Enter your weight in pounds, elevation gain in feet, time in minutes and seconds.

Caveat: Only part of the story is told by Watts (whether on the flats or climbing) so be sure to review: Torque.
 

Elevation Gain:	ft
I'm afraid I can't do that, Dave. Try numbers greater than zero with maybe one decimal. I am sure you will agree it is important to enter a number, Dave.
Your Weight:	lbs
I am truly sorry I can't do that, Dave. Try numbers greater than zero in both fields. Dave, I hope you understand it is mission critical you enter numbers in both fields.
Time:	min      secs
I hate to interrupt Dave, but numbers are better for minutes. Dave, numbers are really better for minutes.
Dave, I do prefer you use a number for seconds. Dave, need I remind you to put numbers in all fields.