Developers! The Measure of Things is pleased to be opening sign-ups for the beta version of its API, which lets you integrate comparative measurements into your own web projects. Click here to learn more.
Bluebulb Projects presents:
The Measure of Things Logo
Enter a measurement to see comparisons

391 meters per hour is about one-twentieth as as Michael Phelps.
In other words, it's 0.055913 times the of Michael Phelps, and the of Michael Phelps is 17.885 times that amount.
(at the Beijing Olympics, 2008; 200 m freestyle) (a.k.a. Michael Fred Phelps) (swimmer; 1985-)
There's more!
Click here to see how other things compare to 391 meters per hour...