Online Share Trading

What is 30-Day Moving average?

The 30-day moving average (MA), is a technical indicator that shows how stock prices are moving in a short-term. It simply represents the average closing price over the past 30 days. It is a simple moving average such as a 30-day MA that can be used by short-term traders to gauge the direction in which prices will move in the near future.

Representation Of A 30 Day Moving Average from BSE Sensex

The purple line, which represents the 30-day MA, shows how stock prices have moved over the past month. It shows how they fluctuated between rising and falling before starting a downward trend.


The moving average for 30 days is an excellent indicator of the price trend in the very short-term. It helps to clear out daily price fluctuations and also reflects volatility. Prices tend to fluctuate in the short-term. This is why moving averages that are shorter-term may not be as smooth or as consistent as long-term averages.

Nearer To Current Price Action

The 30-day moving average stock price brings you closer to current market trends.

Does Not Have A Big Lag Effect

This is a major difference between the short-term and long-term moving averages. Because they consider historical prices over a longer period, the long-term moving averages have a greater lag effect than dynamic price action in today's present. They serve an important purpose for long-term investors who are interested in wealth creation, not daily trading.

Simple To Calculate

Simple moving averages such as a 30-day MA can be calculated easily and are also customizable. Simply add the closing prices for a stock or index over the desired number of days (1+day 2+day 1) and divide that number by the number 'n' (also known as the number period).

Useful for Buy/Sell Decisions

Short term traders don't have to constantly monitor prices manually. Instead, they rely on moving averages for short term buy and sell decisions. The price crossover strategy allows traders to either buy, go long or sell when the price is higher than the moving average. When the stock price falls below the moving average, they sell or short it. To make more profit, this strategy can be supported by the volume principle. This strategy would allow traders to only trade long if the price rises above the MV. It is also supported by thickening trading volumes. Stocks with a 30 day moving average are those that have performed well over the 30-day average.


A simple moving average, such as a 30-day MA, helps to smoothen out the effects of dynamic stock price movements. Also known as the "noise" of price action. Trends can be reflected in moving averages. A rising trend may indicate a rise in prices. Conversely, a slope that is downward looking could indicate a decline in prices. An indication of whether prices have topped or bottomed can be seen in the slope.

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