MACD - definition
MACD definition. Explained for Australia forex traders. Plain-English, no jargon. Calculation example included.
Definition: MACD (Moving Average Convergence Divergence) is a trend-following momentum indicator that shows the relationship between two exponential moving averages (EMAs) of a price. It calculates the difference between a fast EMA (12 periods) and a slow EMA (26 periods), then smooths that difference with a signal line (9-period EMA of the MACD line). MACD works best in trending markets but generates false signals in choppy, range-bound conditions.
Formula
MACD Line = 12-period EMA - 26-period EMA
Signal Line = 9-period EMA of MACD Line
Histogram = MACD Line - Signal Line
Example
Assume AUD/USD daily prices: 12-EMA = 0.6750, 26-EMA = 0.6700. MACD Line = 0.6750 - 0.6700 = 0.0050. Next, calculate the 9-period EMA of the MACD Line (e.g., 0.0040) for the Signal Line. Histogram = 0.0050 - 0.0040 = 0.0010. When the MACD Line crosses above the Signal Line, it's a bullish signal for an Australian trader.
Edge cases
- JPY pairs: MACD values for pairs like AUD/JPY often appear as small decimals (e.g., 0.0003) due to JPY's low absolute price, requiring traders to adjust scale or use percentage-based MACD.
- ASIC regulation: Australian brokers under ASIC must use standard 12-26-9 settings; custom periods are allowed but must be disclosed in the trading platform's indicator settings.
- Non-standard conventions: Some platforms calculate MACD using simple moving averages (SMAs) instead of EMAs; always verify the formula in your broker's documentation.
See also
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