Stake, Yield, Return on Investment (ROI), Profitability – Definitions and Formulas


The relation of profit/loss to the money spent. In other words, profitability is an index for measuring financial success (operational profit) in relation to the costs of running the business.

Profitability is THE key indicator that makes betting success measurable and controllable.

We reiterate: Measuring OPERATIONAL Profit!

Profitability measures success connected to the operation (running costs) of the business (not the start-up capital, and also not the turnover of all stakes).

Stakes are strictly speaking just short-term deposit payments which are returned to the bettor should his bet win. Investment (start-up capital) can be anything – some people may prefer a higher bank than others. However, profitability is the same for all, and therefore a much stronger success indicator than any ROI or yield calculations.

Again, in an ideal world, one would factor in the costs of power, heating and light; apply an hourly rate to the time spend in all aspects of the venture; even the food you eat at your work station.

However, to keep it simple, we only factor in the amount of stakes lost [the money spent operating your betting venture].

Profitability Formula:

Profitability Formula

In contrast to the yield, where the turnover of all bets counts, or to the return on investment, where the starting capital counts, profitability is all about the truly invested money (money lost or spent running the betting business).

It is, therefore, the most important and realistic index for sports bettors to quantify the overall financial reward they receive from their betting ventures.


Back to our example: Five of the 38 bets lost. The sum of all money lost, ∑ ML, therefore is 5 x 20 unit stakes per bet = 100 units lost. If you remember, bank growth was 65 units.

Profitability Formula Example

Profitability in this example is 65%

Understanding the Terms: Yield, ROI, Profitability

We sincerely hope that your understanding of the three different indexes, yield, return on investment, and profitability is now crystal clear.

Summary of the Exercise

Our bettor placed 38 bets with stakes of 20 units each. The total amount staked [Capital Employed] was 760 units (38 x 20). 33 of the bets won and 5 of the bets lost; the net result [Profit] was a bank growth of 65 units.

The starting bank [Investment] was 200 units. The sum of all money lost [Running Costs], ∑ ML, was 100 units.

By the way, the betting odds although not mentioned anywhere were 1.25. Otherwise the good hit rate (33 out of 38 bets) would not have been achievable.

The Yield in this example: 8.55%.
The ROI in this example: 32.5%.
The Profitability in this example: 65%.

The betting odds were very small: 1.25 and therefore the turnover to win 65 units pretty high which led to a small yield: 8.55%, but 65.0% profitability!

5 of 38 bets lost, 33 bets won. Hit rate: 86.8%

Can you see that there is a connection between hit rate, odds, yield and profitability?

Measuring your betting success is absolutely essential. You should always be in a position to know whether all the time, effort, and money you have spent is actually worthwhile.

Let’s do another Exercise

Our betting enthusiast starts with an initial bank of 850 units and places 50 bets with stakes of 10 each at average odds of 3.33.

17 bets win, 33 bets lose.

  • What is his hit rate?
  • What is the yield, return on investment and profitability in this example?
  • Is this a ‘riskier’ strategy than the earlier example?
  • Can you judge the risk of a strategy by looking at the yield, ROI and profitability numbers? What is the connection?

Try to work out the answers yourself before downloading them for free below. You’ll also find more exercises to test your newly learned skills!

Practice, Practice, Practice!
Yield, ROI (Return on Investment) and Profitability

>>> exercises & solutions <<<

Just click on the button above and click on “Proceed to checkout” button in the new tab, then enter your name and e-mail address. Our automatic service will then deliver the file to you via e-mail, free of charge. The size of the PDF file is 230KB.

If gambling is a full-time job for you then weigh up the results against the salaries of other jobs you are qualified for or have a chance of securing. If it’s a hobby or part-time job, again compare the final income with what you could have earned elsewhere in the time that you’ve spent.

As always, thanks for reading! Feedback and comments are always welcome, as are shares, loves and likes in social networks! 🙂

If you have enjoyed this article then why not visit What is a Bet? What are Odds? What is a Stake?, another informative piece containing vital ‘need to know’ definitions, including how to calculate mathematical advantage.

learn to think like a bookmaker!
understand bookmaker mathematics

Last Update: 16 June 2017

Categories:Betting Terminology Odds Calculation

14 Responses to “Stake, Yield, Return on Investment (ROI), Profitability – Definitions and Formulas”

  1. Hugo
    13 March 2019 at 10:55 pm #

    Remains one question.
    If you are just starting and in 10 bets you hit all 10 you can’t devide by 0. So how do you calculate your profitability in this case? Of course you just need to loose one to be able to devide and that will happen sooner or later but till then how do you calculate it?

    • Soccerwidow
      14 March 2019 at 11:12 am #

      Hi Hugo,

      this is a very theoretical question… if you can’t divide by 0 then divide by 0.000001 😉

  2. Dalan Quaice
    19 May 2018 at 6:58 am #

    Thanks soccer window for a great article on yields over betting exchanges. Just to understand some concepts.

    Suppose that these are the odds for 10 bets with a stake of 100 unit each with strike rate of 7 and lost of 3.

