College Football Playoff 2027 odds: is Ohio State at 13.5¢ value?

The Buckeyes are the most efficient team in the country on paper and are priced identically to a Notre Dame side that every public model rates six points weaker. That is the whole trade: not that 13.5¢ is cheap in isolation, but that the market has flattened a real gap between the two co-favourites. This Deep Dive walks the de-vig math, the bracket path, the case for the market being right, and the four triggers that would kill the read.

Methodology: how the 16% estimate was built

The estimate is a weighted blend of three independent anchors, all dated within the last fortnight, and none of them ours alone.

The first is ESPN’s Football Power Index, which had Ohio State at a 17.0–17.1% national title probability across two mid-August snapshots, on an FPI rating of 28.7 and a projected 10.2 wins. FPI is opponent-adjusted, so it already prices the schedule. It carries 50% of the weight.

The second is a bracket-path model built off Bill Connelly’s final preseason SP+, released August 13, 2026. Converting the SP+ gap between Ohio State and a plausible sequence of playoff opponents into per-game win probabilities — assuming roughly a 16-point standard deviation on college football game margins — and running it through a 12-team bracket with and without a first-round bye returns about 23%. That number is deliberately naive: it ignores in-season rating drift, injury attrition and the selection effect that playoff survivors outperform their August ratings. It carries 20%.

The third is a base rate. Only two of the last 19 preseason Associated Press No. 1 teams have gone on to win the title — USC in 2004 and Alabama in 2017 — a 10.5% strike rate. That sample is drawn almost entirely from the two-team and four-team playoff eras, when a favourite who slipped once was often eliminated outright, so it understates the modern path. It carries 30% as a discipline check on model optimism.

The blend: (0.50 × 17.0) + (0.20 × 23.0) + (0.30 × 10.5) = 16.0%. The obvious caveats: not a single snap of the 2026 season has been played, preseason SP+ leans heavily on returning production and recruiting, and a 2-to-3-point edge on a market this thin is close to noise.

The market, the price and the de-vig

Polymarket’s contract is titled “NCAA Football: 2027 National Champion” and resolves to the winner of the 2026-27 College Football Playoff. The event has traded roughly $79,400 in volume with about $395,000 of resting liquidity, and the Ohio State leg alone accounts for around $5,700 of that volume. That matters: the leg quotes 13¢ bid and 14¢ ask, and a one-cent spread on a 13.5¢ ticket is about 7% of the notional. Prediction-market prices in cents read directly as probabilities, but only after you account for the fact that you buy at the ask.

Sixteen teams carry live prices on the board. Their YES prices sum to 102.7¢, an overround of 2.7 percentage points, which is remarkably tight for a futures market. Removing it proportionally gives the table below.

Sources: Polymarket API snapshot, August 14, 2026, 12:34 UTC; ESPN FPI title probabilities via SportsGrid, August 2026. De-vig method: proportional, across the 16 priced outcomes summing to 102.7¢.

Is Ohio State at 13.5¢ value? On the numbers available on August 14, 2026, marginally — and the margin is thinner than the headline suggests. The YES share quotes a 13¢ bid and a 14¢ ask, so the executable entry is 14¢, not the 13.5¢ midpoint. Across the 16 priced teams, the YES prices sum to 102.7¢, an overround of 2.7 percentage points; stripping that out proportionally puts the market’s true reading of Ohio State at 13.1%. Our own estimate, blended from ESPN’s Football Power Index, a bracket path built off final preseason SP+ and the historical strike rate of preseason No. 1 teams, lands at 16.0%. That is a 2.9-point edge against the de-vigged midpoint and a 2.0-point edge against the price you can actually pay. Real, but comfortably inside the error bars of any model built in August.

“Through 12 games last season, Ohio State was basically untouchable: Day’s Buckeyes survived a cautious slog between first-year starting QBs (Julian Sayin vs. Arch Manning) in a 14-7 win over Texas, then plowed through everyone in their path, winning the next 11 games by an average of 39-8.”

Why Ohio State is the value side of a mispriced pair

The strongest argument for the ticket is not about Ohio State at all. It is about the team sitting at the identical price.

Connelly’s final preseason SP+, published August 13, 2026, separates the board’s top five by real margins: Ohio State 32.7, Oregon 29.2, Notre Dame 26.5, Georgia 26.4 and Indiana 25.8. That is a 6.2-point gap between the two teams Polymarket has priced at exactly 13.5¢. FPI reaches the same conclusion by a different route, giving Ohio State 17.0% and Notre Dame 10.6%. Two public models built on different inputs agree the Buckeyes are the clearly better team; the market has them level.

Sources: ESPN final preseason SP+ ratings, August 13, 2026; Polymarket snapshot, August 14, 2026; ESPN FPI via SportsGrid, August 2026.

There is a defensible reason the market compresses them. Notre Dame plays one of the softest schedules in the country as an independent with no conference championship game to lose, which raises its probability of simply reaching the bracket. Ohio State plays what SP+ projects as the third-hardest schedule in the country. On the “get in” leg, the Irish are genuinely closer than the ratings imply.

But the 12-team format has been confirmed for 2026-27, and inside a fixed bracket, schedule strength stops paying. Once you are one of 12, the only thing that decides three or four neutral-site games is how good you are. Ohio State returns 11 starters from a 12-2 team, including quarterback Julian Sayin — a Heisman finalist as a redshirt freshman who completed 77% of his passes — and Jeremiah Smith, widely rated the best receiver in college football. SP+ rated the Buckeyes first in defence and second in offence. That is the profile that survives a gauntlet.

