To help myself and my MtG group learn the game I made this damage calculator. I also wanted something to practice some coding on as I hadn't done any in a long time and was starting to feel rusty. Will most likely update this with more things as I understand the game better and improve some skills.
Test it for yourself and if you use it in your games give me a shout!
Go to the live page and enter in the stats for your Attacker and Blocker cards. Select any attributes that apply like First Strike, Deathtouch, etc, and hit the Battle button!
Not much at the moment but I'm planning things ahead for practice. Almost everything I had planned with a few things left 
- Calculate damage
- Apply First Strike 1
- Apply Double Strike 1
- Apply Deathtouch
- Apply Lifelink
- Apply Indestructible
- Apply Cannot Block
- Apply Trample 2
- Apply Flying 2
- Apply Reach 2
- Calculate if Planeswalker 2
- Explain calculation3
- Calculate any counters4