True Count Calculator
Convert running count to true count instantly. Estimate decks remaining from the discard tray. Get bet ramp recommendations. Built for Hi-Lo, Hi-Opt II, Zen and any balanced card counting system.
Run the conversion
Enter your running count and decks remaining. Reverse mode gives you the running count threshold needed to hit a target true count.
🎴 Deck estimation helper (if you only know cards seen)
+Don't know decks remaining off the top of your head? Enter total decks in the shoe and an estimate from the discard tray.
The bet ramp — bet your edge
For the Hi-Lo true count. Bet 1 unit (the table minimum) until the true count reaches +2 — below that the house still has the edge. From +2 each true count is worth about half a percent to you, so the bet grows with it, to the top of your spread by +5. Shown for a 1–8 spread (pick yours above); where published ramps differ, the range they cover is in brackets under the bet and any bet in it is right — the same rule our blackjack trainer and Bet Spread Trainer grade by. Edge values are approximate for typical 6-deck S17 rules.
| True count | Bet | Edge | What's happening |
|---|---|---|---|
| ≤ 0 | 1u | −0.5% | House edge. Bet table minimum and ride it out. |
| +1 | 1u | ~0% | Edge is roughly even. Every published ramp still bets the minimum here. |
| +2 | 2u | +0.5% | First true edge. Most index plays start kicking in here. |
| +3 | 4u(3–4) | +1.0% | Solid edge. Insurance becomes profitable at TC +3. |
| +4 | 6u(4–8) | +1.5% | Strong edge. Published ramps differ most here — anything in the range is right. |
| +5 | 8u(6–8) | +2.0% | Very strong — the top of your spread. Going past it depends on bankroll and casino heat tolerance. |
| +6+ | 8u | +2.5%+ | Rare. Stay at the top of your spread. |
What the true count actually does
The running count tells you how the deck has shifted from neutral. The true count tells you how much that shift matters right now, given how much deck is left to play. A running count of +5 with 5 decks remaining is barely above neutral. A running count of +5 with 1 deck remaining is a goldmine. The number's identical; the situation isn't.
The formula
That's it. The whole conversion. Standard practice is to round the result down (floor) to be conservative — a true count of +2.5 floors to +2, and you act as if you're at +2. This matches how the Illustrious 18 index numbers and most published deviation tables are calibrated.
Estimating decks remaining
This is the part that takes practice. Most counters glance at the discard tray between hands and estimate to the nearest half-deck. Published simulations comparing precision levels show:
- Full-deck precision: the baseline EV
- Half-deck precision: about 6% more EV than full-deck
- Quarter-deck precision: about 7% more EV than full-deck (only 1% more than half-deck)
The takeaway: half-deck precision captures almost all the gain. Quarter-deck is theoretical max, but the cost is more obvious staring at the discard tray, which raises heat. Most pros stick to half-deck.
Penetration matters more than rules
Counting works because of how much shoe gets dealt before the dealer shuffles. A casino can have great rules (S17, DAS, surrender, 3:2 blackjack) but if they cut off 2.5 decks of a 6-deck shoe (~58% penetration), the count rarely gets high enough late enough to extract meaningful EV. Conversely, a so-so ruleset with 80%+ penetration is highly beatable.
If your true count is rising late in a deep-penetration shoe, that's where the money is made. Most of the EV from card counting comes from a small percentage of hands with a high true count near the end of well-penetrated shoes.
Where the bet ramp comes from
Bet in proportion to your edge. The house is still ahead up to a Hi-Lo true count of +1, so the bet stays at the minimum; from +2 each true count adds about half a percent, and the bet grows with it until it reaches the top of your spread around +5, where the edge is roughly 2%. Published ramps — Blackjack Apprenticeship's, CardCountingLab's, the ones on the blackjackinfo forums — all bet the minimum up to +1 and raise at +2; they differ only in how fast they climb after that, which is why the table shows a range. As you advance, you'll fit the ramp to your bankroll, risk tolerance, and how much heat you can absorb.
