
| 50 ft/d | 5.8837e-13 c |
| 100 ft/d | 1.17674e-12 c |
Reverse conversion: Speed of light to Foot per Days
1.17674e-14 c × 8.498054e+13 = 0.9999999979 ft/d
1.17674e-14 speed of lights = 0.9999999979 foot per days.
foot per days = speed of lights × 8.498054e+13
For a page dedicated to this direction, see Speed of light to Foot per Days.
Understanding the Foot per Days (ft/d)
Distance divided by time.
Understanding the Speed of light (c)
Speed of light in vacuum.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many speed of lights are in 1 foot per days?
1 foot per days equals 1.17674e-14 speed of lights, using the exact defined conversion factor rather than an estimate.
How do I convert foot per days to speed of light?
Multiply the foot per days value by 1.17674e-14. The converter above does this instantly to whatever precision you set.
How do I convert speed of light back to foot per days?
Use the reverse factor: 1 speed of light equals 8.498054e+13 foot per days. You can also use the swap control in the converter above to flip the direction instantly.
What is a foot per days?
Foot per Days (ft/d) is a unit of speed.
What is a speed of light?
Speed of light (c) is a unit of speed.
Is the foot per days to speed of light conversion exact?
Yes. Both foot per days and speed of light are defined by fixed standards rather than physical artifacts, so the factor of 1.17674e-14 used above is exact to as many digits as you choose to display.