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

Multiply by 22/15, which is exactly 1.4666... repeating (written as 1.46667 rounded to 5 decimal places). The factor is derived from 1 mile = 5280 feet and 1 hour = 3600 seconds: 5280 ÷ 3600 = 22/15.

How fast is 60 mph in ft/s?

60 mph × 22/15 = 88 ft/s exactly. This is a useful benchmark: 60 mph is precisely 88 ft/s, a fact widely used in traffic engineering and driver education.

How do I convert ft/s back to mph?

Divide the ft/s value by 22/15, or equivalently multiply by 15/22 ≈ 0.68182. For example, 100 ft/s × 15/22 ≈ 68.18 mph. The reverse field in this tool gives instant results.

Why do engineers use ft/s instead of mph?

Feet per second is the standard velocity unit in the US customary system for engineering equations (e.g., kinetic energy KE = 0.5 × m × v², Bernoulli's equation, impact force). Using ft/s avoids extra conversion steps when plugging values into these formulas.

Is ft/s the same as fps?

Yes. "ft/s", "ft/sec", and "fps" all denote feet per second. The abbreviation "fps" is especially common in ballistics and fluid dynamics.

Miles per Hour to Feet per Second Converter

Name: Miles per Hour to Feet per Second Converter
Availability: InStock
Author: Nham Vu

Enter a speed in miles per hour and instantly get the equivalent in feet per second.

Speed Converter

Miles per Hour (mph)

Feet per Second (ft/s)

Reverse: ft/s → mph

Feet per Second (ft/s)

Miles per Hour (mph)

Common Reference Speeds

Description	mph	ft/s

Conversion formula: ft/s = mph × 22/15 (≈ 1.46667)
Reverse: mph = ft/s × 15/22 (≈ 0.68182)

Copied!

Summary

Enter a speed in miles per hour and instantly get the equivalent in feet per second.

How it works

Enter a speed value in the mph field.
The tool multiplies the input by 22/15 (the exact conversion factor, ≈ 1.46667).
The ft/s result appears instantly below the input.
Use the reverse field to convert ft/s back to mph.
Check the reference table for common speed benchmarks in both units.

Use cases

Convert highway speeds from mph speedometers to ft/s for physics and engineering problems.
Translate athlete sprint speeds from mph tracking apps to ft/s for biomechanics calculations.
Convert wind speeds from mph weather reports to ft/s for structural load calculations.
Verify drag-racing elapsed-time calculations that require velocity in ft/s.
Cross-check ballistic or projectile formulas that use ft/s as the velocity unit.
Convert vehicle crash-test speeds from mph to ft/s for impact-force analysis.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu