How to Read RSI and MACD (Without Overthinking It)
Open almost any trading chart and you'll see two indicators under the price: RSI and MACD. Both are "momentum" indicators. They don't predict the future; they summarize how price has been moving recently. Here's what they mean.
RSI: Relative Strength Index
RSI was introduced by technical analyst J. Welles Wilder in his 1978 book New Concepts in Technical Trading Systems. It compares the size of recent up-moves to recent down-moves and squeezes the result onto a scale from 0 to 100. The most common setting looks back 14 periods (14 days on a daily chart, 14 hours on an hourly chart).
- Above 70: traditionally called "overbought": price has risen fast relative to recent history.
- Below 30: traditionally called "oversold": price has fallen fast.
- Around 50: roughly balanced momentum.
Traders also watch for divergence: for example, price makes a new high but RSI makes a lower high, hinting that upward momentum is fading.
MACD: Moving Average Convergence/Divergence
MACD was created by Gerald Appel in the late 1970s. It's built from moving averages:
- MACD line = 12-period exponential moving average (EMA) minus the 26-period EMA.
- Signal line = 9-period EMA of the MACD line.
- Histogram = MACD line minus signal line (the bars).
How it's typically read:
- MACD crosses above the signal line: short-term momentum turning up.
- MACD crosses below the signal line: momentum turning down.
- MACD above / below zero: the short-term average is above / below the longer-term average, a rough read on trend direction.
- Growing vs. shrinking histogram bars: momentum strengthening or fading.
Using them together
Because both are calculated from past prices, they lag. Many traders use them as a checklist rather than a trigger, for example: is the trend up (MACD above zero), and has the price cooled off (RSI back near 40 to 50) rather than spiking (RSI above 70)? Even then, news and sudden sentiment shifts, which are common with meme coins, can override any indicator.
Key takeaways
- RSI measures speed of recent moves on a 0 to 100 scale; 70/30 are guidelines, not rules.
- MACD tracks the gap between a fast and slow moving average; crossovers signal momentum shifts.
- Both lag price. Use them for context, and always pair them with a risk plan like a stop-loss.