Decimal, fractional and American odds are different ways of expressing the same market price. The calculator converts the entered price to decimal odds first, then derives the other formats, raw implied probability, profit and total return from that decimal value.
Input: decimal odds 2.50 with a 100-unit stake.
2.50 converts to fractional odds of 3/2 and American odds of +150. The raw implied probability is 40.00%. Profit is 150.00 units and total return is 250.00 units.
Input: fractional odds 10/11 with a 100-unit stake.
10/11 converts to decimal odds of 1.9091 and American odds of -110. The raw implied probability is 52.38%. Profit is about 90.91 units and total return is about 190.91 units.
Input: American odds -120 with a 100-unit stake.
-120 converts to decimal odds of 1.8333 and fractional odds of 5/6. The raw implied probability is 54.55%. Profit is about 83.33 units and total return is about 183.33 units.
Yes. Inputs such as 1,91 are normalised to 1.91 before calculation.
Because -110 converts to about 1.9091, while 1.91 is a separately rounded decimal quote. They are close market prices, but they are not mathematically identical.
Some decimal prices cannot be represented cleanly as a short fraction. The converter finds a close fractional equivalent while preserving the original decimal price for probability and payout calculations.
No. Odds formats and implied probability can be converted without a stake. A stake is needed only for the profit and total-return outputs.
No. Decimal, fractional and American formats are alternate representations of the same price, subject only to normal display rounding.
