Free tools
Free sports betting tools.
The same math sharp bettors run before every bet. Check the value, convert any odds, or spot a sure-profit split between books.
FreeNo sign-upWorks on your phone
ODDS CHEAT SHEETImplied chance
−20066.7%
−15060.0%
−11052.4%
+10050.0%
+15040.0%
+20033.3%
chance = 1 ÷ decimal oddsConvert any odds →
Pick a tool
Three questions, answered in seconds.
Each example below uses real math. Open a tool to try your own numbers.
01
IS THIS BET WORTH IT?EV calculator
Enter the odds and your chance of winning to see the expected value and a suggested stake.
Your chance55%
Odds+110
Expected value+15.5%
02
WHAT DO THESE ODDS MEAN?Odds converter
Switch between American, decimal, fractional and implied chance, and remove the vig from any two-way market.
American−150
Decimal · fractional1.67 · 2/3
Implied chance60.0%
03
DO THE BOOKS DISAGREE?Arbitrage calculator
Check whether prices at different books lock in a profit, and how much to stake on each side.
Book A · Book B+105 · +105
$50 on each side returns$102.50
Locked profit+2.5%
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