CORTENHT/FT (half time / full time) combines the half-time and full-time result in one price, giving nine possible outcomes from 1/1 to 2/2. Each price implies a probability of 1 / odds; the nine probabilities add up to more than 100%, and the excess is the margin. A normalised probability is derived from prices; it is not a prediction.
HT/FT (half-time / full-time) describes the result at half-time and at full-time together. The left side of the slash is the half-time result, the right side the full-time result: X/1 means the first half ends level and the home team wins the match.
Nine possible outcomes
Three half-time results (1, X, 2) combined with three full-time results give nine combinations: 1/1, 1/X, 1/2, X/1, X/X, X/2, 2/1, 2/X, 2/2. Exactly one of them always happens, so their probabilities should add up to 100%.
From odds to implied probability
The raw probability implied by decimal odds is 1 / odds. The table below is a synthetic example; it does not belong to a real match.
| Outcome | Odds | Raw probability | Normalised probability |
|---|---|---|---|
| 1/1 | 3.10 | 32.26% | 26.98% |
| X/1 | 4.80 | 20.83% | 17.43% |
| 2/1 | 28.00 | 3.57% | 2.99% |
| 1/X | 15.00 | 6.67% | 5.58% |
| X/X | 5.20 | 19.23% | 16.08% |
| 2/X | 15.00 | 6.67% | 5.58% |
| 1/2 | 34.00 | 2.94% | 2.46% |
| X/2 | 8.50 | 11.76% | 9.84% |
| 2/2 | 6.40 | 15.63% | 13.07% |
Why does the total exceed 100%? The margin
The nine raw probabilities in the example add up to about 119.56%. Everything above 100% is the bookmaker’s cut (the margin, or overround). The simplest way to strip it out is to divide each raw probability by the total: qᵢ = (1/oᵢ) / Σ(1/oⱼ). The last column uses this normalisation and adds up to 100%. Nine-outcome markets usually carry a higher margin than the three-outcome 1X2 market; you can run the same calculation for 1X2 in the probability and margin calculator.
A normalised probability is derived from the market’s prices; it is not a model prediction or a guarantee that something will happen.
Comebacks: 2/1 and 1/2
The 2/1 and 1/2 outcomes, where the team behind at half-time wins the match, are known as comebacks and are priced high. In the example, 1/2 has a normalised probability of 2.46%: roughly one match in 40. Rare outcomes appear only a handful of times in historical data, so claims such as “comebacks are common in this league” swing a lot on small samples. Always ask how many matches a figure comes from; see the sample size guide.
What to watch for
HT/FT prices should be consistent with the half-time and full-time markets: for example, 1/1 + X/1 + 2/1 should come close to the full-time “1” probability (47.39% normalised in the example). Large inconsistencies can come from prices recorded at different times; we explain when a price is recorded in the opening vs closing odds guide.
If you want to look at HT/FT distributions in past matches by league and season, Cortenscore’s archive analyses can help; access requires a membership.
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Published 28 October 2026 · Last updated: 28 October 2026 · Responsible: Cortenscore editorial team · Spotted an error? Report a correction. This page is for statistics education; it is not a prediction or betting advice. Example odds are synthetic.