Download an Excel Document that tracks games and calculates NRR. Please follow this thread in the forums for more information.
Here's how NRR works.
(SUM(Team A Runs)/SUM(Team A Overs)) - (SUM(Team B Runs)/SUM(Team B Overs))
Springs 84 (16) d Icons 69 (16)
Springs 72 (16) d Unicorns 51 (16)
Springs NRR => (156/32) - (120/32) = 1.125
If a team is all out, they automatically assume the maximum overs for the game.
NRR will not round out to 0.00 overall. The nature of averages won't allow it. After the 2nd game for a team, it's NRR average will decrease or increase marginally. In the case of a tied game, NRR in *that* game will be 0.00.