ESPN has a Football Power Index that they use to rank all 130 FBS teams (description below). Included in this ranking is a Strength of Schedule ranking as well.
The Big 12 has done very well on both:
"The Football Power Index (FPI) is a measure of team strength that is meant to be the best predictor of a team's performance going forward for the rest of the season. FPI represents how many points above or below average a team is. Projected results are based on 20,000 simulations of the rest of the season using FPI, results to date, and the remaining schedule. Ratings and projections update daily."
The Big 12 has done very well on both:
Average of FPI | |||||||||||||||||||
Conf | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 Proj | Avg FPI | ||||||||||
SEC | 25.4 | 29.8 | 35.5 | 38.4 | 29.2 | 32.2 | 39.5 | 28.8 | 32.3 | ||||||||||
B12 | 40.1 | 41.9 | 41.3 | 39.7 | 39.1 | 39.9 | 37.6 | 29.1 | 38.6 | ||||||||||
PAC | 32.7 | 38.3 | 40.6 | 42.0 | 45.3 | 42.0 | 43.4 | 61.3 | 43.2 | ||||||||||
ACC | 45.9 | 46.6 | 39.5 | 35.5 | 47.1 | 56.4 | 54.4 | 40.6 | 45.8 | ||||||||||
47.9 | 50.9 | 50.7 | 45.3 | 41.6 | 41.9 | 41.5 | 40.7 | 45.1 | |||||||||||
P5 Total | 38.5 | 41.6 | 41.6 | 40.2 | 40.4 | 42.7 | 43.6 | 40.1 | 41.1 |
Average of SOS | |||||||||
Conf | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 Proj | Avg SOS |
SEC | 19.4 | 19.7 | 29.0 | 38.7 | 27.4 | 25.1 | 11.6 | 19.3 | 23.8 |
B12 | 26.9 | 29.0 | 29.0 | 29.2 | 26.7 | 26.0 | 22.2 | 9.1 | 24.8 |
PAC | 19.3 | 27.6 | 23.4 | 34.7 | 35.8 | 25.1 | 73.3 | 65.8 | 38.1 |
ACC | 46.1 | 39.9 | 33.6 | 23.7 | 44.3 | 57.9 | 36.9 | 39.7 | 40.3 |
b10 | 50.6 | 48.5 | 47.4 | 40.1 | 30.1 | 31.1 | 41.1 | 36.7 | 40.7 |
P5 Total | 33.2 | 33.3 | 33.0 | 33.5 | 33.2 | 33.7 | 36.8 | 34.7 | 33.9 |
"The Football Power Index (FPI) is a measure of team strength that is meant to be the best predictor of a team's performance going forward for the rest of the season. FPI represents how many points above or below average a team is. Projected results are based on 20,000 simulations of the rest of the season using FPI, results to date, and the remaining schedule. Ratings and projections update daily."