How do you convert feet per second to mph?

Divide the speed in feet per second by 1.46667, or multiply by 0.681818. Both give miles per hour.

What is the exact factor from ft/s to mph?

Since 1 mph = 1.466666... ft/s, the inverse is 1 ft/s = 0.681818 mph (recurring 18).

Can I convert mph back to feet per second?

Yes. Multiply mph by 1.46667 to get ft/s. This page includes a reverse converter box.

Feet per Second to MPH Converter

Convert ft/s (often used by sensors, ballistics, or physics labs) into mph (used on roads and in everyday life). Shows exact factor, reverse converter, and a quick reference table.

Convert speed

Speed in ft/s feet per second

Decimal places

Common ft/s presets:

Result

Miles per hour: –

Factors: 1 mph = 1.46667 ft/s

1 ft/s = 0.681818 mph

Reverse (mph → ft/s)

ft/s to mph formula

The two unit definitions we need:

1 mile = 5280 feet
1 hour = 3600 seconds

1 mph = 5280 / 3600 ft/s = 1.466666... ft/s

So the inverse:

mph = ft/s ÷ 1.46667
or
mph = ft/s × 0.681818

Example: 88 ft/s ÷ 1.46667 ≈ 60 mph (classic highway comparison).

Quick reference

ft/s	mph
10	6.82 mph
20	13.64 mph
30	20.45 mph
44	30.0 mph
88	60.0 mph
120	81.8 mph

FAQ

Why does my sensor output ft/s?

Many US-based measurement systems, especially older or industrial ones, work in imperial units by default. Converting to mph makes it easy to explain to drivers or non-technical staff.

How precise is 0.681818?

It’s the reciprocal of 1.466666..., so the 18 repeats. Rounding to 0.6818 or 0.682 is fine for most purposes.