Another way to interpret WAR is by converting it into runs. For each 1 WAR, that player is expected to contribute about 10 more runs to the team. Trea Turner’s WAR was 6.9 so he contributed about 69 runs more than your average player would. Zack Wheeler’s WAR was 7.3, so in the case of a pitcher, we would say he was individually responsible for 7.3 Wins or allowing 73 fewer runs over the course of the season. Your average baseball score throughout history would probably be 5-4 (all rules equal between leagues) or 9 total runs scored, which is where the assumption of 10 runs equaling one win comes from.
You can then use this conversion to calculate exactly how many runs you think would be missing from the lineup if one of your players is hurt. For example, if Trea Turner is a 6.9 WAR player but he will be out of the lineup for the next game. I would use the number of expected runs for Turner for the season at 69 and I would divide it by 162 games to determine how many runs per game he contributes. With all other things equal, I would project that lineup loses about 0.426 runs per game with Trea Turner out on any given day. Considering 1 run can make the difference, losing almost half a run for a game is a LOT. There are obviously tons of other factors that are in play here, but this calculation gives us a good idea of what his loss means.
This statistic has also made its way into the language of contracts, and it is used as a bit of a base when it comes to negotiating contracts. For each 1 WAR, a player is expected to be worth about $8 million. So that’s why you see people saying these guys like Mike Trout and Mookie Betts are underpaid. Because they should be getting closer to $50 million per year considering how much they contribute to their club. Currently, Mike Trout has the largest contract in MLB history for a position player at about $36 million per year. However, considering he is currently projected by Fangraphs to finish 2022 with a WAR of 7.0, he should probably be getting paid closer to $54 million for the season.