Speed Converter Tools – Convert KMH, MPH, MPS, Knots & FPS
Use these speed converter tools to switch quickly between kilometers per hour (km/h), miles per hour (mph), meters per second (m/s), knots, and feet per second (ft/s). Each calculator provides instant results, clear formulas, and a consistent, mobile-first interface.
Whether you’re analyzing pace in sports, comparing car speeds, or planning navigation for boating and aviation, this hub gives you accurate conversions built on exact standards (e.g., mph ↔ m/s uses 1 mph = 0.44704 m/s).
KMH to MPH
Convert kilometers per hour to miles per hour.
MPH to KMH
Convert miles per hour to kilometers per hour.
KMH to MPS
Turn km/h into meters per second instantly.
MPS to KMH
Convert m/s to km/h with precise factors.
MPH to MPS
Convert mph to meters per second accurately.
MPS to MPH
Convert m/s to miles per hour quickly.
KMH to Knots
Convert kilometers per hour to knots (nautical).
Knots to KMH
Convert knots to km/h for maritime and aviation.
Knots to MPS
Convert knots to meters per second.
MPS to Knots
Convert meters per second to knots.
FPS to MPH
Convert feet per second to miles per hour.
MPH to FPS
Convert miles per hour to feet per second.
Core Speed Conversion Relationships
-
mph = km/h ÷ 1.609344•km/h = mph × 1.609344(exact) -
m/s = km/h ÷ 3.6•km/h = m/s × 3.6 -
m/s = mph × 0.44704(exact) •mph = m/s ÷ 0.44704 -
knots = km/h ÷ 1.852•km/h = knots × 1.852 -
m/s = knots × 0.514444(exact) •knots = m/s ÷ 0.514444 -
mph = (ft/s) × 0.681818•ft/s = mph × 1.46667
Common Use Cases
- Automotive & cycling (mph ⇄ km/h, mph ⇄ m/s for acceleration tests)
- Running & field sports (m/s, ft/s for sprint analysis and drills)
- Boating & aviation (knots ⇄ km/h / m/s for navigation planning)
- Education & physics labs (prefer SI unit m/s with exact factors)
Accuracy & Best Practices
- Use exact constants where defined (e.g., 1 mph = 0.44704 m/s; 1 knot = 0.514444 m/s).
- For sport pacing, decimals to 2–3 places are usually sufficient; for engineering, keep more precision.
- Confirm whether local signage/telemetry uses mph or km/h to avoid misinterpretation.
Frequently Asked Questions
How do you convert km/h to mph?
Use mph = km/h ÷ 1.609344. For example, 100 km/h ≈ 62.1371 mph.
How do you convert mph to m/s?
Use m/s = mph × 0.44704 (exact). Example: 60 mph × 0.44704 ≈ 26.8224 m/s.
What are knots and where are they used?
A knot is a nautical speed unit equal to 1 nautical mile per hour (1 knot ≈ 1.852 km/h ≈ 0.514444 m/s). It’s common in marine and aviation contexts.
How do you convert feet per second to mph?
Use mph = (ft/s) × 0.681818. Conversely, ft/s = mph × 1.46667.
Which unit is best for science and engineering?
Meters per second (m/s) is the SI unit for speed and is preferred in scientific and engineering work.
Example Conversions
- 100 km/h ≈ 62.1371 mph
- 60 mph ≈ 26.8224 m/s
- 10 m/s ≈ 22.3694 mph
- 20 knots ≈ 37.04 km/h ≈ 10.2889 m/s
- 88 ft/s ≈ 60 mph
Bookmark this speed hub for quick access to common conversions. All tools share the same simple layout and instant-result design so you can move between units without friction.