Just stumbled onto this on the App Store (iOS). Thought I'd share since it has some really handy tools which beginners like myself will find useful. Some of the available tools include:

• Battery Calculators
• Power Plant Calculators
• Prop & Rotor Calculators
• Construction Calculators
• Conversion Tables
• Formulas

There's much more available with some things relevant only for the US market (like flying fields etc).
Here's the download link -> https://itunes.apple.com/us/app/rc-flight-source/id459691193?mt=8

just downloaded... nice app useful

Glad you liked it. 

nice initiation ppcruise 

what about android platforms?........will search n post the same

Thanks chief.. I'm not on Android so can't really comment on that.. I do think that this very app exists on the Google Play Store as well.. Since I doon't have an Android I can't confirm that.. Would be great if somebody can confirm this and share a link for others if possible..