Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
(12in * 18in in m^2) * 7.66kWh/m^2 * 21.5%
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
