Distance divided by time.
Millimeter per Days to ft/s Converter — mm/d to ft/s
Convert Millimeter per Days (mm/d) to ft/s (ft/s) using the exact conversion factor (1 millimeter per days = 3.797268e-8 ft/s). See the formula, worked examples, and conversion table.
Millimeter per Days to ft/s 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.
Feet per second.
Result = input x 1.15740741e-8 / 0.3048.
Speed uses meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Millimeter per Days to ft/s
Millimeter per Days and ft/s 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 feet per second.
Formula
ft/s = millimeter per days × 3.797268e-8
This factor comes from each unit's defined relationship to the category's base unit: 1 millimeter per days equals 1.157407e-8 base units, and 1 ft/s equals 0.3048 base units, so dividing one by the other gives the direct millimeter per days-to-ft/s factor of 3.797268e-8.
Simple example
1 mm/d × 3.797268e-8 = 3.797268e-8 ft/s
1 millimeter per days = 3.797268e-8 ft/s.
Real-world example
10 mm/d × 3.797268e-8 = 3.797268e-7 ft/s
10 millimeter per days = 3.797268e-7 ft/s.
Conversion table
| Millimeter per Days (mm/d) | ft/s (ft/s) |
|---|---|
| 1 mm/d | 3.797268e-8 ft/s |
| 5 mm/d | 1.898634e-7 ft/s |
| 10 mm/d | 3.797268e-7 ft/s |
| 25 mm/d | 9.493171e-7 ft/s |
| 50 mm/d | 0.0000018986 ft/s |
| 100 mm/d | 0.0000037973 ft/s |
Reverse conversion: ft/s to Millimeter per Days
3.797268e-8 ft/s × 26334720 = 0.9999998954 mm/d
3.797268e-8 ft/s = 0.9999998954 millimeter per days.
millimeter per days = ft/s × 26334720
For a page dedicated to this direction, see ft/s to Millimeter per Days.
Understanding the Millimeter per Days (mm/d)
Distance divided by time.
Understanding the ft/s (ft/s)
Feet per second.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ft/s are in 1 millimeter per days?
1 millimeter per days equals 3.797268e-8 ft/s, using the exact defined conversion factor rather than an estimate.
How do I convert millimeter per days to ft/s?
Multiply the millimeter per days value by 3.797268e-8. The converter above does this instantly to whatever precision you set.
How do I convert ft/s back to millimeter per days?
Use the reverse factor: 1 ft/s equals 26,334,720 millimeter per days. You can also use the swap control in the converter above to flip the direction instantly.
What is a millimeter per days?
Millimeter per Days (mm/d) is a unit of speed.
What is a ft/s?
ft/s (ft/s) is a unit of speed.
Is the millimeter per days to ft/s conversion exact?
Yes. Both millimeter per days and ft/s are defined by fixed standards rather than physical artifacts, so the factor of 3.797268e-8 used above is exact to as many digits as you choose to display.