Mach to Kilometres per hour — Mach to km/h
Enter a value to convert Mach (Mach) to kilometres per hour (km/h). Works in your browser with no sign-up.
Formula
1 Mach = 1,225.08 km/h
Multiply the number of Mach by 1,225.08. For example, 1 Mach × 1,225.08 = 1,225.08 km/h. Mach depends on air temperature, so Mach figures here are approximate.
Quick Reference — Mach to Kilometres per hour
About Speed Units
Kilometres per hour is the road-speed unit in most countries; the US and UK use miles per hour. Knots (one nautical mile per hour) are used at sea and in aviation. Mach expresses speed as a multiple of the speed of sound, which depends on air temperature; this converter uses 340.3 m/s, the value for the standard atmosphere at sea level (15 °C).
Related Conversions
All Speed Conversions
→Kilometres per hour to miles per hour
→Knots to kilometres per hour
→Metres per second to miles per hour
→Miles per hour to kilometres per hour
→Metres per second to kilometres per hour
→Knots to miles per hour
→Kilometres per hour to knots
→Miles per hour to metres per second
→Kilometres per hour to Mach
FAQ — Mach to Kilometres per hour
How do I convert Mach to kilometres per hour?
Multiply the number of Mach by 1,225.08. For example, 1 Mach × 1,225.08 = 1,225.08 km/h. Mach depends on air temperature, so treat Mach results as approximate.
How many kilometres per hour are in one Mach?
1 Mach = 1,225.08 km/h (shown to up to 7 significant figures).
What is Mach 1 in km/h?
In the standard atmosphere at sea level (15 °C) the speed of sound is about 340.3 m/s, which is about 1,225 km/h or 761 mph. It is lower in colder air, so at typical airliner cruising altitude it is closer to 1,060 km/h.
Does this converter work offline?
Yes. Once the page has loaded, conversions run entirely in your browser and nothing is sent to a server.