Is the Ohio State leg better value than the Notre Dame leg at the same price? On every public input available in mid-August, yes, and by a wide margin. SP+ separates them by 6.2 rating points, which over a neutral-site game is worth roughly 40% of a standard deviation of margin. FPI separates them by 6.4 percentage points of title probability. Ohio State is projected first in the country in both systems; Notre Dame is third in one and third in the other. The market’s justification for level pricing — Notre Dame’s soft path to the bracket versus Ohio State’s brutal one — is a real effect, but it applies only to the first leg of a two-leg problem. Getting in is worth nothing on its own. Winning four games against top-12 opposition is the whole contract, and that is where a 6.2-point rating gap compounds rather than cancels.

The case against: why the market may be right

Start with the obvious. Ohio State lost its last two games of 2025 — 13-10 to Indiana in the Big Ten Championship Game, then 24-14 to a No. 10-seeded Miami in the Cotton Bowl quarterfinal, as the No. 2 seed with a bye. A team that looked untouchable for 12 games was beaten twice in three weeks by opponents it was favoured against. Preseason ratings do not carry that information; the market may.

Then the schedule. FPI gives Ohio State only a 9.2% chance of an undefeated regular season and 38.8% to win the Big Ten, with 10.2 projected wins — fourth-best in the country despite the No. 1 rating. The 2026 slate sends the Buckeyes to Texas on September 12, to Iowa, to defending champion Indiana on October 17, to USC and to Nebraska, while hosting Oregon and Michigan. That is four opponents from the Polymarket top eight. SP+ projects it as the third-hardest schedule in the country; Phil Steele’s rankings have it sixth.

“It’s going to force us to get games into the fourth quarter, get comfortable winning games in the fourth quarter. That Texas game is going to be a monster. That Iowa game on the road at Iowa, at Indiana. These environments are going to be really loud.”

The base rate is the sharpest objection. Two of the last 19 preseason AP No. 1 teams have won the title. Being the best team in August has historically been closer to a curse than a coupon, and the reasons are structural: attrition, one bad Saturday, and the fact that ratings compress once real results arrive. Our model already discounts for this, which is why 16% sits well below FPI’s 17.0% and far below the naive SP+ path of 23%.

Not everyone even makes Ohio State the top rating. Covers betting analyst Chris Gregory picked Oregon at a 10% Kalshi probability on August 6, 2026, projecting an 11-1 season with the only loss coming in Columbus.

“Dan Lanning’s Oregon Ducks are going to break through. It’s only a matter of time.”

One cross-venue note cuts both ways. Sportsbooks had Ohio State at a best available +600 (7.00 decimal, 14.29% raw implied) on August 1, 2026, with Notre Dame +700, Texas +750, Indiana and Oregon +800 and Georgia +900. Summing just the 13 listed teams at best available prices already reaches 101.8%, before another hundred-plus teams are added, so a single book’s board carries far more overround and the raw 14.29% overstates what the books think. Kalshi had Ohio State third at 11% on August 6, behind Notre Dame and Texas at 12% apiece. Polymarket has re-rated the Buckeyes upward since — at 14¢, this is no longer a quiet number.

Where this bet breaks

The lean on Ohio State at 13.5¢ rests on assumptions that could fail. It breaks if any of these fire:

• Julian Sayin or Jeremiah Smith misses time. The 16% estimate leans on offensive continuity — a returning Heisman-finalist quarterback at 77% completions throwing to the best receiver in the sport. SP+ and FPI both weight returning production heavily; a season-ending injury to either invalidates the input the whole rating is built on, and the price would not fall as far as the true probability does.
• The ticket trades through 16¢. The edge is 2 to 3 points wide at the current ask. At 16¢ the market has met our estimate and there is nothing left; above it the position is upside down. A win at Texas on September 12 could move the leg several cents in a session on a market this thin.
• Ohio State falls out of the top four by December. Byes go to the four highest-ranked teams regardless of conference championships. Losing the bye adds a fourth game to the path and pushes a bye team into the quarterfinal instead of a first-round survivor. In the bracket model, that swing is worth roughly 10 points of conditional win probability — enough to take the estimate from 16% to under 13% on its own.
• FPI drops below 14% while the price holds. Half the estimate is borrowed from one model. If FPI re-rates Ohio State down after September results and the market does not follow, the apparent edge is a stale model artefact rather than a mispricing, and the honest response is to mark it to zero.

What to watch between now and January 25

The Associated Press preseason Top 25 lands at noon Eastern on August 17, 2026 — the first hard sentiment marker and a historic price mover on futures boards. Ohio State opens against Ball State on September 5.

The real catalyst is September 12 in Austin. Ohio State won the 2025 meeting 14-7 in a first-year-quarterback slog; this is the return leg of the home-and-home and the biggest swing game on either schedule. The loser of a game between the No. 1 and No. 6 SP+ teams still has a live playoff case, so an overreaction in either direction is where the next tradable number appears.

After that: the October 17 trip to Indiana, a rematch of the Big Ten title game the Buckeyes lost, and the November home date with Michigan. Byes are decided by the final committee ranking in early December, and the top-four cut line is the seeding threshold that matters more than the conference championship itself. The final is at Allegiant Stadium in Las Vegas on Monday, January 25, 2027, on ESPN with an ABC simulcast for the first time in playoff history.

FAQ

Related reading on this site: our breakdown of Super Bowl LXI odds and whether the Rams at 16¢ on Kalshi are value, the same treatment applied to Champions League 2027 odds and PSG at 14.5¢, a cross-venue comparison in Kalshi versus Polymarket World Cup odds, and the industry backdrop in FanDuel and DraftKings quitting the AGA over prediction markets.

This article is informational analysis only and is not betting or financial advice. Odds and prediction-market prices move constantly; every price quoted is a timestamped snapshot, not a live line. There is no such thing as a guaranteed bet — past results and model estimates do not guarantee outcomes. Do your own research.

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