In the previous topic we learned how MA crossovers signal trend changes.
MACD — Moving Average Convergence Divergence — takes this concept further by adding a momentum dimension to the crossover signal.
Developed by Gerald Appel in the 1970s — MACD remains one of the most popular and versatile indicators in trading.
MACD consists of three components displayed below the price chart:
MACD Line
The difference between the 12-period EMA and 26-period EMA.
MACD Line = 12 EMA – 26 EMA
When MACD line is positive — 12 EMA is above 26 EMA — bullish momentum.
When MACD line is negative — 12 EMA is below 26 EMA — bearish momentum.
Signal Line
A 9-period EMA of the MACD line itself.
Smoother and slower than the MACD line.
Used to generate crossover signals.
Histogram
The difference between MACD line and Signal line.
Displayed as bars above or below zero.
Shows momentum strength visually.
Growing histogram bars = momentum increasing.
Shrinking histogram bars = momentum fading.
Bullish crossover:
MACD line crosses ABOVE the Signal line.
Short term momentum accelerating upward.
Buy signal.
Bearish crossover:
MACD line crosses BELOW the Signal line.
Short term momentum accelerating downward.
Sell signal.
Most reliable crossovers:
Occur when MACD is significantly below zero — deeply oversold.
Bullish crossover from deeply negative territory = strong momentum shift.
Least reliable crossovers:
Frequent crossovers near the zero line in choppy markets.
Generate many false signals.
The zero line is one of the most underused aspects of MACD.
MACD above zero:
12 EMA above 26 EMA.
Bullish momentum dominant.
Only take bullish crossover signals.
MACD below zero:
12 EMA below 26 EMA.
Bearish momentum dominant.
Only take bearish crossover signals.
Using the zero line as a filter dramatically reduces false signals.
Only trade bullish MACD crossovers when MACD is above zero.
Only trade bearish MACD crossovers when MACD is below zero.
Divergence is when price and MACD move in opposite directions.
This is widely considered the most powerful use of MACD.
Bullish Divergence:
Price makes a lower low — new price low.
MACD makes a higher low — momentum not confirming the new low.
Meaning: Price is falling but momentum is improving. Sellers are losing power. Reversal likely upward.
Example:
Bitcoin price falls from $20,000 to $18,000 — new low.
MACD low is higher than previous low.
Divergence signals selling momentum exhausting.
Price reverses upward.
Bearish Divergence:
Price makes a higher high — new price high.
MACD makes a lower high — momentum not confirming the new high.
Meaning: Price rising but momentum fading. Buyers losing power. Reversal likely downward.
Trading Divergence:
The histogram provides early warning signals before the MACD line crosses.
Histogram shrinking:
Bars getting smaller — momentum fading.
Potential crossover coming.
Early warning to prepare for signal.
Histogram growing:
Bars getting larger — momentum strengthening.
Current trend has energy.
Continue in trend direction.
Histogram crosses zero:
MACD line and Signal line have crossed.
Confirms the crossover signal.
Default settings: 12, 26, 9
These are the standard settings used by most traders.
Faster settings: 8, 17, 9
More responsive — more signals — more false signals.
Used by shorter term traders.
Slower settings: 19, 39, 9
Less responsive — fewer signals — more reliable.
Used by longer term traders.
Start with default 12, 26, 9 settings. Only change if you have a specific reason backed by testing.
Lagging indicator:
MACD is based on moving averages — which are themselves lagging.
By the time MACD signals — price may have already moved significantly.
False signals in sideways markets:
Like all trend indicators — MACD generates many false crossover signals in ranging markets.
Solution:
Combine MACD with support and resistance and trend analysis.
Only trade MACD signals that align with the larger trend context.
| Feature | MA Crossover | MACD |
|---|---|---|
| Components | 2 MAs | MACD line + Signal + Histogram |
| Speed | Depends on periods | Medium |
| Momentum info | No | Yes — histogram |
| Divergence | No | Yes — powerful signal |
| Complexity | Simple | Moderate |
MACD provides more information than simple crossovers — particularly the histogram and divergence signals.
In the next topic we will study Bollinger Bands — a volatility indicator that reveals when markets are about to make big moves.