Firstly we have the fractional to decimal odds calculator, this is self-explanatory and can be used in both directions.
Advanced football calculator
This Calculator is slightly more complicated but have a play around with it and you should get to grips with it fairly quickly. If you would like to know more about spread betting on sports you can check out my spread betting guide here.
Matched betting calculator(s)
One of the most used betting tools in matched betting is the simple matched betting calculator. If you are a part time-matched bettor I suggest using the free service from profit rush.
If however you are serious and want to make a second income I suggest you sign up for a free account with Profit Accumulator
General bet Calculator
If you simply need to work out winnings or potential winnings from a bet I suggest using https://www.free-bet-calculator.co.uk/, Thier bet calculator is the most comprehensive I have found to date.