Premiership · Saturday, 5 September 2026 · 20:00. Our rating makes this 53% to go over 2.5 goals, so our lean is over. The Premiership average is 52%.
Open this match in the app →| Market | Yes | No | Our call |
|---|---|---|---|
| Over 2.5 goals | 53% | 47% | Over |
| Over 3.5 goals | 30% | 70% | no pick |
| Both teams to score | 49% | 51% | No |
The result model puts ST Mirren at 17%, the draw at 21% and Celtic at 62%, from expected goals of 0.94 and 2.
| Market | Price | Implied | Our rating | Edge |
|---|---|---|---|---|
| Over 2.5 goals | 1.57 | 60% | 53% | -7% |
| Under 2.5 goals | 2.38 | 40% | 47% | +7% |
| Both teams to score | 1.80 | 52% | 49% | -3% |
Implied percentages have the bookmaker's margin removed, so they add to 100 and can be compared with our rating directly. Edge is simply the gap between the two. A positive edge means our model thinks the outcome is likelier than the price suggests — it is not a tip, and a high probability with a negative edge is a poor bet however safe it looks. Prices are a pre-match snapshot from a single bookmaker and move constantly.
Match odds: ST Mirren 8.00, draw 4.50, Celtic 1.36.
The league sets the starting point. Premiership has produced over 2.5 goals in 52% of its matches, and that is where a team with no record of its own would sit.
Each side's own record. ST Mirren have 1 in 3 this season (1 of 2 at home), Celtic 2 in 3 (1 of 1 away). Those records are pulled toward the league rate with the weight of about 32 matches — enough that two or three unusual games cannot swing a rating — giving 51% and 55%.
Last season still counts, briefly. With 3 and 3 games played this season, last season's rates are still blended in and fade out entirely by game 14 — the point at which our testing showed they stop adding accuracy. That moves the two figures to 34% and 66%.
The mix. Weighted 40% home side, 40% away side and 20% league — the split that beat every alternative across 30,582 matches of testing — that gives 50%.
Head to head. These sides have met 11 times in three years, producing over 2.5 goals in 64%. That nudges the number 10% of the way toward the head-to-head pattern — deliberately small, because fixtures change more than reputations do — landing on 52%.
Goal expectation. Separately a Poisson model built from attack and defence strength — using real expected-goals data where the league has it — puts this match at 56%, from expected goals of 0.94 for ST Mirren and 2 for Celtic. Folding in 30% of that view gives 53%.
This breakdown is generated from the same inputs the rating uses, so it cannot describe a calculation we did not perform. The full model is set out in the methodology.
More: ST Mirren season stats · Celtic season stats · Premiership table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.