Kilometres per hour to Mach — km/h to Mach
Enter a value to convert kilometres per hour (km/h) to Mach (Mach). Works in your browser with no sign-up.
Kilometres per hour · km/h
Mach · Mach
1 km/h = 0.0008162732 Mach
Formula
1 km/h = 0.0008162732 Mach
Multiply the number of kilometres per hour by 0.0008162732 (or divide by 1,225.08). For example, 40 km/h × 0.0008162732 = 0.03265093 Mach. Mach depends on air temperature, so Mach figures here are approximate.
Quick Reference — Kilometres per hour to Mach
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
→Mach 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
FAQ — Kilometres per hour to Mach
How do I convert kilometres per hour to Mach?
Multiply the number of kilometres per hour by 0.0008162732 (or divide by 1,225.08). For example, 40 km/h × 0.0008162732 = 0.03265093 Mach. Mach depends on air temperature, so treat Mach results as approximate.
How many Mach are in one kilometre per hour?
1 kilometre per hour = 0.0008162732 Mach (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.