Arms Index (TRIN) Indicators - Know About TRIN Technical Analysis | Espresso

Everything You Need to Know About TRIN Indicators

The experts in stock trading will say how they rely majorly on financial charts, technical data, and other trade indicators to make selling, buying, and stock holding decisions. This helps them track the trends in the stock market and make changes in the stock momentum and stock values.

Published on 01 March 2023

One such stock market indicator is a TRIN indicator that the stock traders totally trust when making trading decisions.

So, what is this particular stock market indicator all about? Let’s find out below!

What is TRIN Technical Analysis?

The TRIN index was invented by Richard W. Arms Jr. in 1967. It is a short-term trading index. The TRIN index chart is an indicator for technical analysis for stock traders. It is also often termed the Arms Index, and it is used for comparison between the advancing and declining of the stock numbers and the advancing and declining of the stock volumes.

The TRIN technical analysis measures the market sentiments. It also measures the stock market’s supply and demand ratio and the relation between them. TRIN indicators can be used to predict future stock market prices as well. Fundamentally, this stock market indicator is based on intraday trading. And it also forecasts the future movements in prices of stocks by generating the oversold and overbought stock levels. In turn, this also ascertains the time at which the stock index would change its direction.

Calculating the TRIN Stock Market Indicator

TRIN index is available on several stock charts. As an experienced trader, you can calculate the same manually. The following steps will help you determine the TRIN stock market indicator easily:

  • The AD ratio (advancing and declining) can be computed at various intervals. This can be every few minutes or hours. So, by dividing the advancing shares with the declining shares, you can find out the AD (advancing and declining) ratio.
  • The second step in finding out the TRIN index is by dividing the total declining volume and the total advancing volume. This way, you will be able to determine the advancing and declining ratio volume.
  • In the third step, by dividing the AD with the AD volume, you will determine the AD (advancing and declining) ratio.
  • You can now record the results on the graphs.

Finally, you can repeat all the above-listed steps to compute the TRIN indicator index for the next interval you choose. You can create a graph and connect the data points to see the TRIN index movement over a period.
Also Read: Trading Charts

TRIN Index Formula

TRIN Indicator = (advancing stocks ÷ declining stocks) ÷ (advancing volume ÷ declining volume)

First, divide the number of the day’s advancing stock by the number of the day’s declining stocks. Next, divide the volume of the day’s advancing stocks with the volume of the day’s declining stocks. Finally, divide the result of the first division with the result of the second division.

TRIN Technical Analysis – Steps Involved

The TRIN index provides a compelling explanation of the complete stock market movements, like the ones in BSE and NSE. It provides an arm index and provides an analysis of the strength of these movements. Here are some of the instances of how you can analyse the TRIN indexes–

  • When the TRIN index value is 1.0, it is an indication that the AD is equivalent to the AD volume ratio. When the index value is equivalent to 1.0, the stock market movement is considered to be neutral. The reason is that the up-AD volume is equally distributed over each advancing issue. And the down AD volume gets equally distributed over the declining issues.
  • The professional analysts think that the TRIN index indicates a bullish nature when its value is less than 1.0. The reason is that the average up-stock has more volume as compared to the average down-stock. They also feel that when the long-term equilibrium of the index is below 1.0, the market’s nature is bullish.
  • Now, when the index is more than 1.0, it gives the sign of a bearish nature of the market. This indicates that the average up-stock is lower than that of the average down-stock.
  • The difference between the selling and purchase of stocks and securities depends upon how far the value of the TRIN indicator is from 1.0. if the value is more than 3.0, it gives an indication of oversold or bearish market sentiment. So this could also point towards an upwards trend in the value of the stocks and indices.
    Also Read: What do you mean by Bear & Bull Market?
  • Finally, when the TRIN index value is lower than 0.50, it could again indicate a market that is overbought. And this will showcase the bullish sentiment of the market.


Stock traders will consider the TRIN indicator’s value and keep a tab on how it alters throughout an intraday trading session. To have a perfect view of the market’s direction, they also monitor any extremes in the TRIN indicator values.

Chandresh Khona
Team Espresso

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