With a total of forty runners going to post in the Grand National, much talk is about how many of those lining up will be capable of completing the challenging course. With a trip of Four and a half miles to navigate and a total of 30 fences to jump, it is an achievement in itself for any horse to complete the Aintree Grand National and betting on this outcome has become increasingly popular in recent years.
Only once in the last ten years has more than half the field managed to complete the course, with most of the runners being found out by the grueling test of stamina or coming unstuck at one of the fences. Going also has an influence on the number of finishers in the Grand National with soft ground or worse resulting in fewer finishers and good ground tending to see more horse past the finishing post. Only four finsihed on heavy ground in 2001 whilst the average number of finishers in the past 15 years has been just 13, meaning an average of 27 of those who have gone to post have failed to make it round.
Less than 12 - 7/4
Between 12 and 18 - 2/5
19 or more finishers - 11/4
Odds by Betfair
| Year | Going | No. of Finishers |
| 2009 | Good | 17 |
| 2008 | Good | 15 |
| 2007 | Good | 12 |
| 2006 | Good to soft | 9 |
| 2005 | Good to soft | 21 |
| 2004 | Good | 11 |
| 2003 | Good | 14 |
| 2002 | Good | 11 |
| 2001 | Heavy | 4 |
| 2000 | Good | 17 |
| 1999 | Good | 18 |
| 1998 | Soft | 6 |
| 1997 | Good | 17 |
| 1996 | Good | 17 |
| 1995 | Good | 15 |

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