If You dont have android device on the table, You can calculate the odds with simple algorithm: get the number of odds, multiply by two and multiply by number of cards left to show. Then subtract couple %.

Example: if You have color draw and two over cards on the flop, then You have 8 color outs and six over outs.
14 outs x 2 = 28
28% x 2 cards left = 56%
minus about 2% = 54%

When i was creating Max Poker Calculator i was thinking "it cant be hard, if there is simple method to calculte".... not so fast. Advanced porker calculators cant use so simple method. It's not accurate enough. And in poker every % matter ;) So poker calculators must get every board combination and then find out who win. Calculation who win is not so simple too. And poker calculator must do this milions times. So it uses advanced mathematics methods to do this, as monte carlo method or poker hand rank tables. It's simplest to calculate odds on the flop. Then we have left thousand combinations.

Ofcourse if You like this app, You can download "donate version"-for pros :)

Some screenshots:

If You playing poker, You have to get this app. Introducing Max Poker Calculator. This fast and very simple calc will calculate odds for 2-10 players post-flop, on flop and on the turn. You can download it from google play.