Speeds of sound to kilometers per second Converter

Enter the speeds of sound, then press Calculate. The kilometers per second stay hidden while you type.

Press Calculate after the entries are in.

What this speed conversion is for

Use this page when a measurement is written in speeds of sound and the next step needs kilometers per second. The number stays blank until you press Calculate, so a half-typed entry is never mistaken for the answer.

The factor

1 speed of sound = 0.34029 kilometers per second. Mach and the speed of sound on this page both use 340.29 meters per second, the sea-level value near 15°C. Real sound speed changes with air temperature.

A worked example

10 speeds of sound are 3.4029 kilometers per second. Multiply the result by the reverse factor if you want the original number back.

How to check it

Write the factor down, do the multiply on paper, and compare it with the result card. If you change a sentence on this page, edit the HTML file and reload. The form and this note live in the same file.

The reverse conversion is kilometers per second to speeds of sound. A nearby pair in the same units is speeds of sound to centimeters per second. When the converted number is the input to a job, continue with the speed calculator.