Week 3, Ravens at Jaguars
4th-and-2, 2:14 remaining in 4th quarter, Down by 1
The Ravens went for it on a 4th-and-2 on the Jaguars’ 49. The NYT 4th Down Bot agrees.
If you disagree

The coach and I agree that going for it is the thing to do here, but you may be thinking it makes sense to punt. That would be the right call if you think the Ravens’ chances of converting on fourth down are less than 23 percent. But based on my analysis, I’d give the Ravens a 55 percent chance to get a first down here.

Here's the full breakdown of my calculations:

Option Chance of converting
Chance of winning
Before play
After play Change
Go for it4th and 2, opp. 49 55% 33% 40% +7%
Punt 33% 31% –2%
Field goal try66 yard kick (est.) <1% 33% 24% –9%
My decision in context

Along with some circuitry to come up with a win probability for every game situation, all you need to figure out what you should do next is an estimate of how likely you are to make a field goal or convert a first down.

My estimates for these are based on the results of thousands of similar plays, but you may think you're smarter than I am. This chart shows you how changing those estimates would change my recommendation.

What to do on 4th-and-2 on opp. 49
Down by 1 with 2:14 remaining in the 4th quarter
What coaches usually do
Punt 85% of the time
Go for it 15% of the time
Field goal try -
Based on about 1,364 fourth downs in similar situations since 2001.
What happened

Joe Flacco pass to the left to Steve Smith Sr. for 5 yards to the Jax44. Tackled by Paul Posluszny. Joe Flacco pass to the left to Steve Smith Sr. for 5 yards to the Jax44. Tackled by Paul Posluszny.

Where did these numbers come from?

To estimate a team’s chances of winning, I use a mathematical model that accounts for a whole lot of variables — including the difference in score, the time remaining in the game, and the number of timeouts each team has left. On top of that, I have models for the likelihood that a team makes a field goal and the likelihood that it will convert a first down.

By combining all of this information, I can come up with the best decision a team can make, according to math.

If you want even more details about the numbers behind my decisions, my full model is available on GitHub. Help make me better!