Transfer Portal and Depth Chart Basics for Fans
The transfer portal changes SEC rosters every year, so roster knowledge matters for every SEC game. A team with the same name and logo can field a very different lineup. This guide explains the portal and the depth chart, then shows a simple way to adjust last year's stats for new faces.
Key takeaways
- The portal is an NCAA database where players list themselves to move schools.
- A commitment is a plan. A player counts once he appears on the depth chart.
- Returning production shows how much of last year's output is still on the team.
- Quarterback and offensive line changes move my numbers the most.
What the transfer portal is
The transfer portal is a database run by the NCAA. A player adds his name when he wants to leave his school. Coaches at other schools can then see him and reach out.
A name in the portal is not a done deal. Some players enter and then return to their own team.
How a transfer works, step by step
- A player enters the portal.
- Coaches from other schools contact him.
- He visits campuses and weighs offers.
- He commits to a new school.
- He enrolls, joins the roster, and competes for playing time.
I treat a commitment as a plan. The player counts only after he shows up on the depth chart.
Why SEC rosters turn over so fast
Three forces drive the churn. First, players can move more freely than they could years ago. Second, schools compete hard for talent, and NIL deals and revenue sharing give players real money to weigh. Third, coaches use the portal to fill holes after seniors leave or after a weak season.
The result is a roster that can look very different from last year's. A team with the same name and the same logo may not be the same team.
The 105-player roster cap
Top-tier football rosters now cap at 105 players. That replaced the old limit of 85 scholarships. A cap forces hard choices. Every new transfer pushes someone else down the list or off the roster.
Depth chart terms
| Term | Meaning |
|---|---|
| Depth chart | A ranked list of players at each position. |
| Starter | The player who opens the game at a position. |
| Backup | The first player to step in. |
| Two-deep | The starter and the first backup at every position. |
| Co-starter | Two players listed with an "or" between them. The job is still open. |
| Redshirt | A player who sits out games to save a year of eligibility. |
| Snap count | The number of plays a player is on the field. |
How to read a depth chart
A depth chart lists each position from first string to last. The top name starts. The next name steps in if the starter gets hurt or tires out.
Treat a posted chart as a plan. Coaches can change it on game day, and some schools post one only when they must. An "or" between two names tells you the staff has not picked a winner.
A sample depth chart, line by line
Take a made-up team. At quarterback, the chart lists Player A first and Player B second. At left tackle, it lists Player C or Player D.
The quarterback job looks settled, and Player B is the backup. The left tackle spot is open, because the "or" means the staff has not chosen. After the first game, check the snap counts. They show who won the job.
Position groups and starters
Each side fields 11 players at a time. Most defenses use a mix like the one below, though schemes vary.
| Group | Typical starters |
|---|---|
| Quarterback | 1 |
| Running back | 1 |
| Wide receiver | 3 |
| Tight end | 1 |
| Offensive line | 5 |
| Defensive line | 4 |
| Linebacker | 3 |
| Defensive back | 4 |
Special teams add a kicker, a punter, a long snapper, and returners. Many fans forget these spots, yet field position depends on them.
Returning production, a simple formula
Returning production tells you how much of last year's output is still on the team. Here is the formula.
returning share = yards from returning players / total team yards
Suppose a team gained 4,700 yards last year. Players still on the roster produced 2,900 of them. The share is 2,900 divided by 4,700, or 61.7 percent.
Now use that share to adjust a stat. I blend last year's number with the league average.
adjusted stat = share x last year + (1 - share) x league average
Say last year's yards per play was 6.8 and the league average was 5.8. The adjusted figure is 0.617 x 6.8 plus 0.383 x 5.8. That comes to about 6.4. This is my own rule of thumb and not a published model. It is still better than trusting 6.8 with a new lineup.
For a refresher on the stat itself, read my yards per play guide.
Net portal impact
Count who left and who arrived. Then look at who actually played. A team that loses three offensive line starters and adds two transfers who started elsewhere still has one open spot. Counting heads is only the first step, because snaps tell the real story.
