Arizona Cardinals vs San Francisco 49ers
Updated · market price
Sunday, September 27, 2026 · Levi's Stadium, Santa Clara, CA
Quick Answer
As of September 15, 2026, Kalshi implies 80% for the 49ers in Arizona Cardinals vs San Francisco 49ers, NFL Week 3 2026, while our model has the 49ers by 7.5 (65% to win) — a 14.4pp gap. A gap past our 12pp ceiling against a liquid price is more likely our error than the market's — no call.
Kickoff board
Week 3 · 2026-09-151 actionable market of 1 priced — largest edge 14.4pp on Cardinals moneyline.
Edge is model probability minus the market's implied probability, in percentage points. One published number per market: where our sources disagreed we publish the most conservative defensible figure, and where they disagreed by more than 15 points the row is a conflict and carries no stake. ¼ Kelly is the share of a bankroll quarter-Kelly would put on the row at the published price — click it to size against your own bankroll on our Kelly calculator, or call kelly_size from our MCP server inside your own agent.
ARI
-3.7
SF
+1.0
Our number and the market agree on this one — the gaps are elsewhere on the board. Get the full Week 3 card free, every game priced against our model.
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Cardinals
35%
model win prob
49ers
65%
model win prob
Run this matchup yourself → Full PWR board for all 32 → Player prop gaps for this game →
28%
Madden 27
72%
Madden 27
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The Ladder — Cardinals at 49ers
All ladders →Our margin distribution against every Kalshi spread strike listed for this game. A single line says we lean one way; the ladder says whether that is about the middle of the distribution or its tail.
Our number is published at the called strike only; the market curves are complete.
| Rung | Market | Model | Gap | |
|---|---|---|---|---|
| 49ers −0.5 | — | 🔒 | — | not listed |
| 49ers −1.5 | — | 🔒 | — | not listed |
| 49ers −2.5 | — | 🔒 | — | not listed |
| 49ers −3.5 | — | 🔒 | — | not listed |
| 49ers −4.5 | — | 🔒 | — | not listed |
| 49ers −6.5 | — | 🔒 | — | not listed |
| 49ers −7.5 | — | 🔒 | — | not listed |
| 49ers −9.5 | — | 🔒 | — | not listed |
| 49ers −10.5 | — | 🔒 | — | not listed |
| 49ers −13.5 | — | outside range | — | not listed |
| 49ers −14.5 | — | outside range | — | not listed |
Rung-by-rung numbers are a Pro feature. Unlock Pro →
Gold is our distribution, parchment is the Kalshi contract at each strike; the band between them is green where our probability is higher and purple where it is lower. We publish our number only where we have measured it to be calibrated, between 30% and 70%; rungs outside that range show the market only. A contract pays $1 if it settles YES, so a price in cents is an implied probability. Prediction markets carry risk; contracts can settle at $0.
Power-rating comparison
Season outlook
10,000 simulated seasons on our preseason power ratings — real NFL tiebreakers, real 2026 schedule, no injuries or market prices. The season sim fits its own home-field (2.0 points, from played games); the game model above uses +2.5. How it works →
Why the model has the 49ers by 7.5
The model does not think this one is close. The 49ers rate 14th of 32 at +1.0, the Cardinals 30th at -3.7, and once home field is applied the line lands on the 49ers by 7.5 — 65% to win. That is the 16th-widest gap among the 16 games on the Week 3 board. A preseason rating spread this size is not a promise: it says nothing about turnovers, health, or a defense that shows up different than last year. What it does say is that the Cardinals need the price to be wrong, not the matchup.
The sharpest unit gap in the game runs one way: the 49ers offense grades +3.1 (6th of 32) against a Cardinals defense at -2.9 (30th) — 6.1 points of separation on our scale, and the single biggest reason the line sits where it does. Going the other direction, the Cardinals offense (-0.7, 22nd) meets the 49ers defense (-3.0, 31st), a 2.3-point gap. Special teams adds to it: the 49ers grade +0.9, 4th in the league, against -0.1 (30th) on the other side — close to a point of hidden margin.
Zoom out to the full season and the model projects the 49ers at 8.9 wins (favored in 8 of 17) and the Cardinals at 6.5 (favored in 3) — 2.4 wins apart across the year. By win probability this is the 16th-hardest game on the 49ers' schedule and the 4th-hardest on the Cardinals'.
On the standings side, NFC West games are the ones that decide the tiebreakers. Head-to-head record is the first tiebreaker between two teams in the same division, and division record is the next — so the value of this result is not just the win column. They meet again in Week 18, which makes a sweep the outcome with real leverage on the NFC West race.
Recent history, for context only: 48 regular-season meetings since 2002, 26-22 in the 49ers' favour. They last met in 2025: 49ers won 41-22 in November. Over their last 4 meetings the 49ers are 2-2. It is not an input to the line — rosters turn over faster than series records do.
Does the model earn this number? In 448 of the 3266 walk-forward games it has been graded on (2013-2024, no market line used), it landed in the 65-70% range. Those favourites went 68%. The 65% on the 49ers here sits in that same band, and the history backs it.
Kalshi's KXNFLGAME-26SEP27ARISF contract implies 80% for the 49ers against our 65% — a 14.4-point gap. That clears our 5-point threshold, which flags the 49ers as the value side.
Full division picture on the NFC West hub.
