Professional Betting Advice and Strategy from cdsystems
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Quick formulae for prices and percentage chances
To convert a fractional price into a percentage chance
(2nd part of price/Total of both halves of price) x 100 = % chance
Worked example: 6/4
4/10 x 100 = 40%
To convert a decimal price into a percentage chance
(1/decimal price) x 100 = % chance
Worked example: 2.50
1/2.50 x 100 = 40%
To convert a percentage chance into a decimal price
100/percentage chance = Decimal price
Worked example: 40%
100/40 = 2.50
To convert a percentage chance into a fractional price
(100/percentage chance) -1 = Fractional price (odds/1)
(100/40) -1 = 1.50 (or 1.50/1)
Balance your bets and lays with this conversion chart
Each line is designed to break even to a total outlay of £100