What is an EMA (exponential moving average)?
In one line: An EMA, or exponential moving average, is an average of recent prices that gives the newest candles more weight, so it reacts faster than a simple average.
How it works
A simple average treats every candle the same. An EMA leans on the most recent ones.
Each new EMA value is the old EMA, nudged toward the latest close. The nudge size is a "multiplier":
Multiplier = 2 ÷ (number of candles + 1)
For a 9-candle EMA: 2 ÷ 10 = 0.2.
A simple example
Yesterday's 9-candle EMA was 100. Today's close is 105.
New EMA = old EMA + 0.2 × (close − old EMA) = 100 + 0.2 × (105 − 100) = 100 + 1 = 101.
A 9-candle simple average might have moved only about 0.6 on the same day. The EMA moved further because the newest close counts more.
Why it matters
Because it reacts faster, an EMA hugs price more closely. It turns sooner when the trend turns.
Common settings:
- 9 or 20 EMA: short-term direction.
- 50 EMA: medium-term.
- 200 EMA: the long-term trend many traders watch.
In a clean Trend, price often pulls back to a short EMA and bounces. Some traders use that as a place to look for a setup, together with a level from the chart. More in moving averages explained.
A common mistake
Trading every EMA cross. When two EMAs cross in a sideways market, they can flip back and forth all day. Each cross looks like a signal. Most are noise.
Check whether the market is trending at all before trusting a cross. The last turning points will tell you.
Faster isn't always better. An EMA reacts sooner to real turns and to fake ones.
Questions
Is EMA better than SMA?
Neither is better everywhere. The EMA reacts faster; the SMA is steadier. See EMA vs SMA for when each fits.
What EMA do day traders use?
Short ones like the 9 and 20 are common on intraday charts, often next to VWAP. There's no single correct setting.
Does the EMA predict price?
No. It's built from past closes, so it always lags a little. It shows direction, not the future.
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