EMA (Exponential Moving Average)

A simple moving average (SMA) adds up the last N closes and divides by N, so every bar counts the same. An EMA gives each new price more weight than the one before it, so the line hugs price and reacts to a real move sooner. The cost is more false signals in choppy trade.

The formula: multiplier = 2 ÷ (period + 1), then EMA = (price × multiplier) + (previous EMA × (1 − multiplier)). For a 20 period EMA the multiplier is about 0.095, so the newest bar carries roughly 9.5 percent of the weight. The first value is seeded with a simple average, and your platform updates the rest on every bar.

Reading it: price above a rising EMA favors longs, price below a falling EMA favors shorts, and a flat EMA with price crossing back and forth means no trend. Several EMAs stacked in order (9 above 20 above 50) confirm a strong trend.

Common setups are the 9 and 20 EMA crossover, the EMA bounce (buying the first pullback to a rising 20 EMA), pairing an EMA with VWAP so both agree on direction, and the 50 and 200 cross on higher timeframes, known as the golden cross and death cross. Day traders mostly use the 9, 20 and 50; swing traders the 20, 50 and 100; position traders the 50 and 200.

On a prop account an EMA filter mainly keeps you out of trades against the trend, which protects the daily loss limit. The usual mistakes are piling on too many EMAs, trading crossovers in a range, entering on the exact cross instead of the pullback, and trusting the line without a stop.