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Feet per Second to Miles per Hour (ft/s to mph) Converter

Convert ft/s to mph and mph to ft/s instantly.
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ft/s to mph – Instant Calculator

Feet per Second (ft/s)

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Miles per Hour (mph)

Common Conversion Examples

10 ft/s = 6.81818 mph

10 ft/s = 6.81818 mph

15 ft/s = 10.2273 mph

15 ft/s = 10.2273 mph

30 ft/s = 20.4545 mph

30 ft/s = 20.4545 mph

60 ft/s = 40.9091 mph

60 ft/s = 40.9091 mph

ft/s to mph: Definition, History, Uses, and Examples

Definition

Feet per second (ft/s) is an imperial unit for speed commonly used in engineering and construction, while miles per hour (mph) is the standard imperial unit for speed. The ft/s to mph formula is: mph = ft/s × 0.681818. This conversion is essential for engineering calculations, construction projects, and mechanical systems.

Origin or History

Feet per second has been used in engineering and construction for centuries, particularly in the United States and other countries using imperial units. The factor 0.681818 comes from the relationship: 1 mile = 5280 feet and 1 hour = 3600 seconds, so 1 ft/s = 5280/3600 = 1.46667 ft/s, and 1/1.46667 = 0.681818.

Current Use

  • Engineering & Construction: project planning, equipment specifications, and safety calculations.
  • Mechanical Systems: pump speeds, conveyor belt velocities, and machinery performance.
  • Fluid Dynamics: pipe flow rates, ventilation systems, and hydraulic calculations.

Examples

ft/smphExample Use
106.81818Walking speed
1510.2273Jogging speed
3020.4545Cycling speed
6040.9091Urban speed limit

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  • pump speed ft/s to mph

Frequently Asked Questions

How do I convert feet per second to miles per hour, step by step?
Multiply the value in ft/s by 0.681818. For example, 20 ft/s × 0.681818 = 13.63636 mph. This factor comes from the relationship between feet, miles, seconds, and hours.
What are common real-life examples of speeds in ft/s and mph?
A brisk walking speed is about 6 ft/s (4.1 mph), a sprinter may reach 30 ft/s (20.45 mph), and a city speed limit might be 44 ft/s (30 mph).
Why would someone need to convert ft/s to mph in sports or engineering?
Sports timing systems, wind tunnels, and engineering projects often measure speed in ft/s, but mph is more familiar for everyday use and regulations. Converting helps compare and communicate results.
Can I use this conversion for wind speed or running speed?
Yes! This conversion is valid for any speed, including wind, running, cycling, or machinery, as long as the original measurement is in feet per second.
What are the most common mistakes when converting ft/s to mph?
A common mistake is using the wrong conversion factor or confusing ft/s with m/s. Always use 0.681818 for ft/s to mph, and double-check your units.
How accurate is the ft/s to mph conversion for scientific calculations?
The conversion is exact for standard definitions (1 mile = 5280 feet, 1 hour = 3600 seconds). For most practical and scientific uses, this is sufficiently accurate.

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