Card Counting Efficiency Calculator

This calculator allows you to determine the Playing Efficiency (PE), Betting Correlation (BC) and Insurance Correlation (IC) of any card counting system.

Just plug in the tag values for each card rank and click Calculate.

For example, for the popular Hi-Lo counting system, you would input the tag value -1 for Ace and Ten, and tag value +1 for 2-6. That shows the Hi-Lo count yields PE=0.5114, BC=0.9682, and IC=0.7601.

Sorry, but the Efficiency Calculator currently requires Flash, and your device doesn’t support that.

We hope to eventually publish a new version that will work on all devices. Subscribe to the mailing list if you want to be notified when it arrives.


  • Playing Efficiency (PE): This is a measure of how effectively a counting system can be used to vary strategy. 0.70 is an approximate cap on the highest possible PE for a single parameter counting system.
  • Betting Correlation (BC): This is a measure of how effective a system is in detecting the player’s advantage based on the remaining cards. It is based on how closely the card counting tags match up with the effect of removal of each card rank. Good BC values can approach 1.00.
  • Insurance Correlation (IC): This is a measure of how well a counting system indicates correct insurance betting decisions.

For much more on the technical details of card counting system efficiencies, see Peter Griffin’s book The Theory of Blackjack: The Compleat Card Counter’s Guide to the Casino Game of 21


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