2 July 2025

31 thoughts on “Calculation of Odds: Probability and Deviation

  1. Hello guys! I am looking for the acceptible methods to calculate probability chances “1 x 2” on football matches. I read a lot of articles, but there are no useful information that can help me. I started to investigate probability theory myself and I freezed after some calculations.
    Let imagine we have match between Chelsea and Liverpool. I understand how calculate probabilitly for each team. I took last ten Chelsea’s home matches and last ten Liverpool’s away matches. After simple calculations(win/10; draw/10; lose/10) I received:
    P(Chelsea win at home) = 0,55;
    P(Chelsea draw at home)=0,35;
    P(Chelsea lose at home) = 0,10;

    P(Liverpool win away) = 0,20;
    P(Liverpool draw away)=0,55;
    P(Liverpool lose away) = 0,25;

    But I could now understand how to use this calculated data to predict match Chelsea – Liverpool. I tries to apply sum and multiplication theorems, but there could be incredible result, for exmaple over 1. I definetly understand that this calculation would be very approximatly and that there are a lot of parameters that affect on football result, but I think that it could be useful to predict match. Thank you for any help!

  2. hi soccerwidow

    i m getting into sportsbetting,i figured out that i might bet on soccer becouse its the sport that i know more than the others,so far so good. when i started to surch on the internet information for betting i get a lot,and i mean a looot confused,there is no precise information, everyone says diffrent shit and i m far away from descovering hot all this works
    i found your blog and strarting to read it,you talk about the analysis of the match,analysis for the odds and other things,is this the way professional sports bettors bet? for me to bet do i need this tools? if i have to,can i find this tings on the internet and learn them? when you find a site with odds,isn t it the same as you do you r own odds,saves so much time..so,how can i learn all this things on internet? and what are the really main thing i have to learn in order for me to bet? please help me cuz i m a lot confused and i see you are truly an expert in this so thanks if you answer my questions

  3. The minimum odds are computed as follows:
    Home win: 2.08 calculated odds multiplied by (1 minus ‘error’ 4.14%) = 1.99

    The maximum odds are computed as follows:
    Home win: 2.08 calculated odds multiplied by (1 plus ‘error’ 4.14%) = 2.17

    am i just being really stupid beacuse i cant seem to get these same answers when i do this sum??

    many thank!
    scott

    1. Hi Scott, here’s the calculation a little bit more in detail. Hope it helps.

      2.08 calculated odds multiplied by (1 minus ‘error’ 4.14%) = 1.99
      1 minus ‘error’ 4.14% >> 1 – 0.0414 = 0.9586
      2.08 × 0.9586 = 1.9939 (rounded: 1.99)

      2.08 calculated odds multiplied by (1 plus ‘error’ 4.14%) = 2.17
      1 plus ‘error’ 4.14% >> 1 + 0.0414 = 1.0414
      2.08 × 1.0414 = 2.1661 (rounded: 2.17)

      Best wishes,
      Soccerwidow

  4. Hey,

    I just came across an app that offers the chance to win 50,000 to correctly predict the odds of two entire leagues.

    As an example it says if I can correctly predict 100% premier league results this weekend (10 games) + (10 games of the Spanish League)

    What is the average chance per game or the chance winning the 50,000?

    1. Do you have to predict the expected odds (antepost), or predict the actual results which will be played? These are two completely different things.

    1. Hi erez, I don’t understand your question. Sorry!

      Generally speaking, home favourites are mainly overpriced, meaning that bookmakers price them at a higher chance to win than their true chances are. For example, odds of 1.75 stand for a 57.1% chance to win, whilst odds of 2.0 for a 50% chance. If bookmakers offer 1.75 odds for a team which should be actually priced at 2.0 then they are ensuring that they have the mathematical advantage on their side.

      You may be interested into our HDA Simulationtables. Just have a look.

  5. Hello
    I have been using some data like
    1. Average Home Team goals,
    2. Avereage Home team conceeds
    3. Average scored by Away Team
    4. Average Conceedes by away Team

    I also use:
    1. Attacking rating
    2. Defensive Rating

    How can I combine these statistics to get me an idea of expected result.

    I am aware that per chance things can change

    Erny

    1. Hi Erny,

      I’ll have to think about that and add your question to the 1×2 course I have been planning to write for a long while, especially the attacking/ defensive rating… No idea, to be honest, because I don’t even know where I could get enough data from to analyse it properly.

      Generally speaking, from a statistical perspective, football matches do not occur frequently enough. For example, looking at a single league such as the German Bundesliga with only 306 matches per season, a relevant sample size is never going to be large.

      The plain truth is that any football league is simply not large enough to generate a significant amount of completed match statistics per season. This means that the standard deviation (margin of error) is always going to be relatively large…. and attacking/ defensive rating… it’s only the last few matches, isn’t it?

      I probably wouldn’t burn my fingers with it.

    1. Hi Mathew,

      Can you please be a little more specific – what exactly is it you are trying to figure out?

Leave a Reply to Soccerwidow Cancel reply

Your email address will not be published. Required fields are marked *