Speed Unit Converter
Convert between km/h, mph, m/s, ft/s, knots, Mach, min/km, and min/mi in one step. Built for drivers, pilots, sailors, runners, physicists, and engineers — type once, copy any result instantly.
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Units Supported
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Every Speed Unit, Anchored to m/s
All supported units with conversion factors to and from meters per second — the SI base unit of speed
| Unit | Abbr. | To m/s | From m/s | Equivalence | Primary Use |
|---|---|---|---|---|---|
| Kilometers per hour | km/h | ÷ 3.6 | × 3.6 | 1 km/h = 0.2778 m/s | Road speeds, weather wind, cycling |
| Miles per hour | mph | × 0.44704 | ÷ 0.44704 | 1 mph = 1.60934 km/h | US/UK roads, aviation indicated airspeed |
| Meters per second | m/s | × 1 | × 1 | SI base unit of speed | Physics, engineering, science |
| Feet per second | ft/s | × 0.3048 | ÷ 0.3048 | 1 ft/s = 0.3048 m/s | US engineering, ballistics, sports |
| Knot | kn | × 0.514444 | ÷ 0.514444 | 1 kn = 1 nautical mile/hr | Aviation, marine navigation |
| Minutes per kilometer | min/km | 1000 ÷ (v×60) | 1000 ÷ (v×60) | Pace — inverse of speed | Running, cycling, triathlon |
| Minutes per mile | min/mi | 1609.34 ÷ (v×60) | 1609.34 ÷ (v×60) | Pace — inverse of speed | Road running, marathon timing |
| Mach number | Mach | × 343 | ÷ 343 | 1 Mach ≈ 343 m/s (sea level) | Aerospace, supersonic aircraft |
Why m/s is the anchor: The metre per second is the SI coherent unit for speed — it combines two SI base units (metre and second) with no conversion factor. All other speed units convert to m/s via exact multiplication or division. Pace units (min/km, min/mi) are reciprocals of speed, so converting them involves 60 ÷ pace rather than direct multiplication.
Direct Factors for the Most Common Pairs
All multipliers for every pair you'll actually use — verify any tool result manually
| Convert | Factor | Example |
|---|---|---|
| km/h → mph | ÷ 1.60934 | 100 km/h = 62.14 mph |
| mph → km/h | × 1.60934 | 60 mph = 96.56 km/h |
| km/h → m/s | ÷ 3.6 | 72 km/h = 20 m/s |
| m/s → km/h | × 3.6 | 10 m/s = 36 km/h |
| m/s → mph | × 2.23694 | 5 m/s = 11.18 mph |
| mph → m/s | × 0.44704 | 30 mph = 13.41 m/s |
| m/s → ft/s | × 3.28084 | 1 m/s = 3.281 ft/s |
| ft/s → m/s | × 0.3048 | 10 ft/s = 3.048 m/s |
| kn → km/h | × 1.852 | 20 kn = 37.04 km/h |
| km/h → kn | ÷ 1.852 | 100 km/h = 53.99 kn |
| kn → mph | × 1.15078 | 100 kn = 115.08 mph |
| mph → ft/s | × 1.46667 | 60 mph = 88 ft/s |
From Walking Pace to Orbital Velocity
12 reference speeds across km/h, mph, and m/s — putting every unit in context
| Reference | km/h | mph | m/s | Context |
|---|---|---|---|---|
| Average Walking | 5 | 3.1 | 1.39 | Normal human walking pace |
| Brisk Walk / Hike | 6–7 | 3.7–4.3 | 1.7 | Fast walking or light hiking |
| Easy Jog | 8 | 5.0 | 2.22 | Casual running / warm-up pace |
| Marathon Pace (elite) | 20.1 | 12.5 | 5.59 | Eliud Kipchoge world record pace |
| Sprint (elite human) | 44.7 | 27.8 | 12.4 | Usain Bolt peak speed (100 m) |
| Urban Speed Limit | 50 | 31 | 13.9 | Typical city road limit worldwide |
| Highway / Motorway | 100–130 | 62–81 | 27.8–36.1 | Typical freeway speed limit |
| High-Speed Train | 300 | 186 | 83.3 | TGV / Shinkansen cruise speed |
| Commercial Airliner | 900 | 560 | 250 | Boeing 737 / Airbus A320 cruise |
| Speed of Sound | 1,235 | 767 | 343 | Mach 1 at sea level, 20 °C |
| SR-71 Blackbird | 3,529 | 2,193 | 980 | Fastest crewed air-breathing aircraft |
| Low Earth Orbit | 27,600 | 17,150 | 7,667 | ISS orbital speed |
The 88 ft/s rule: 60 mph = exactly 88 ft/s. This is one of the most useful mental shortcuts in US engineering — 1 mph ≈ 1.467 ft/s, and at highway speeds (65 mph = 95.3 ft/s) it lets engineers quickly estimate stopping distances in feet rather than converting through metres. The metric equivalent: 100 km/h = 27.78 m/s ≈ 28 m/s, another useful round-number anchor.
