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Mach Number Converter

Convert Mach numbers to m/s, km/h, mph, knots and feet per second, and back again.

What this tool does

Convert Mach numbers to m/s, km/h, mph, knots and feet per second, and back again. Type an amount in mach (standard atmosphere, sea level, 15 °C), choose the units, and the tool converts it to meters per second. It offers 6 speed units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Mach (standard atmosphere, sea level, 15 °C), Meter per second, Kilometer per hour, Mile per hour, Knot, Foot per second. Starts as Mach (standard atmosphere, sea level, 15 °C).
  • To: Choose one of the same 6 units as "From". Starts as Meter per second.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from mach (standard atmosphere, sea level, 15 °C) to meters per second:

  • 1 Ma ≈ 340.294 m/s
  • 5 Ma ≈ 1,701.47 m/s
  • 10 Ma ≈ 3,402.94 m/s
  • 50 Ma ≈ 17,014.7 m/s
  • 100 Ma ≈ 34,029.4 m/s

Multiply the number of mach (standard atmosphere, sea level, 15 °C) by 340.294 to get meters per second. At least one of these units is not an exact definition, so this factor is a rounded value.

Sources: Mach (standard atmosphere, sea level, 15 °C): ISO 2533:1975 Standard Atmosphere. Meter per second: SI Brochure, 9th edition (2019).

Limitations

  • Mach here means the standard-atmosphere sea level value only. At altitude or in warmer or colder air, the same Mach number is a different speed.

FAQs

Q: How fast is Mach 1?
A: At sea level in the ISO standard atmosphere (15 °C), Mach 1 is 340.294 m/s, about 1,225.06 km/h or 761.216 mph.
Q: Why does Mach 1 change with altitude?
A: Mach 1 is the speed of sound, and that depends on air temperature. This page uses the fixed standard sea level value, so it does not follow a real aircraft at altitude.
Q: Can I convert a speed to Mach?
A: Yes. Choose a speed unit in the From box and Mach in the To box.

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