What Is CRT (Candle Range Theory)? A Plain-English Guide for Traders

If you spend any time around smart-money or ICT-style trading, you'll run into Candle Range Theory (CRT) fast. The name sounds technical, but the core idea is simple — and once it clicks, you start seeing it on almost every chart.

This is a plain-English guide to what CRT is, how it works, and why traders use it. No jargon walls, no fluff — just the concept, clearly.

What is Candle Range Theory?

Candle Range Theory is a way of reading price that uses the range of a single candle — its high to its low — as a map for what price is likely to do next.

Instead of treating a candle as just one bar on a chart, CRT treats that candle's range as a zone: a high, a low, and a midpoint. Price then interacts with that zone in a repeatable way — reaching for one edge to grab liquidity before expanding toward the other.

In one sentence: one candle sets the playing field, and the candles that follow tend to sweep one side of it, then run to the other.

How CRT works: the candle range concept

Most traders break a CRT setup into three phases. Picture a single higher-timeframe candle:

1. The range

A candle forms with a defined high and low. That range becomes your reference — the area price is working within. The midpoint (the 50% level) often acts as equilibrium: fair value sitting between the two extremes.

2. The sweep

Price pushes beyond one edge of the range — above the high or below the low — taking out the orders resting there (stop losses and breakout entries). This is the part that traps people: it looks like a breakout, but it's often a liquidity grab, not a genuine move.

3. The expansion

After the sweep, price reverses and expands toward the opposite side of the range. The edge that got swept becomes the origin of the move; the untouched edge becomes the target.

Build a range, sweep one side, expand to the other — that rhythm is the heartbeat of CRT. It's closely related to the Accumulation → Manipulation → Distribution (AMD) idea, sometimes called the "Power of Three," from ICT-style trading.

Why CRT matters for traders

A few reasons the concept has caught on:

• It's structured. Instead of guessing, you have defined levels to work from: the high, the low, and the midpoint of the range.
• It's built around liquidity. CRT explicitly accounts for the stop-run that shakes most traders out — so you're reading the trap instead of falling into it.
• It scales across timeframes. The same range logic applies to a weekly candle or a 5-minute candle, so you can use a higher timeframe for context and a lower one for entries.
• It's objective enough to test. Because the levels come from a candle's range, you can write the rules down — and rules can be measured and backtested.

How to practice (and backtest) CRT

Reading about CRT and trading it live are two very different things. The gap between them is reps — seeing the setup form, in real time, enough times to trust it under pressure.

That's exactly what backtesting is for. Drop into historical price, replay it one candle at a time, and watch CRT play out setup after setup — without risking a dollar. For the full step-by-step process, we broke it down here: How to Backtest the CRT Strategy.

You can practice CRT on real market history in CRTLAB for free — pick a market, replay it bar by bar, and mark the range, the sweep, and the expansion yourself. It's the fastest way to turn "I understand CRT" into "I can trade CRT."

The bottom line

Candle Range Theory comes down to one repeatable idea: a candle's range sets the stage, price sweeps one side to grab liquidity, then expands toward the other. Learn to read that rhythm — and put in the reps to trust it — and you've got a structured, testable way to approach the market.