Speed to Pace — km/h, min/km, and min/mi
Eight training speeds decoded across every unit — from easy jog to elite race pace
| km/h | m/s | min/km | min/mile | Training Zone |
|---|---|---|---|---|
8 | 2.22 | 7:30 | 12:04 | Easy recovery run |
10 | 2.78 | 6:00 | 9:39 | Moderate run / zone 2 |
12 | 3.33 | 5:00 | 8:03 | Tempo run pace |
14 | 3.89 | 4:17 | 6:54 | 10 K race pace (club) |
16 | 4.44 | 3:45 | 6:02 | 5 K race pace (competitive) |
20 | 5.56 | 3:00 | 4:50 | Elite 5 K / marathon threshold |
25 | 6.94 | 2:24 | 3:52 | Elite sprinter sustained |
30 | 8.33 | 2:00 | 3:13 | Track sprint (short burst) |
Pace is a reciprocal of speed. Doubling your speed halves your pace — but halving your pace time does not double your speed in km/h. Going from 6:00 min/km (10 km/h) to 3:00 min/km (20 km/h) is a 100 % speed increase, but only a 50 % reduction in pace number. This non-linear relationship is why runners always use a pace calculator rather than estimating the conversion mentally.
Speed Conversion Across Every Domain
Drivers, pilots, sailors, and athletes — the unit changes, the tool stays the same
Road & Automotive
Speed limits, dashboards, and navigation apps switch between km/h and mph depending on the country. German Autobahn has no general limit; US interstates cap at 75–85 mph; Australia uses km/h throughout. Drivers crossing borders, importing vehicles, or reading international road-test reviews convert constantly between the two.
Aviation & Aerospace
Pilots work in knots (kn) for airspeed and altitude — ICAO standard worldwide. Air traffic control uses knots for wind, aircraft report Mach numbers above FL280, and ground speed may be shown in km/h on some glass cockpits. Converting between knots, mph, km/h, and Mach is routine in pre-flight planning and aerospace engineering.
Marine & Weather
Maritime navigation uses knots exclusively — defined as one nautical mile per hour (1.852 km/h). Weather bulletins in the US report wind in mph; Europe uses km/h; aviation METARs use knots. Storm-force Beaufort scales map to both knots and km/h, making multi-unit fluency essential for sailors, forecasters, and coastal engineers.
Running, Cycling & Fitness
Treadmills display km/h or mph; GPS watches show pace in min/km or min/mi; race results are posted in both. A 4:30/km pace equals 13.3 km/h; a 7:00/mi pace equals 8.6 mph. Athletes training with international resources convert daily — and pace is non-linear, so a calculator beats mental arithmetic every time.
Type, Select, Copy
From input to clipboard in three steps — desktop and mobile, any speed unit
Enter any speed value
Type an integer or decimal — 65.5 mph, 100 km/h, 5.5 m/s, 250 kn, 1.5 Mach. Pace formats like 5:30 for min/km are also accepted.
Choose the source unit
Select from km/h, mph, m/s, ft/s, kn, min/km, min/mi, or Mach. All outputs update the instant you pick — no button to press.
Copy any result instantly
Tap Copy beside any output row to place that value in your clipboard — ready to paste into a spreadsheet, report, or training app.
Speed Conversion Questions Answered
km/h, mph, m/s, ft/s, knots, Mach, pace — formulas, context, and exact factors
Core Speed Conversions
Using the Tool
Aviation, Marine & Running
Advanced & Niche
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