Meter / Second (m/s)
Kilometer / Hour (km/h)
| Unit | 1 m/s equals |
|---|---|
| Meter / Second (m/s) | 1 |
| Kilometer / Hour (km/h) | 3.6 |
| Mile / Hour (mph) | 2.23694 |
| Foot / Second (ft/s) | 3.28084 |
| Knot (kn) | 1.94385 |
| Mach (Ma) | 0.00291545 |
How it works
- 1 mph = 1.60934 km/h
- 1 knot = 1.852 km/h
- Mach 1 ≈ 1235 km/h
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Frequently asked
How fast is Mach 1?
Approximately 343 m/s or 1,235 km/h at sea level.
Where you'll actually use this
Speed measures distance covered per unit of time. Common units include km/h, mph, m/s, knots, and the speed of light (c).
- Driving
Speed limits use km/h in most countries; mph in the US, UK, and a few others.
- Aviation & maritime
Planes and ships report speed in knots (nautical miles per hour) — 1 kn ≈ 1.852 km/h.
- Running & cycling
Pace apps switch between min/km and min/mi; speed in km/h vs mph depending on locale.
Common mistakes to avoid
- kph isn't a real unit
The correct abbreviation is km/h. 'kph' is informal and not used in technical writing.
- Knots already includes 'per hour'
Saying 'knots per hour' is redundant — it's just 'knots'.
Did you know?
Mach 1 isn't a fixed speed — it depends on temperature. At sea level it's roughly 1,225 km/h, falling to ~1,062 km/h at altitude.
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Accuracy & sources
How this tool is built and verified.
- Source
- Standards-aligned factors
- Last reviewed
- Q2 2026
- Status
- Verified
- International System of Units (SI)BIPM — Bureau International des Poids et Mesures · The International System of Units (SI Brochure), 9th edition
- ISO 80000 — Quantities and UnitsISO / IEC · ISO 80000-1:2022
- Standards aligned
- Formula verified
- Editor reviewed
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