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.

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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15 Comments on "Card Counting Efficiency Calculator"

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So where is this wonderful efficiency calculator? I don’t see it anywhere.


@observer just use hi-opt 1. It’s simpler, better, and ignoring aces and deuces helps reduce the correlation with hi-lo.

I’m not sure how much I can trust this calculator because it really ought to give some kind of error message if you give it an unbalanced system. Or at least come with some explanation of what it does for an unbalanced counting vector. This casts doubt on whether I can trust ANY of its results. What I’m trying to do is find something which has a low correlation with hi-lo (dot product with the vector -1 1 1 1 1 1 0 0 0 -1, but with the last vector component counting 4 times as much since it’s 10… Read more »
Philippe B

Thank you.
I agree. I use ReKO. It was mainly to calculate how weak Speed Count is.

Philippe B

What about Speed Count and OPP and hand substraction ?


How would I calculate a side count of aces effect?


I am using Knockout counting system with a mild success.
In that book, there is a chart for basic strategy that is a little bit different than what I see everywhere else.
In KO, for a pair of 2 or 3 against the dealers 2 or 3, the decision is to HIT,
But I know that in almost all charts it is advised to split. what should I do here especially if I am playing win no-hole-card rule?

That comment indicates you fundamentally don’t understand how it works to use a counting system to supplement basic strategy decisions. There is no counting system where you just break basic strategy in a consistent way for any reason that is not dependent on the count! For any balanced counting system, when the count is ZERO, then your decision table should match basic strategy exactly. That means you split 2’s and 3’s against a dealer’s 2 or 3, if the count is 0, and that’s why basic strategy says to do that, because on average the count WILL be 0. However,… Read more »

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