Speed / ft/s → mph
Convert Feet per second to Miles per hour
Convert linear speeds in metric, customary, and nautical units. Convert Feet per second (ft/s) to Miles per hour (mph). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Miles per hour to Feet per second →
How to convert feet per second to miles per hour
A knot is one international nautical mile (1852 meters) per hour. Mach is excluded because the speed of sound depends on the medium and conditions.
Use x for the value in ft/s, b for the intermediate value in m/s, and y for the result in mph.
mph = ft/s × 0.3048 ÷ 0.44704
Worked examples
10 ft/s ≈ 6.81818181818 mph
Step 1: (10 × 0.3048) ≈ 3.048 m/s.
Step 2: 3.048 ÷ 0.44704 ≈ 6.81818181818 mph.20 ft/s ≈ 13.6363636364 mph
Step 1: (20 × 0.3048) ≈ 6.096 m/s.
Step 2: 6.096 ÷ 0.44704 ≈ 13.6363636364 mph.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Feet per second
Feet per second (ft/s) measures speed under the conventions above. The base value in m/s is (x × 0.3048), where x is the numerical value in ft/s. Factors shown here are rounded for display; calculations use the stored factor.
About Miles per hour
Miles per hour (mph) measures speed under the conventions above. The base value in m/s is (x × 0.44704), where x is the numerical value in mph. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Feet per second to miles per hour reference table
| Feet per second (ft/s) | Miles per hour (mph) |
|---|---|
| 1 | 0.681818181818 |
| 5 | 3.40909090909 |
| 10 | 6.81818181818 |
| 25 | 17.0454545455 |
| 50 | 34.0909090909 |
| 100 | 68.1818181818 |
| 1000 | 681.818181818 |
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