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.
Speed Conversion Questions Answered
km/h, mph, m/s, ft/s, knots, Mach, pace formulas, context, and exact factors
Core Speed Conversions
Divide by 1.60934: km/h ÷ 1.60934 = mph. Example: 100 km/h = 62.14 mph. Quick approximation: multiply by 0.6 (100 × 0.6 = 60 mph within 3 %). For the exact reverse, multiply by 1.60934: 60 mph = 96.56 km/h. The exact factor is 1 international mile = 1,609.344 metres, so 1 mph = 1609.344 m/hr = 1.60934 km/h.
60 mph = 96.56 km/h (60 × 1.60934). 100 km/h = 62.14 mph (100 ÷ 1.60934). Other common road values: 30 mph = 48.28 km/h; 70 mph = 112.65 km/h; 120 km/h = 74.56 mph; 80 km/h = 49.71 mph. These come up constantly when comparing speed limits, vehicle specs, and race results across countries that use different unit systems.
Multiply by 3.6: m/s × 3.6 = km/h. Example: 10 m/s = 36 km/h. The factor 3.6 comes from unit analysis: 1 m/s = 1 m/s × (1 km / 1000 m) × (3600 s / 1 hr) = 3.6 km/h. In reverse, divide by 3.6: 72 km/h = 20 m/s. The m/s ↔ km/h pair is the most common conversion in physics classwork, engineering calculations, and scientific papers.
Knots to km/h: kn × 1.852 = km/h. Example: 20 knots = 37.04 km/h. Knots to mph: kn × 1.15078 = mph. Example: 100 knots = 115.08 mph. One knot (kn) is defined as exactly 1 nautical mile per hour, and 1 nautical mile = 1,852 metres. That exact 1.852 ratio comes from the nautical mile's original definition tied to arc-minutes of latitude.
Divide 60 by the speed in km/h: 60 ÷ km/h = min/km. Example: 10 km/h = 6:00 min/km (60 ÷ 10 = 6 minutes per km). 12 km/h = 5:00 min/km; 15 km/h = 4:00 min/km; 20 km/h = 3:00 min/km. For mph to min/mile: 60 ÷ mph = min/mile. Pace and speed are mathematical inverses a faster speed means a lower (smaller) pace number.
Three steps: (1) Type any speed value integers and decimals both work (e.g., 65.5 mph, 100 km/h, 5.5 m/s, 250 kn). (2) Select the source unit from the dropdown: km/h, mph, m/s, ft/s, kn, min/km, min/mi, or Mach. (3) All other units update instantly. Tap Copy next to any row to copy that value directly to clipboard. Free, no login, mobile-friendly at untangletools.com/unit/category/speed.
Yes decimal inputs are fully supported. Examples: 65.5 mph → 105.42 km/h; 5.5 m/s → 19.8 km/h; 1.5 Mach → 1,837 km/h. The tool uses 64-bit floating-point precision throughout no intermediate rounding. This matters for engineering calculations where 0.01 m/s can be significant, and for running pace conversions where a few seconds per km changes training zones.
min/km to km/h: 60 ÷ pace(min/km) = km/h. Example: 5:00 min/km = 60 ÷ 5 = 12 km/h. km/h to min/km: 60 ÷ km/h = min/km. Example: 10 km/h = 60 ÷ 10 = 6:00 min/km. For min/mile: 60 ÷ mph = min/mile. The relationship is a reciprocal pace and speed move in opposite directions. This catches people out: going from 5:00 to 4:30 min/km is not a 10 % speed increase; it's 60/4.5 = 13.33 km/h vs 12 km/h an 11.1 % increase.
Using the Tool
Ground speed is how fast an aircraft moves over Earth's surface GPS-measured, expressed in knots or km/h. Indicated airspeed (IAS) is what the pitot tube reads, corrected for instrument error used for stall and structural limits. True airspeed (TAS) accounts for air density at altitude; at 35,000 ft, TAS may be 480 kn while IAS reads only 290 kn. A tailwind adds to ground speed but not to airspeed. Converting between these requires both a speed unit conversion and atmospheric data the converter handles the unit portion (kn ↔ km/h ↔ mph) while a flight computer or E6B handles density altitude corrections.
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