    1.23, 1.44, 1.55, 1.34, 1.47, 1.60, 1.28, 1.50, 1.36, 1.27

    Do we take average like above is 1.404 and work out money won as:

    MW = (10 * 1.404 * 100). – (7 * 100) = 704

    ML = (3 * 100) = 300

    PL = 704 – 300 = 404

    Yield = 404/10 = 40.4%

    Or do we Sum all odds with their stake? Example

    MW = (1.23*100) + (1.44*100) +(1.55*100)+( 134*100)+( 1.47*100)+(1.60*100)+( 1.28*100)+( 1.50*)+( 1.36*100)+(1.27 *100) = 1404

    • Soccerwidow
      19 May 2018 at 11:46 am #

      Hi Dalan,

      both work…

      Your first calculation: Yield = 40.4%

      Your second calculation… a little bit continued..

      1,404 / 1000 (total staked) = 1.404
      1.404 minus 1 = 0.404 = 40.4 % Yield

  3. Audiendi
    31 March 2018 at 10:40 am #

    Hi Soccerwidow,

    Sorry as this will sound a very silly question. For record-keeping purposes, I’m a bit sure how to proceed on this.

    If you’re using betting exchange, should you factor in the commission fee into the Money Won calculation?

    E.g. I think Betfair take 5% commission.

    Just using the unaltered yield formula. Let’s say one were to place 40 bets with stakes of 100 units each and with average market odds of 1.50. Let’s suppose that 32 bets hit, and 8 bets miss (although I fear such a great yield may be wishful thinking).

    Using the theory, it should look like

    Money Won= (32 * 100 * 1.50) – (32 * 100)
    = 4800 – 3200

    Money Lost= 8 * 100

    So PL = 800

    And Money Stake

    So that’s a total money staked = 4000.

    Yield = PL/MS

    But if we include a commission fee of 95%, Money Won should surely be:

    MW= (((32 * 100 * 1.50) – (32 * 100)) * 0.95)

    should it not?

    I’m just wondering when most people talk of Money Won and Yield, are they taking out the commission fee? It gives us a difference in yield of 18% compared to 20%

    Sorry for such a long and dumb question.

    Kind regards,


    • Soccerwidow
      31 March 2018 at 11:28 am #

      Hi Audiendi,

      yes, you have to factor in the 5% commission fee of Betfair; Germans have to factor in the gambling tax, etc. etc.

      You’ve calculated right and I’m going to repeat your example, including the BF commission, for the sake of other readers:
      40 bets with stakes of 100 units each, average market odds of 1.50; let’s suppose that 32 bets hit, and 8 bets miss

      Money Won= (32 * 100 * 1.50) – (32 * 100)
      = 4,800 – 3,200
      =1,600 – Commission 5%: 80
      = 1,520

      Money Lost= 8 * 100

      PL = 1,520 – 800 = 720

      Total money staked = 4000

      Yield = PL/MS

      I’ll write an article on that topic one day but currently I’m incredibly busy getting the German Over/Under course finished and in print.

      Have a great Easter and help us to spread the word that we currently have an Easter sales running!

      Thank you,

      • Audiendi
        1 April 2018 at 7:30 am #

        Cheers Elena,

        Happy Easter to you and the family.

        Kind regards,


  4. Audiendi
    21 November 2017 at 9:50 am #

    Hey Guys,

    Do you mean initially the bank was 200 units (perhaps 10 bets of 20 units were initially placed?). The bettor (presumably) collected profits from those first 10 bets. The bettor then made more bets so from the winnings so that, in total 760 units ended up being staked (a total of 38 bets of 20 units)?

    I just couldn’t quite follow 760 units were staked (38 bets of 20 units) yet how can there be a starting bank of 200 units?

    Kind regards,


    • Soccerwidow
      22 November 2017 at 8:17 am #

      Hi Audiendi,

      the starting bank of 200 units is an assumption based on The Science of Calculating Winning and Losing Streaks.

      Further, this example is based on a low risk strategy (38 bets in total, 33 win: 86.8% hit rate; odds: 1.25) and, the example is based on the assumption that the bettor doesn’t place all 38 bets at the same time. Should that be the case then, of course, 200 units’ starting bank wouldn’t be enough.

      So, say… starting bank 200 units… placing 10 bets in total (20 units each)… after these 10 bets your bank will be (depending on winning/losing) somewhere in the region of 140 units (if you were very unlucky, and 3 bets lost in the first betting round) up to 250 units (if all bets won). Then you can turn-over your bank again… and again… and again… That is why you get different numbers for turnover (Yield) and starting bank (ROI).

  5. JT
    12 July 2017 at 10:26 pm #

    Wrong. You have ROI and yield backwards. ROI is calculated as profit / total units wagered.

    • Soccerwidow
      13 July 2017 at 7:07 am #

      Hi JT,

      I don’t have it wrong. The explained definitions are definitions from the financial world applied to sports betting. Look up Wiki, Investopedia, and so on… not forums!

  6. John
    27 April 2017 at 7:07 pm #

    Hi! Do you have any plans to release any more courses?

    • Right Winger
      28 April 2017 at 11:08 pm #

      Hello John,

      There is a 1×2 course in the pipeline, but I’m afraid I cannot be specific about the time scale for its release.

      Apologies for the uncertainty.

  7. Amy
    2 February 2016 at 11:13 pm #

    What a great article! Thanks to you guys I’m currently taking a statistics course to learn more about how this all works. Can’t wait for your new value calculator to come out!

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