The edge percentages in the ramp table are approximations for typical 6-deck S17 DAS rules. Other rule sets shift them slightly. CVCX is the standard tool for custom ramp simulation and EV-by-spread data for typical rule sets.
What's next
Once you can convert true count smoothly, the next layer is index play — deviating from basic strategy when the count crosses certain thresholds. Don Schlesinger's Illustrious 18 + Fab 4 covers the 22 highest-impact deviations and is now live as a dedicated reference. Pair it with the 9 counting systems comparison and the basic strategy chart for the complete card counter's toolkit.
Frequently asked questions
The questions counters ask about converting and using the true count.
What is the true count in blackjack?
The true count is the running count divided by the number of decks remaining in the shoe. It tells you the count per deck, which is the actual number you use to make betting and playing decisions. A running count of +6 with 3 decks remaining is a true count of +2 — and that +2 is what you act on, not the +6.
How do I estimate decks remaining at a real blackjack table?
Look at the discard tray. With practice you can eyeball how many decks of cards are stacked there, and subtract from the total decks in the shoe. Most counters round to the nearest half-deck.
Half-deck precision captures roughly 95% of the EV available from quarter-deck precision, with much less mental load and less suspicious staring at the tray.
Do I always need to convert running count to true count?
If you use a balanced system (Hi-Lo, Hi-Opt II, Omega II, Zen, Wong Halves, Uston APC) — yes. Balanced systems require the conversion because the running count's meaning changes as the shoe depletes.
If you use an unbalanced system (KO, Red 7), you skip the conversion and bet directly off the running count once you hit the system's pivot point.
Should I round, floor, or truncate when calculating true count?
Standard practice is to floor (round down) the true count. A running count of +5 with 2 decks remaining gives 2.5, which floors to true count +2. The reasoning is conservative betting and play — you want to be confident the true count is at least that high before deviating from basic strategy.
The QFIT simulator and other standard tools default to flooring; their published index numbers (Illustrious 18, etc.) assume floored true counts.
What does the bet ramp on this calculator recommend?
Bet 1 unit (the table minimum) until the Hi-Lo true count reaches +2. From there the bet grows with your edge, to the top of your spread by +5. On a 1–8 spread: 2 units at +2, 3–4 at +3, 4–8 at +4, 6–8 at +5, 8 from +6.
Published ramps agree on the minimum up to +1 and on raising at +2; they differ only in how fast they climb after that, so the calculator shows the bet in proportion to your edge and the range any of them would make. Pick your spread above the results.
Why does penetration matter so much?
Penetration is the fraction of the shoe that gets dealt before the dealer shuffles. If a casino cuts off 2 decks of a 6-deck shoe (33% cut, 67% penetration), card counting works but with reduced edge. If they cut off 2.5 decks (~58% penetration), counting becomes barely profitable. Below that, it's a losing game.
Can I use this calculator for systems other than Hi-Lo?
Yes — the running count to true count conversion (running count divided by decks remaining) is identical for every balanced counting system. Hi-Lo, Hi-Opt I, Hi-Opt II, Omega II, Zen, and Wong Halves all use the same conversion.
The bet ramp on this page is for the Hi-Lo true count. In another balanced count a true count point is worth a different edge — a Zen or Omega II +4 is worth about a Hi-Lo +2 — so convert before you bet; the blackjack trainer does it for you. Unbalanced counts like KO and Red 7 bet off the running count instead.
How accurate does deck estimation need to be?
Per published simulations: full-deck precision gives a baseline EV. Half-deck precision adds about 6% more EV. Quarter-deck precision adds another 1% on top of that.
Almost all of the value comes from getting half-deck precision right; the gain from quarter-deck precision is small and comes at the cost of more obvious staring at the discard tray. Half-deck is the practical sweet spot.