Prediction markets are not sportsbooks — you trade a contract that settles at $1 or $0, not a wager against a house line. Informational only; trade responsibly.
Cardinals vs 49ers on Kalshi
- Kalshi event
- KXNFLGAME-26SEP27ARISF
- Market-implied (49ers)
- 80c · 80%
- Our model (49ers)
- 65%
- Model vs market
- -14.4pp
Kalshi lists this game as KXNFLGAME-26SEP27ARISF. A contract price in cents is already a probability, so 80c on the 49ers is an implied 80% — no odds conversion needed. Our model has 65%, a 14.4pp gap. Contracts settle at $1 or $0 and you can exit before kickoff.
Where Cardinals vs 49ers trades
Each venue’s own price where we have one; Robinhood and Coinbase resell the Kalshi contract. Home-side price shown.
| Venue | 49ers | Trade |
|---|---|---|
| Kalshi | 80% 80c | Trade on Kalshi → |
| Novig | not yet listed on Novig — $25 credit on a $10 deposit through our link | Sign-up offer → |
| Polymarket | no captured price for this game — international book | Sign-up offer → |
| Robinhoodsame Kalshi contract | 80% 80c | Open Robinhood → |
| Coinbasesame Kalshi contract | 80% 80c | Open Coinbase → |
| DraftKings Predictions | price not available — sign-up offer → | Sign-up offer → |
| FanDuel Predicts | price not available — sign-up offer → | Sign-up offer → |
| Fanatics Markets | price not available — sign-up offer → | Sign-up offer → |
A price under a venue name is that venue’s own; Robinhood and Coinbase list the same Kalshi contract. DraftKings Predictions, FanDuel Predicts and Fanatics Markets run on exchanges we have no price feed for, so they carry an offer and no number. We earn a referral credit or commission when you sign up through these links; it never changes the price or the model. Disclosure.
Cardinals vs 49ers — frequently asked
Who is favored in Cardinals vs 49ers in Week 3?
Our power-rating model picks the 49ers by 7.5 points, a 65% win probability over the Cardinals, for a projected score of 49ers 30, Cardinals 23 on a ratings-implied 52.4-point total. Kalshi's KXNFLGAME-26SEP27ARISF market implies 80% for the 49ers — a 14.4pp gap versus the model.
What would it take for the Cardinals to win?
The 7.5-point line comes from a 4.7-point rating gap, and a single-game margin has roughly a 14.4-point standard deviation around it — which is why the Cardinals still project at 35% rather than zero. Their best structural path is the Cardinals defense (-2.9, 30th of 32) holding up. Ratings do not price injuries or turnover luck, which is where most upsets actually come from.
How do you take a position on Cardinals vs 49ers?
The contract is KXNFLGAME-26SEP27ARISF on Kalshi, a CFTC-regulated exchange open to traders in all 50 states. 49ers YES is quoted around 80c against our 65% model number. There is no point spread — you buy a yes or no contract on a team and it settles at $1 or $0.
When and where do the 49ers host the Cardinals?
Arizona Cardinals visit the San Francisco 49ers on Sunday, September 27, 2026 — a Sunday game in NFL Week 3, at Levi's Stadium, Santa Clara, CA.
What does the model project for the 49ers and Cardinals this season?
Across all 17 games the model projects the 49ers at 8.9 wins (favored in 8) and the Cardinals at 6.5 (favored in 3). This game ranks 16th-hardest on the 49ers' schedule and 4th-hardest on the Cardinals', by model win probability.
What are the Kalshi odds for Cardinals vs 49ers?
Kalshi prices this game as event KXNFLGAME-26SEP27ARISF. The 49ers YES contract sits around 80c, which is an implied 80% — against our model's 65%. That is a 14.4pp gap, and a contract price in cents is already a probability, so no odds conversion is needed.
Can you trade Cardinals vs 49ers on Kalshi?
Yes — as an event contract, not a point spread. Kalshi is a CFTC-regulated exchange open to traders in all 50 states, and the Week 3 game market is KXNFLGAME-26SEP27ARISF. You buy a YES or NO contract on a team between 1c and 99c and it settles at $1 or $0, so the price you pay is the break-even probability. There is no vig baked into a line, and you can exit before kickoff at whatever the market is then paying.
How often does the model win when it is 65% on a team like the 49ers?
68% of the time. Over 3266 walk-forward games from 2013-2024 — trained only on prior seasons, no market line as an input — the model put a team in the 65-70% range 448 times, and those teams won 68% of them. The 49ers at 65% over the Cardinals sit in that band, off a 7.5-point model line. Straight-up across all 3266 graded games the model picked winners at 59.6%, with a Brier score of 0.236 against 0.25 for a coin flip.
Why read this pick instead of a preview from a big sports outlet?
Two things a bigger outlet does not do. The number is posted before kickoff against the live Kalshi price, so you can see where the model and the market disagree while it still matters. And the page keeps the call after the game — result, hit or miss, closing-line value — so the record is public. Every graded call is at predictionmarketspicks.com/track-record.
Is Cardinals moneyline worth a position?
Our model puts it at 35% against a market price implying 21%, an edge of +14.4 points. Model 35% vs market 20% on ARI. We rate it attack, sized at 4.5% of bankroll at quarter Kelly.
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The rematch
They run it back in Week 18. Division games are the pairings the model gets two swings at, and the second line usually moves off what the first one showed. Cardinals–49ers, Week 18 →
More Week 3 matchups
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