Running Count vs. True Count Explained
Note: This page assumes familiarity with basic card counting concepts and the Hi-Lo system specifically. If you are new to counting, start with our Card Counting overview and Hi-Lo System guide before reading this.
The true count is one of the most important concepts in card counting — and one of the most commonly misunderstood. Many beginning counters learn to track the running count but never properly learn the true count conversion, which limits the accuracy of both their betting decisions and strategy deviations. This page explains clearly what the true count is, why it matters, and exactly how to calculate it under game conditions. For broader context on card counting systems, Wikipedia's card counting article provides useful background.
What Is the Running Count?
The running count is the cumulative total of all Hi-Lo values (or whichever counting system you use) since the beginning of the shoe. Every time a card is dealt and you see it, you add or subtract its value from your running total. The running count tracks the overall balance of high versus low cards that have been removed from the shoe so far.
A positive running count means more low cards than high cards have been removed — the remaining shoe is relatively rich in high cards, which is favorable for the player. A negative running count means more high cards have been removed — the remaining shoe leans toward low cards, which is unfavorable.
Why the Running Count Alone Is Insufficient
Here is the core problem with relying solely on the running count: its significance depends entirely on how many cards remain in the shoe.
Consider these two scenarios with a running count of +6:
| Scenario | Running Count | Decks Remaining | High Cards Per Deck Above Neutral |
|---|---|---|---|
| A | +6 | 6 decks | +1 per deck — very modest advantage |
| B | +6 | 1 deck | +6 per deck — very strong advantage |
Both scenarios have a running count of +6, but Scenario B is far more advantageous than Scenario A. In Scenario B, a full deck remaining has six more high-card "units" than a neutral deck — that is a strongly favorable condition. In Scenario A, those six high-card units are spread across six decks, making each individual deck only marginally richer than average.
The running count alone cannot distinguish between these situations. The true count can.
The True Count Formula
The true count normalizes the running count by accounting for the number of decks remaining in the shoe:
True Count = Running Count ÷ Decks Remaining
Using the examples above:
- Scenario A: True Count = +6 ÷ 6 = +1
- Scenario B: True Count = +6 ÷ 1 = +6
Now the difference is clear. A true count of +1 represents a modest advantage. A true count of +6 represents a very strong advantage. The betting and strategy deviation decisions that follow from each are very different.
How to Estimate Decks Remaining
Calculating the true count requires knowing how many decks remain in the shoe — which means estimating them from visual cues during play.
The primary method is watching the discard tray. As hands are played, used cards accumulate in the discard tray on the dealer's right. By estimating how thick the discard pile is, you can infer how many decks have been used, and subtract from the total shoe size to get decks remaining.
Practice tips for estimating deck depth:
- A single deck is approximately 0.75 inches (19 mm) thick when unsleeved.
- In a 6-deck shoe with roughly 1 deck in the discard tray, approximately 5 decks remain.
- With 3 decks in the discard tray of a 6-deck shoe, approximately 3 decks remain.
- You do not need exact precision — rounding to the nearest half-deck is sufficient for practical purposes.
Practice at home by stacking cards into piles of one deck, two decks, three decks, and so on, and training yourself to visually recognize each stack size.
True Count Calculation Examples
| Running Count | Decks Remaining | True Count | Interpretation |
|---|---|---|---|
| +8 | 4 | +2 | Modestly favorable — increase bet slightly |
| +8 | 2 | +4 | Strongly favorable — significant bet increase |
| +8 | 1 | +8 | Very strongly favorable — maximum bet |
| -4 | 2 | -2 | Unfavorable — bet minimum |
| 0 | 4 | 0 | Neutral — bet minimum |
| +3 | 3 | +1 | Slight advantage — small bet increase |
| +12 | 2 | +6 | Extremely favorable — maximum bet appropriate |
True Count and Betting Decisions
All bet spreading decisions for balanced counting systems (Hi-Lo, Omega II, etc.) are based on the true count. Here is a general guide to how the true count maps to betting decisions in a standard 6-deck game:
| True Count | Player Edge Approx. | Recommended Bet Action |
|---|---|---|
| Below 0 | House has 1%+ edge | Minimum bet |
| 0 | House has ~0.5% edge | Minimum bet |
| +1 | Roughly neutral | Minimum or slight increase |
| +2 | Player has ~0.5% edge | 2x–3x minimum |
| +3 | Player has ~1% edge | 4x–6x minimum; take insurance |
| +4 | Player has ~1.5% edge | 6x–8x minimum |
| +5 or above | Player has 2%+ edge | Maximum bet |
True Count and Strategy Deviations
Strategy deviations are triggered by specific true count thresholds — called index numbers. The most important examples:
| Hand | Dealer | Deviation | True Count Threshold |
|---|---|---|---|
| Insurance | Ace | Take insurance | +3 or higher |
| Hard 16 | 10 | Stand instead of surrender/hit | 0 or higher |
| Hard 12 | 3 | Stand instead of hit | +2 or higher |
| Hard 11 | Ace | Double instead of hit | +1 or higher |
| Hard 10 | 10 | Double instead of hit | +4 or higher |
For the full list, see our Strategy Deviations page.
Half-Deck vs. Full-Deck Precision
For most purposes, estimating remaining decks to the nearest half-deck is sufficient. Dividing by a non-integer (e.g., dividing a running count of +7 by 2.5 to get a true count of +2.8) is mentally demanding, and rounding to +3 is close enough for all practical betting and deviation decisions.
The rule of thumb: when in doubt, round the true count down (toward zero) when making betting decisions. This is the conservative approach and errs on the side of reducing rather than inflating your perceived edge.
True Count for Unbalanced Systems
Unbalanced systems like KO and Red 7 are specifically designed to eliminate the true count conversion step. Their unbalanced card values build in a natural adjustment that makes the running count itself useful for betting decisions without division. See our Other Counting Systems page for details on how these systems work.