Here is my opinion, and it is not data. Quarterback and offensive line changes move my numbers the most. I trust a new skill player far more than a new line.
How transfers affect each position group
Not every new starter moves a team by the same amount. This table shows what I look at first. The ranking is my opinion, not data.
| Group | What a new starter changes | What I check |
|---|---|---|
| Quarterback | Every pass play and many run calls | Yards per attempt at his old school |
| Offensive line | Pass protection and run blocking | How many linemen return together |
| Defensive line | Pressure and run stops | Sacks and tackles for loss per game |
| Skill players | Big plays and third-down targets | Yards per touch |
| Kicker and punter | Field position and close games | Net punt average and field goal rate |
A line works as a unit. Five linemen who played together last year usually beat five strong players who just met. That is why I count returning linemen as a group.
How to track roster changes through the year
- After spring practice. The first depth chart takes shape, and open jobs show up.
- During preseason camp. Position battles get settled, and injuries start to matter.
- In game week. The posted chart and any availability news give the best view of who will play.
- At midseason. Injuries and benchings reshape the lineup, so refresh your numbers.
What to check each week
- Who is listed as the starting quarterback.
- Which starters are out with injuries.
- Which transfers made their first start.
- Which spots show an "or" instead of one name.
- Whether a coach changed an offensive line spot.
How roster news moves a line
Roster news moves fast, and a team's outlook can change in a day. If you see a big shift, check the depth chart first.
My take
I would rather under-credit a team that lost its quarterback and offensive line than over-credit it. My formula gives last year's numbers the benefit of the doubt. A new quarterback behind a new line deserves less weight than the formula shows.
The numbers I ran
I tried the returning production formula at six shares. League average is 5.8 yards per play. The first column assumes a team that beat it by 1.0 last year. The second assumes a 1.6 edge.
| Returning share | Adjusted (1.0 edge) | Adjusted (1.6 edge) |
|---|---|---|
| 40% | 6.20 | 6.44 |
| 50% | 6.30 | 6.60 |
| 60% | 6.40 | 6.76 |
| 70% | 6.50 | 6.92 |
| 80% | 6.60 | 7.08 |
| 90% | 6.70 | 7.24 |
Each 10 points of returning share adds 0.10 yards for the first team and 0.16 for the second. Big edges depend more on who stays.
Common mistakes
- Using last year's stats for a new lineup.
- Counting a commitment as a starter.
- Judging a transfer only by his old team's numbers. His old line, scheme, and opponents shaped those stats.
- Skipping the offensive line, because it rarely shows up in headlines.
Practice problem
A team gained 5,000 yards last year. Players who left produced 1,800 of them. Last year's yards per play was 6.0, and the league average was 5.5. Find the adjusted figure.
Players who stayed produced 3,200 yards, so the share is 64 percent. The adjusted stat is 0.64 x 6.0 plus 0.36 x 5.5. That equals 3.84 plus 1.98, or 5.82.
Where to find reliable roster information
Start with each school's official site and its posted depth chart. Then confirm who actually played in the box score. A roster tells you who could play. The box score tells you who did. My box score guide shows where to look.
Frequently asked questions
What is the transfer portal?
The transfer portal is an NCAA database where players list themselves when they want to move to another school. Coaches can then see them and make contact.
Can a player enter the portal and still stay?
Yes. Some players enter and then return to their own team. A name in the portal is not a done deal.
How many players can a top-tier football team have?
Rosters cap at 105 players. That replaced the old limit of 85 scholarships.
What does two-deep mean?
Two-deep means the starter and the first backup at every position. Coaches use it to show who plays first and who steps in next.
How do I adjust last year's stats for new starters?
Find the share of last year's yards that came from players who returned. Then blend last year's stat with the league average using that share. The returning production section above shows the formula.
The takeaway
Roster news only helps when you tie it to results. Adjust last year's stats, check the depth chart, and then test the new numbers. Run them through the SEC football analysis tool, or read how to project a season record next.
