Net run rate

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Net Run Rate (NRR) is a statistic used in the sport of cricket. It is the most commonly used method of separating teams in one-day league competitions, effectively acting as the Cricket equivalent of "goal difference" in football/soccer.

[edit] Description in the Laws of the Game

"A team's net run rate is calculated by deducting from the average runs per over scored by that team, the average runs per over scored against that team.

In the event of a team being all out in less than its full quota of overs, the calculation of its net run rate shall be based on the full quota of overs to which it would have been entitled and not on the number of overs in which the team was dismissed."

[edit] Step by step explanation

A teams run rate (RR) is their total number of runs divided by overs faced. Now as an over is six balls if an over isn't completed then you need to do a little calculation to find what to divide by.

For example: 40.1 is actual 40 overs and one sixth of an over. Thus, for the purpose of the runrate calculation, if a team reaches their target in 40.1 over the team has faced 40 + 1/6 = 40.167 (3 d.p.) overs.

If another ball is bowled, they have now faced 40 + 2/6 = 40.333 (3 d.p.) overs. After the next ball (40.3 in normal cricket terms) it's the more user friendly 40.5 as we're halfway through the over.

So if a team scores 250 runs off 50 overs then their runrate is 250/50 = 5. If they got that same score off 47.3 overs, their RR would be 250 / 47.5 = 5.26 (2 d.p.)

Net Run Rate simply involves taking your opponents final runrate away from your own runrate. The only slight complication is that now, if a team is bowled out, it is not the balls faced which their score is divided by; instead the full fifty over quota is used

[edit] Scenarios

1. Side that bats first wins

  • Team A bats first and sets a target of 287-6 off their full quota of fifty overs. Team B fails in their run chase, early losses causing them to struggle to 243-10
  • Team A's runrate is 287 / 50 = 5.74
  • Team B's runrate is 243 / 50 = 4.86
  • Team A's NRR for this game is 5.74 - 4.86 = 0.88 . If this was the first game of the season, their NRR for the league table would be +0.88
  • Team B's NRR for this game is 4.86 - 5.74 = -0.88 . If this was the first game of the season, their NRR for the league table would be -0.88

2. Side that bats second wins

  • Team A bats first and sets a target of 265-8 off their full quota of fifty overs. Team B successfully chases, getting their winning runs with a four with sixteen balls remaining, leaving them on 267-5
  • Team A's runrate is 265 / 50 = 5.12
  • Team B faced 47.2 overs and so their runrate is 267 / 47.333... = 5.64084... = 5.64 (2 d.p.)
  • Therefore Team A's net run rate for this game is 5.12 - 5.64084... = -0.52084... . If their net run rate for this season was previous +1.52 it is now +0.99916... = +1.00
  • Therefore Team B's net run rate for this game is 5.64084... - 5.12 = +0.52084... . If their net run rate for this season was coincidentally also previously +1.52 it is now = +2.04

3. Side that bats first is bowled out. Side batting second wins.

  • Team A bat first and are skittled out for 127 off 25.4 overs. Team B reaches the target for the loss of four wickets off 25.5 overs.
  • Despite Team A's runrate for the balls they faced being 127 / 25.667 = 4.95 (2dp) because they were bowled out their run rate is worked out over the 50 over quota; 127 / 50 = 2.54
  • Team B actually scored at a slower pace, however they managed to protect their wickets. Therefore they use their balls faced runrate; 128 / 25.833 = 4.95 (2 dp)
  • Team A's NRR for this match is 2.54 - 4.95 = -2.41 and would be added (adding a minus to a positive having the effect of subtracting) to their seasons NRR.
  • Team B's NRR for the match is 4.95 - 2.54 = +2.41 and would be added to their seasons NRR.

4. Side that bats second is bowled out. Side batting first wins.

  • Team A bat first and set a formidable 295-7 off their compliment of 50 overs. Team B never gets close, being bowled out for 184 off 35.4 overs.
  • Team A's runrate is 295 / 50 = 5.9
  • Team B's runrate is taken over 50 overs as they were bowled out; 184 / 50 = 3.68
  • Team A's NRR for this match is 5.9 - 3.68 = +2.22 and would be added to their seasons NRR.
  • Team B's NRR for the match is 3.68 - 5.9 = -2.22 and would be added to their seasons NRR.

5. Both sides are bowled out, the team batting first therefore taking the points.

  • Team A bat first manage 117 off 24 overs on a testing track. Team B fall agonizingly short, reaching 112 off 23.3 overs.
  • As they were bowled out Team A's runrate is 117 / 50 = 2.34 (2dp)
  • As Team B were also bowled out their run rate is 112 / 50 = 2.24 (2dp)
  • Team A's NRR for this match is 2.34 - 2.24 = +0.10 and would be added to their seasons NRR.
  • Team B's NRR for the match is 2.24 - 2.34 = -0.10 and would be added to their seasons NRR.

6. The game ends in a tie

The teams runrates are equal and so both sides NRR for that season would be unaffected.

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