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Convert speed and velocity between km/h, mph, m/s, knots, and ft/s for driving, running pace, sailing, and physics problems.
Unit
Generated on May 23, 2026
Convert speed and velocity between km/h, mph, m/s, knots, and ft/s for driving, running pace, sailing, and physics problems.
A speed converter handles the various ways we describe how fast something moves: kilometers per hour for driving in most countries, miles per hour for driving in the US and UK, meters per second for physics, knots for sailing and aviation, and feet per second for ballistics. Being able to move cleanly between these units is useful for drivers crossing borders, pilots reading charts, runners translating training paces, physicists doing homework, and sailors planning a route.
Formula
Target = Source × (source_to_mps ÷ target_to_mps). 1 mph ≈ 1.609 km/h. 1 knot = 1.852 km/h. 1 m/s = 3.6 km/h.Speed conversions usually happen in one of three moments: you're watching a US Top Gear episode and they say "this thing does 0 to 60 in 4 seconds" and you have no instinct for what 60 mph feels like; you're booking a trip to the UK and trying to figure out how fast 70 mph motorway speed actually is (the answer: 113 km/h, basically Pakistani motorway speed); or you're reading a physics problem in m/s and need to translate it into something your brain can picture. The simplest rule for daily life: mph times 1.6 gives km/h close enough. So 60 mph is 96 km/h, 100 mph is 160 km/h. The trickier conversion is knots, used in aviation and sailing — 1 knot = 1.852 km/h, which is why a 500-knot Boeing 777 cruising over the Gulf is actually doing about 925 km/h ground speed. Pakistani highways post limits in km/h (typically 100-120 km/h on the motorway, 80 on national highways), and your speedometer almost certainly reads km/h primarily with mph in smaller numerals — but the prevalence of imported Japanese and US-spec cars means knowing both is a daily survival skill, especially when reading car reviews or buying tyres rated for max speeds quoted in mph.
A speed converter handles the various ways we describe how fast something moves: kilometers per hour for driving in most countries, miles per hour for driving in the US and UK, meters per second for physics, knots for sailing and aviation, and feet per second for ballistics. Being able to move cleanly between these units is useful for drivers crossing borders, pilots reading charts, runners translating training paces, physicists doing homework, and sailors planning a route.
Meters per second is the SI base, and all conversions route through it. Knots are a nautical convention: 1 knot = 1 nautical mile per hour = 1.852 km/h. The nautical mile itself is defined as 1 minute of arc along a meridian — roughly 1,852 meters — which makes navigation and chart work much easier because the latitude lines on a map correspond directly to travel distance. For land-based problems, the mph/kmh pair is more common.
Common speed conversions for driving, sports, aviation, and physics.
| km/h | mph | m/s | Knots | ft/s |
|---|---|---|---|---|
| 10 | 6.21 | 2.78 | 5.40 | 9.11 |
| 30 | 18.64 | 8.33 | 16.20 | 27.34 |
| 50 | 31.07 | 13.89 | 27.00 | 45.57 |
| 60 | 37.28 | 16.67 | 32.40 | 54.68 |
| 80 | 49.71 | 22.22 | 43.20 | 72.91 |
| 100 | 62.14 | 27.78 | 53.99 | 91.13 |
| 120 | 74.56 | 33.33 | 64.79 | 109.36 |
| 150 | 93.21 | 41.67 | 80.99 | 136.70 |
| 200 | 124.27 | 55.56 | 107.99 | 182.27 |
5 km/h (3.1 mph) is a typical casual walking speed — one city block every 90 seconds.
100 km/h (62 mph) is the cruising speed on most motorways in Pakistan, Europe, and Australia.
Cheetah sprint tops out at 110 km/h (68 mph) — still slower than highway traffic.
A commercial jet cruises at ~900 km/h (560 mph), about 9× highway speed.
60 mph equals 96.56 km/h — the speed limit on most US interstate highways, converted to metric.
100 km/h equals 62.14 mph — the typical motorway speed in Europe and Pakistan, translated for US drivers.
10 m/s equals 36 km/h — useful for physics problems that pair SI units with everyday intuition.
1 knot equals 1.852 km/h (1.151 mph) — a cruise ship at 25 knots is doing about 46 km/h or 29 mph.
Usain Bolt's peak sprint speed was roughly 44.72 km/h or 27.78 mph — the fastest a human has ever officially run.
The speed of sound in air at room temperature is about 343 m/s, or 1,236 km/h — the basis for the Mach number used in aviation.
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