Feet per Second to MPH Converter

Convert feet per second (ft/s) to miles per hour (mph) in one step. Uses exact relationship 1 mph = 1.46667 ft/s, so 1 ft/s = 0.681818 mph. Includes reverse mph to ft/s, presets, and formula.

Full original guide (expanded)

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

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/smph
106.82 mph
2013.64 mph
3020.45 mph
4430.0 mph
8860.0 mph
12081.8 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.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
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Formula (extracted text)
1 mile = 5280 feet 1 hour = 3600 seconds 1 mph = 5280 / 3600 ft/s = 1.466666... ft/s
Formula (extracted text)
mph = ft/s ÷ 1.46667 or mph = ft/s × 0.681818
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
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Formulas

(Formulas preserved from original page content, if present.)

Version 0.1.0-draft
Citations

Add authoritative sources relevant to this calculator (standards bodies, manuals, official docs).

Changelog
  • 0.1.0-draft — 2026-01-19: Initial draft (review required).