True Count Explained: Why It Matters for Card Counters

If you've learned the basics of card counting, you know about the running count. But the true count is what separates amateur counters from skilled advantage players.

The Problem with Running Count Alone

Imagine two scenarios:

• Running count of +10 with 5 decks remaining
• Running count of +10 with 1 deck remaining

In scenario 1, the +10 is spread across 260 cards. In scenario 2, it's concentrated in just 52 cards. The second situation is far more favorable—but the running count treats them the same.

What is True Count?

The true count normalizes your running count based on remaining decks:

True Count = Running Count ÷ Decks Remaining

This gives you a standardized measure that works regardless of how many decks are in play or how far into the shoe you are.

How to Estimate Decks Remaining

Most card counters estimate decks remaining by looking at the discard tray:

• Visual estimation: A standard deck is about 2cm thick
• By cards dealt: Count rough sections of 52 cards
• By rounds: Approximately 3-4 cards per player per round

With a 6-deck shoe:

• Start: 6 decks remaining
• Discard tray shows 1.5 decks: 4.5 remaining
• Discard tray shows 3 decks: 3 remaining

True Count Examples

Example 1: Early in Shoe

• Running count: +4
• Decks remaining: 5
• True count: +4 ÷ 5 = +0.8 (round to +1)

Example 2: Late in Shoe

• Running count: +4
• Decks remaining: 1.5
• True count: +4 ÷ 1.5 = +2.7 (round to +3)

Same running count, very different betting situations!

Why True Count Matters for Betting

Your edge increases roughly 0.5% for every +1 true count above zero. This is why proper bet sizing must be based on true count:

Deck Penetration Matters

Deck penetration is how far into the shoe the dealer goes before reshuffling. Better penetration = more opportunities for high true counts.

• Poor penetration (50%): Rarely see TC above +2
• Average penetration (75%): Occasionally see TC +3 to +4
• Good penetration (85%+): Regular opportunities at TC +4 or higher

Always seek tables with 75%+ penetration.

Common True Count Mistakes

1. Not Converting at All

Many beginners bet based on running count alone. Don't make this mistake.

2. Forgetting to Reconvert

The true count changes as more cards are dealt. Recalculate frequently—at least every round.

3. Over-Precision

Don't worry about calculating to decimal places. Round to the nearest whole number.

4. Ignoring Negative Counts

When TC is negative, the house edge increases. Many counters leave the table or bet minimum.

Practice with Real-Time Tracking

Our blackjack card counter tool automatically calculates both running count and true count as you input cards. Use it to:

• Verify your mental calculations
• Understand how TC changes throughout a shoe
• Practice bet sizing based on true count
• See the EV impact of different counts

Key Takeaways

• True count = running count ÷ decks remaining
• Bet sizing should be based on true count, not running count
• Your edge increases ~0.5% per +1 true count
• Seek tables with good deck penetration
• Practice estimating remaining decks quickly

Ready to master true count calculations? Use our free tool to practice →