Speeds of light to feet per second Converter

Enter the speeds of light, then press Calculate. The feet 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 light and the next step needs feet per second. The number stays blank until you press Calculate, so a half-typed entry is never mistaken for the answer.

The factor

Multiply by the factor: 1 speed of light = 9.83571e+08 feet per second.

A worked example

10 speeds of light are 9.83571e+09 feet 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 feet per second to speeds of light. A nearby pair in the same units is centimeters per second to feet per second. When the converted number is the input to a job, continue with the speed from distance and time.