Distance divided by time.
Foot per Days to Millimeter per Days Converter — ft/d to mm/d
Convert Foot per Days (ft/d) to Millimeter per Days (mm/d) using the exact conversion factor (1 foot per days = 304.8 millimeter per days). See the formula, worked examples, and conversion table.
Foot per Days to Millimeter per Days 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.
Distance divided by time.
Result = input x 3.52777778e-6 / 1.15740741e-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 Millimeter per Days
Foot per Days and Millimeter per Days both describe speed, and the conversion matters whenever a maritime or aviation speed (knots) needs to be compared against a road speed (mph). Both are distance divided by time units.
Formula
millimeter per days = foot per days × 304.8
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 millimeter per days equals 1.157407e-8 base units, so dividing one by the other gives the direct foot per days-to-millimeter per days factor of 304.8.
Simple example
1 ft/d × 304.8 = 304.8 mm/d
1 foot per days = 304.8 millimeter per days.
Real-world example
10 ft/d × 304.8 = 3,048 mm/d
10 foot per days = 3,048 millimeter per days.
Conversion table
| Foot per Days (ft/d) | Millimeter per Days (mm/d) |
|---|---|
| 1 ft/d | 304.8 mm/d |
| 5 ft/d | 1,524 mm/d |
| 10 ft/d | 3,048 mm/d |
| 25 ft/d | 7,620 mm/d |
| 50 ft/d | 15,240 mm/d |
| 100 ft/d | 30,480 mm/d |
Reverse conversion: Millimeter per Days to Foot per Days
304.8 mm/d × 0.003280839895 = 1 ft/d
304.8 millimeter per days = 1 foot per days.
foot per days = millimeter per days × 0.00328083989501
For a page dedicated to this direction, see Millimeter per Days to Foot per Days.
Understanding the Foot per Days (ft/d)
Distance divided by time.
Understanding the Millimeter per Days (mm/d)
Distance divided by time.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many millimeter per days are in 1 foot per days?
1 foot per days equals 304.8 millimeter per days, using the exact defined conversion factor rather than an estimate.
How do I convert foot per days to millimeter per days?
Multiply the foot per days value by 304.8. The converter above does this instantly to whatever precision you set.
How do I convert millimeter per days back to foot per days?
Use the reverse factor: 1 millimeter per days equals 0.0032808399 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 millimeter per days?
Millimeter per Days (mm/d) is a unit of speed.
Is the foot per days to millimeter per days conversion exact?
Yes. Both foot per days and millimeter per days are defined by fixed standards rather than physical artifacts, so the factor of 304.8 used above is exact to as many digits as you choose to display.