Intermediate5 min2026-05-14Open

CCI (Commodity Channel Index)

An oscillator that measures how far the current price has strayed from its recent statistical mean. Built for commodity cycles, now used across every market.

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Overview

The CCI (Commodity Channel Index) was published by Donald Lambert in 1980. Originally designed to capture the cyclical rhythms of commodity markets, it now appears on equities, currencies, and indices alike.

CCI quantifies how far the current typical price has drifted from its average over a recent window. Where RSI and Stochastic are pinned to a 0–100 scale, CCI has no fixed ceiling or floor. A reading beyond ±100 signals that the market has stepped outside its statistically usual range — that price is, in some meaningful sense, no longer behaving like itself.

Calculation

Formula

Typical Price (TP) = (High + Low + Close) ÷ 3
CCI = (TP − n-period SMA of TP) ÷ (0.015 × n-period mean deviation)
Mean Deviation = average of ｜TP − SMA｜ over n periods
Standard parameter: n = 20

The numerator measures how far the current typical price has wandered from its recent centre.
The denominator uses mean deviation — the average size of those wanderings — not standard deviation. The distinction matters.
Lambert's constant 0.015 was chosen empirically so that roughly 70–80% of CCI readings fall between ±100.

In other words, ±100 is not an absolute "overheated" threshold. It is the statistical line that says: the market has stepped outside its usual range.

How to read it

CCI with the ±100 boundary as the entry point to abnormal-deviation territory — ±100 is not a reversal forecast — it is the statistical line where price has stepped outside its usual range. Follow the break in a trend; fade it in a range.View OANDA:USDJPY live →

Basic interpretation around ±100

CCI above +100 → unusual upward deviation. Trend-followers add or hold longs; contrarians watch for exhaustion
CCI below −100 → unusual downward deviation. Trend-followers stay short; contrarians watch for a bounce
CCI at 0 → price sits at its recent mean — a neutral state

Two opposite readings of the same line

What makes CCI peculiar is that the same threshold supports opposing interpretations, depending on regime.

Approach	Cross above +100	Cross below −100
Trend-following	Start of a strong move, buy	Start of a strong decline, sell
Contrarian	Overheated, look to fade	Capitulation, look to buy the dip

Lambert himself favoured the trend-following reading — treating ±100 as the moment an unusual move begins. The contrarian reading came later, through practice.

Divergence

If price prints a higher high while CCI prints a lower high (bearish divergence), or price prints a lower low while CCI prints a higher low (bullish divergence), the same logic that applies to RSI applies here.

Period guide

Period	Character
14	Short-term; noisy
20	Lambert's standard; well balanced
50	Longer-term; fewer signals, higher conviction

Market psychology

✦ Market Psychology

In a single line, CCI asks: how far has the price strayed from its ordinary self? — and reads that distance as the temperature of the crowd's emotional reach.

Take the current typical price, subtract the 20-period average, divide by the average size of past deviations. When CCI prints +200, it means the price now sits more than twice the usual distance above its mean. The collective ardour of participants has lifted the market to twice its statistical resting state.

In this moment, those who missed the rally rush in late, afraid of being left behind. Those who bought earlier nurse their unrealised gains and delay taking profit. The two psychologies compound, and the price wanders further from its centre. The extreme reading is, in effect, a thermometer of a crowd that has lost its composure.

But here lies a trap specific to CCI. Where RSI hits a ceiling at 100, CCI keeps climbing — to +300, +400, and beyond. The +200 you thought was overheated may turn out to be a way-station. There is no absolute overbought level. That is not a flaw; it is the indicator's honest acknowledgement that markets, when they break from the ordinary, can run further than common sense allows. CCI's job is to keep drawing the deviation, however far it stretches.

This is also why the trend-following and contrarian readings coexist. At the moment ±100 is crossed, CCI alone cannot say whether the anomaly is beginning or ending. Trend direction, volume confirmation, the longer structural backdrop — CCI only becomes meaningful when paired with other context.

Caveats

RSI — Momentum read from the gains-to-losses ratio
Stochastic Oscillator — Position within the recent range
Moving Average — Trend filter needed to choose CCI's interpretation mode

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