TRIX Indicator: Triple Smoothed Momentum Explained
TRIX is a momentum oscillator that measures the rate of change of a triple-smoothed exponential moving average of price. It oscillates around zero, and the sign of the reading tells you whether that heavily smoothed trend line is rising or falling.
The design goal is noise removal. By smoothing three times before measuring momentum, TRIX strips out most short-term jitter, which is why its zero-line crossings are far less frequent than those of a simple momentum indicator. The cost of that cleanliness is lag, and the lag is real.
How TRIX is calculated
Four steps, in order. The standard period n is 15, though 14 and 18 are also used.
- EMA1 = an n-period EMA of the closing price.
- EMA2 = an n-period EMA of EMA1.
- EMA3 = an n-period EMA of EMA2.
- TRIX = ((EMA3 today minus EMA3 yesterday) divided by EMA3 yesterday) x 100
Recall that each EMA uses a smoothing factor of k = 2 divided by (n plus 1). For n equal to 15 that is 0.125, so each pass keeps 87.5 percent of the previous value and adds 12.5 percent of the new input. Applying that three times is what makes EMA3 so smooth.
Because the final step divides by the previous EMA3, TRIX is a percentage change and is comparable across instruments. A TRIX of 0.15 on the Nifty 50 and 0.15 on a Rs 300 stock describe the same rate of change, which you cannot say of a momentum reading in rupees.
An illustrative calculation
Illustrative numbers only. Suppose EMA3 on the Nifty 50 reads 24,000 yesterday and 24,036 today. TRIX = ((24,036 minus 24,000) divided by 24,000) x 100 = 0.15. If EMA3 then reads 24,060 the next day, the change is 24 points on 24,036, so TRIX falls to 0.0998. The line is still positive, meaning the smoothed trend is still rising, but momentum has halved.
The signal line and how to read TRIX
Most platforms plot a signal line alongside TRIX, usually a 9-period EMA of TRIX itself. That gives you two standard readings plus one more.
| Observation | Conventional reading |
|---|---|
| TRIX crosses above zero | The triple-smoothed trend has turned up |
| TRIX crosses below zero | The triple-smoothed trend has turned down |
| TRIX crosses above its signal line | Earlier and noisier version of the same idea |
| TRIX rising while price makes lower highs | Momentum divergence, treated as a warning |
| TRIX flat near zero | No sustained trend, the indicator has nothing to say |
The zero-line cross is the primary signal and the slowest. The signal line cross fires earlier and more often, so the two suit different tolerances. Some traders watch the slope rather than the level, since a positive but falling TRIX means an uptrend that is decelerating.
Why triple smoothing cuts noise but adds lag
Each EMA pass delays the response to a price change. Stacking three of them compounds that delay, so TRIX can turn several sessions after price has already reversed. On a 15-period setting on daily data, that delay is often a week or more.
Here is the trade-off. Take an illustrative Bank Nifty fall from 52,000 to 49,500 over four sessions. A fast momentum measure flips negative at once, and if the fall was a shakeout it flips back and you have paid costs for nothing. TRIX may not cross zero at all, which saves the bad trade but leaves you late to a genuine reversal that starts the same way.
You cannot have both. That is the specific risk with TRIX: entries and exits are late by design, so a strategy built on it needs wider stops and a longer holding period to survive the delay. Used on short intraday timeframes for quick trades, the lag defeats the purpose.
A common misconception
TRIX is sometimes called a leading indicator because it can diverge from price before a turn. That is a misreading. TRIX comes entirely from past closes and is smoothed three times, which makes it one of the more lagging tools in use. Divergence is an observation about the past, not a forecast.
Frequently Asked Questions
How is TRIX different from MACD?
MACD is the difference between two EMAs of different lengths, expressed in price units. TRIX is the percentage rate of change of one triple-smoothed EMA, so it is scale free and much smoother, giving fewer signals.
What settings should I start with?
Fifteen periods with a 9-period signal line is the usual default on daily charts. Shortening the period speeds it up and reintroduces the noise the triple smoothing was meant to remove, so change it deliberately rather than casually.
Does TRIX work in a sideways market?
Poorly, like most trend tools. In a range TRIX hovers near zero and crosses back and forth on small moves, so many traders ignore signals unless the reading is clearly away from zero.
Can TRIX be used on Nifty options?
You would apply it to the underlying index rather than to a premium series, since premiums decay with time and distort any momentum measure. Even then, the lag makes it a poor fit for weekly expiry contracts.
Key Takeaways
- TRIX is the percentage rate of change of a triple-smoothed EMA of closing price, usually with n equal to 15.
- Each EMA pass uses k = 2 divided by (n plus 1), and three passes remove most short-term noise.
- The zero-line cross is the main signal, while the 9-period signal line cross fires earlier and more often.
- Triple smoothing buys fewer false signals at the price of several sessions of lag.
- TRIX is a lagging measure, not a leading one, and the figures used here are illustrative.
