When you bet internationally, sometimes, you’ll want to convert some types of odds to others. Perhaps, so that you can compare odds from different bookies or so that you can simply have the odds in a format you are more comfortable with.
Moneyline to Decimal Odds
To convert American moneylines to European decimal style odds there are two formulae depending whether the number has a positive+ sign or a negative – in front of it.
If the money line odds are positive, then divide the figure by 100 and add 1.
For example to convert a moneyline of +300:

300 / 100 = 3

Add 1 and then you will find the number 4. This is the decimal odds.
In other words, if you bet $10, your final payout will be $40 (with a profit of $30).
If, on the other hand, the moneyline is negative, for example, 200, then we remove the negative sign, divide 100 by it and add one.
For example, if the moneyline is 200, we first remove the – sign. We take 100 and we divide it by the moneyline odds, in this case 200 and we add 1. I.e. 100/200+1=1.5. In which case, if we bet $10, we would receive a payout of $15, for a total profit of $5.
Decimal to Moneyline
Where we want to convert decimal odds to moneyline odds then we reverse the process.
For example, if a bookie is showing odds of 4.0, we take this figure subtract 1 and multiply by 100. So, (4.0 – 1) x 100 = 300. The moneyline is therefore +300, that is if we bet $100, we will receive $300 profit (or a total payout of $400).
If the decimal odds are less than two, say 1.4, then we subtract 1, divide 100 by the resulting number and add a negative sign. So, 100/ (1.4 – 1.0) x 1 will give us a moneyline of 250. In other words we need to bet and risk $250 for a possible profit of $100 (and a $350 payout from the bookie)
What could be simpler!