RSI measures momentum on a 0–100 scale, MACD tracks the gap between two moving averages to show trend momentum and its turns, ATR measures how far price typically moves per candle, and EMA is a moving average weighted toward recent prices. Together they answer four questions: which way, how strongly, how wildly, and is it changing.
Each indicator is a summary of price—never new information. They help you see what’s already on the chart more clearly. Here is each one, then how they fit together.
The four at a glance
| Indicator | Measures | Default setting | Main question it answers |
|---|---|---|---|
| EMA | Trend direction | 20, 50, 200 | Which way is the market going? |
| RSI | Momentum | 14 periods | How strong is the current push? |
| MACD | Trend momentum and shifts | 12, 26, 9 | Is the trend gaining or losing steam? |
| ATR | Volatility | 14 periods | How much does price normally move? |
EMA: exponential moving average
What it is
An average of closing prices that gives more weight to recent candles. The weighting factor is k = 2 ÷ (N + 1). For a 20 EMA, k = 2 ÷ 21 ≈ 0.095.
EMA today = (close − EMA yesterday) × k + EMA yesterday
Example: yesterday’s 20 EMA is $100.00, today closes at $104.00. EMA = (104 − 100) × 0.095 + 100 = $100.38. The EMA moves toward price, but only partly—that’s the smoothing.
How to read it
- Price above a rising EMA: uptrend. Below a falling EMA: downtrend.
- 20 EMA: short-term trend; pullbacks to it are common in strong trends.
- 50 EMA: medium-term trend; a frequent dynamic support or resistance.
- 200 EMA: long-term trend; widely watched on the daily chart.
- Crossovers: 50 crossing above 200 is often called a “golden cross”, below a “death cross”. They lag by design—the move is usually well underway.
Common misread
Treating every touch of an EMA as a bounce. In a range, price crosses the EMA back and forth constantly; EMAs only behave like support or resistance when there’s a trend.
RSI: relative strength index
What it is
RSI compares the average size of up-closes with the average size of down-closes over 14 periods.
RSI = 100 − 100 ÷ (1 + RS), where RS = average gain ÷ average loss.
Example: over 14 periods, average gain = $1.20, average loss = $0.80. RS = 1.5. RSI = 100 − 100 ÷ 2.5 = 60.
How to read it
| RSI zone | Usual reading |
|---|---|
| Above 70 | Strong upward momentum (“overbought”) |
| 50–70 | Bullish momentum |
| 30–50 | Bearish momentum |
| Below 30 | Strong downward momentum (“oversold”) |
- Trend context changes the zones. In uptrends, RSI often oscillates between 40 and 80; in downtrends, between 20 and 60.
- Divergence: price makes a higher high, RSI makes a lower high. Momentum is fading. This is a warning, not a timing tool—divergences can persist for several swings.
Common misread
Selling because RSI is above 70. “Overbought” in a strong trend can last weeks. It’s more useful as a flag to tighten risk or avoid chasing than as an entry trigger.
MACD: moving average convergence divergence
What it is
Three components:
- MACD line = 12 EMA − 26 EMA
- Signal line = 9-period EMA of the MACD line
- Histogram = MACD line − signal line
Example: 12 EMA = $105.40, 26 EMA = $103.90 → MACD = 1.50. Signal = 1.10 → histogram = +0.40.
How to read it
- MACD above zero: the short-term average is above the long-term one—bullish trend momentum. Below zero: bearish.
- MACD crossing the signal line: momentum shift. Crosses above zero carry more weight than crosses deep below it (and vice versa).
- Histogram shrinking: momentum fading even if the trend continues. Often the earliest visible change.
- Divergence: like RSI, a price high not confirmed by a MACD high signals weakening.
Common misread
Trading every signal-line cross. In a sideways market, MACD crosses repeatedly and generates whipsaws. Check that price is actually trending (EMAs sloped, structure of higher highs or lower lows) before trusting crosses.
ATR: average true range
What it is
The average of the “true range” over 14 periods. True range is the largest of:
- high − low
- |high − previous close|
- |low − previous close|
Example: today’s high $52, low $50, previous close $49. Values: 2, 3, 1 → true range = $3 (the gap from $49 counts).
How to read it
ATR has no direction. It tells you the normal size of a candle.
- Stops: place them beyond the structural level plus a buffer of 0.5–1.5 ATR, so noise doesn’t take you out. See the position sizing guide.
- Targets: a target 10 ATR away on a short timeframe is optimistic; 2–4 ATR is more typical for a single swing.
- Regime: rising ATR means expanding volatility (often during breakouts and selloffs); falling ATR means compression, which often precedes a breakout from a symmetrical triangle or flag.
Common misread
Using a fixed dollar stop on every market. A $2 stop on a stock with a $0.80 ATR is wide; on one with a $4 ATR it’s inside the noise.
How the four combine
Each indicator answers a different question, so they complement rather than duplicate each other. RSI and MACD both measure momentum—using both mostly confirms the same thing twice. EMA (trend) and ATR (volatility) add genuinely different information.
A simple framework:
- EMA sets the bias. Price above a rising 50 EMA: look for longs. Below a falling one: look for shorts or stand aside.
- Price structure sets the levels. Support and resistance decide entry, stop and target.
- RSI or MACD times it. Look for momentum turning back in the trend direction—RSI recovering from 40–45 in an uptrend, or the MACD histogram turning positive after a pullback.
- ATR sizes it. The stop buffer and target realism come from ATR.
A worked example
Daily chart of a stock:
- Price $82, above a rising 50 EMA at $78. Bias: long.
- Pullback to support at $80–$80.60, which also sits near the 20 EMA.
- RSI dipped to 44 and turned up to 51. MACD histogram shrinking negatives, about to flip positive. Momentum turning back up.
- A bullish engulfing prints at the zone.
- ATR = $1.60.
Plan: entry $82, stop = $80 − 0.5 × $1.60 = $79.20, risk $2.80. Next resistance at $88.40 → reward $6.40, R:R ≈ 2.3:1. With a $20,000 account at 1% risk ($200), size = $200 ÷ $2.80 ≈ 71 shares. Check the ratio with the risk/reward calculator.
What would invalidate it? A daily close below $79.20, RSI failing back below 40, or MACD crossing down below zero.
Do settings change by timeframe?
Mostly no. The defaults are period counts, not durations, so a 14-period RSI on a daily chart covers about three trading weeks while on a 1-hour chart it covers 14 hours. That automatic scaling is why the same settings work across timeframes. What does change is interpretation: on lower timeframes, readings flip more often and extremes mean less. If you adjust anything, do it once, for a reason you can write down, and keep it fixed long enough to judge the result in your journal.
Mistakes to avoid
- Indicator stacking. Five momentum oscillators agreeing is one opinion, five times.
- Optimizing settings to fit the past. An RSI of 9 that “worked” last month is curve-fitting. Defaults are shared reference points.
- Ignoring the timeframe. A daily RSI of 75 and a 15-minute RSI of 25 can coexist.
- Using indicators instead of levels. Indicators lag price; levels are where decisions happen.
Indicators in a scan
When SnapPulse reads a chart image, it explains RSI, MACD, ATR and EMA in plain language alongside the detected pattern and key levels—what each says about that specific setup, not just the values. The Coach can then answer follow-ups like “why does the ATR matter for this stop?”. It’s a practical way to learn the indicators on charts you actually trade.
To keep building the foundation, read how to read candlestick charts and risk/reward explained.
Educational content — not financial advice.
