I'm developing a poker software for some time already, and decided to compare the results of my game with several popular online poker equity calculators.

I'm surprised that out of 4 different calculators only one matches the results that my game generates.

Example cards / my results:

Player 1: 8cKs / 98.58%

Player 2: Kh4d / 1.41%

Board: 5c8s9h

This are the sites I visited for comparison:

Site 1: 97% vs 0,3 %

Site 2: 63,5% vs 0,3%

Site 3: Same as mine

Site 4: 97.47% 0,30%

Why is this so? How can these results be different? the math is very simple and math can't produce different results if correct calculation is done.

Can you explain this, and how do we get 100% correct results? because those online calculators obviously can't be trusted.

I'm developing a poker software for some time already, and decided to compare the results of my game with several popular online poker equity calculators.

I'm surprised that out of 4 different calculators only one matches the results that I'm generating.

Example cards / my results:

Player 1: 8cKs / 98.58%

Player 2: Kh4d / 1.41%

Board: 5c8s9h

This are the sites I visited for comparison:

Site 1: 97% vs 0,3 %

Site 2: 63,5% vs 0,3%

Site 3: Same as mine

Site 4: 97.47% 0,30%

Why is this so? How can these results be different? the math is very simple and math can't produce different results if correct calculation is done.

Can you explain this, and how do we get 100% correct results? because those online calculators obviously can't be trusted, they don't even match between them self.