Conversion Calculators

Speed converter

Convert a single m/s value into km/h, mph, ft/s, and knots.

Speed Converter (m/s ↔ km/h ↔ mph ↔ ft/s)

Table of contents

◦Speed Converter
◦Formula
◦How to use
◦FAQ

Speed Converter

Enter a speed in meters per second and the calculator instantly shows the equivalent in kilometers per hour, miles per hour, feet per second, and knots.

The exact conversion factors:

  • 1 m/s = 3.6 km/h
  • 1 m/s = 2.23694 mph
  • 1 m/s = 3.28084 ft/s
  • 1 m/s = 1.94384 knots

Formula

km/h = m/s × 3.6

mph = m/s × 2.23694

ft/s = m/s × 3.28084

knots = m/s × 1.94384

How to use

  1. Enter the speed in m/s.
  2. Read the equivalent in km/h, mph, ft/s, and knots — they all update instantly.

FAQ

Why m/s as the base unit?

m/s is the SI unit for speed, so every other unit converts via a single multiplier. Conversions go faster and rounding errors are smaller than chaining intermediate units.

How accurate is the mph conversion?

1 m/s = 2.2369362920544 mph exactly. We use 2.23694 (rounded to 5 decimals), accurate to within 0.0001%.

What's the difference between knots and mph?

A knot is one nautical mile per hour (1.852 km/h), used in maritime and aviation. mph is the statute mile per hour, used in cars in the US/UK. 1 knot ≈ 1.15 mph.