Published: June 15, 2026
Table of Contents
Value is about comparing your assessment with the market’s. It is simple in theory and difficult in practice, so a disciplined routine helps. This article lays out the routine step by step, explains the arithmetic with examples and points out the mistakes that make apparent value disappear.
Estimate Before You Look
Write down your probability for each outcome before seeing the odds. Otherwise the market’s view will quietly shape your own. Use percentages that add up to 100 and keep a note of the main reasons.
If you cannot give a number, you do not yet have a view.
Convert Odds
Divide one by the decimal odds to get the implied probability: 2.00 gives 50 percent, 3.50 gives about 29 percent. Remember that implied probabilities across a market add up to more than 100 percent because of the margin. For a three-way market, totals of 104 to 108 percent are common.
Divide each by the total to remove the margin and obtain a fairer picture.
Investigate the Gap
A large difference between your view and the price is a question, not a conclusion. Look for news you missed or errors in your reasoning. Check how the price moved over the day, since a sharp move often follows team news.
Typical Explanations
A late injury, a rotation signal, a tactical change or simply an over-optimistic estimate are the usual reasons.
Review With Honesty
Record estimates and outcomes. Over a large sample you can see whether your numbers are well calibrated. If your 40 percent events happen 40 percent of the time, you are doing well; if they happen 30 percent of the time, you are overconfident.
A Worked Example
You estimate a draw at 31 percent, and the price implies 26 percent after removing the margin. The gap is five points, but your sample is thin and the margin explains part of it. The sensible conclusion is that you have probably found nothing.
Perspective
Predictions are opinions and should be used responsibly and within the law.
Frequently Asked Questions
Why estimate before checking odds?
To avoid being anchored.
How do I convert odds?
Divide one by the decimal odds.
What do I do with a gap?
Investigate before concluding.
How do I know if I am accurate?
Review a large sample.
Are predictions certain?
No.
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