Trading Indicators Explained: EMA, RSI, VWAP, ATR and Bollinger Bands

An indicator is a calculation on price, and sometimes volume, drawn on the chart to make one feature of the market easier to see. None of them predict anything. The useful ones describe the present clearly: which way the market is leaning, how fast, how far from normal, and how much it is moving. These five do that job between them, and most of the other hundred in your platform's menu are variations on one of them.

What is EMA in trading?

The exponential moving average is the average closing price over a set number of bars, with more weight on the recent ones. A 20 EMA on a daily chart is roughly the last month's average price, tilted towards this week. Because the weighting favours recent bars, the EMA turns sooner than a simple moving average and sits closer to price.

Common settings. 20 and 50 for the trend on most timeframes, 200 as the long-term dividing line. Day traders often use 9 or 21 on the hourly and fifteen-minute charts.

What it is good for. Defining the trend and locating pullbacks. If price is above a rising 20 EMA, the short-term trend is up and dips to the line are the places to look for longs. The relationship between two EMAs (20 above 50 or below) gives a cleaner trend read than eyeballing the bars. Markets Mastered's trends grid is built on exactly this kind of multi-timeframe trend read, scored every 15 minutes.

The classic mistake. Trading the crossover as a signal in its own right. A 20/50 crossover tells you the trend changed some time ago; in a ranging market it will cross back and forth and lose money on every turn. Use the EMA to filter direction, not to time entries.

What is RSI in trading?

The Relative Strength Index compares the size of recent up closes with recent down closes and scales the result from 0 to 100. The standard 14-period RSI on a daily chart asks, over the last fourteen days, how much of the movement was up versus down. Above 70 is called overbought, below 30 oversold.

Common settings. 14 is the default and the one most participants watch. Thresholds of 70/30 in a range; 60/40 in a trend, because a strong uptrend rarely lets RSI fall below 40.

What it is good for. Spotting momentum fading into a level, and divergence: price makes a new high while RSI makes a lower high, which says the push is running on less energy. Divergence at a well-defined resistance level is a reasonable place to look for a short, with the stop beyond the high.

The classic mistake. Selling because RSI is "overbought". In a trending market RSI can sit above 70 for weeks. Overbought is a description of strength, not a sell signal. The traders who short every reading over 70 in a bull run are the ones providing the fuel.

What is the VWAP indicator?

Volume Weighted Average Price is the average price of the session weighted by the volume traded at each price. Where volume was heavy, that price counts for more. The result is a line that represents the session's fair value as the market itself has voted on it. Institutional desks use it as a benchmark: buying below VWAP is a good fill, selling above it is a good fill.

Common settings. VWAP resets each day by default. Anchored VWAP starts the calculation from a chosen bar, often a major high, low or news event.

What it is good for. Intraday mean reversion and trend confirmation. In a trending session, price stays on one side of VWAP and pullbacks to the line are entries. In a quiet session, price oscillates around it and the extremes a standard deviation or two away are fades.

The classic mistake. Forgetting that forex volume is not real volume. There is no central exchange, so your chart shows tick volume from one broker's feed. On the majors it tracks true activity reasonably well; on crosses and in the Asian session it can be misleading. VWAP works in forex as an approximation. Use it on EUR/USD and USD/JPY in London and New York, and be sceptical elsewhere.

What is ATR?

Average True Range measures volatility. Each bar's true range is the distance from high to low, extended to include any gap from the previous close, and ATR averages that over a window, usually 14 bars. On the daily chart of GBP/USD an ATR of 90 pips means the pair has been moving about 90 pips a day. It says nothing about direction.

Common settings. 14 periods. Some traders use 20 on the daily chart to smooth it.

What it is good for. Stops and position size. A stop set to a fraction of ATR is a stop sized to how the pair actually moves, rather than to a round number that feels comfortable. Once the stop is in pips, the position size follows: risk divided by stop distance times pip value. The volatility guide covers ATR in detail, and the lot size calculator turns an ATR-based stop into lots at your chosen risk percentage.

Worked example: EUR/USD daily ATR is 70 pips. A swing trader uses a stop of 1.5 ATR, which is 105 pips. Risking 1% of a $20,000 account ($200) with a pip worth $10 per standard lot gives 200 / (105 x 10) = 0.19 lots. If ATR doubles during a volatile month, the same rule halves the size and keeps the cash at risk at $200.

The classic mistake. Using the same stop distance on every pair. A 30 pip stop is generous on EUR/CHF and suicidal on GBP/JPY. ATR exists to stop you doing that.

What are Bollinger Bands?

Bollinger Bands are a 20-period simple moving average with an upper and lower band two standard deviations away. When the market is quiet the bands pinch together; when it moves they expand. Price touching a band is normal, not a signal, since the bands are built to contain about 95% of the action.

Common settings. 20 periods, 2 standard deviations. Rarely worth changing.

What they are good for. Measuring compression. The distance between the bands as a percentage of price, called Bollinger Band Width, falls to a low before many large moves. That is the idea behind a squeeze: volatility is cyclical, and a market that has been unusually quiet is more likely to move hard than one that has just moved. Markets Mastered's squeeze score combines Band Width with ATR percentiles to rank how compressed each instrument is right now.

The classic mistake. Selling the upper band and buying the lower one in a trend. When a market breaks out of a squeeze, price can ride the upper band for days. The bands tell you about volatility, not about reversals.

The five indicators side by side

How many indicators do you need?

Fewer than you think. A trend filter, a volatility measure and one tool for timing cover almost every strategy in this library. Two indicators that measure the same thing, say RSI and a stochastic, do not confirm each other; they agree because they are built from the same inputs, and the agreement means nothing.

A sensible layout for a forex chart: one or two EMAs for direction, ATR in a sub-window for stops, and either RSI or Bollinger Bands depending on whether you trade pullbacks or breakouts. Add the currency strength meter to pick the pairs where a strong currency is matched with a weak one, and the economic calendar to know when none of the indicators will matter for twenty minutes.

Then test it. An indicator setting that looks obvious on last month's chart may have been losing money for a year. The backtesting page explains how to check a rule against real history before you trade it with real money.