What Is a Moving Average?
A moving average (MA) is a technical indicator that calculates the average price of an asset over a defined number of periods, creating a smooth line that filters out short-term noise. The two main types are the Simple Moving Average (SMA), which weights all periods equally, and the Exponential Moving Average (EMA), which gives more weight to recent prices.
How Moving Averages Work
Common periods include 20, 50, 100, and 200. The 200-day SMA is widely considered the dividing line between bull and bear markets. When price is above the MA, the trend is bullish. Below the MA, the trend is bearish. Moving averages also act as dynamic support and resistance levels — price often bounces off them during trends.
Key signals include the Golden Cross (50 MA crossing above 200 MA — bullish) and Death Cross (50 MA crossing below 200 MA — bearish).
Why It Matters for Traders
Moving averages are the most widely used indicator in all of finance. They provide objective trend identification, dynamic support/resistance levels, and cross signals. In crypto, the 21 EMA on the daily chart is particularly popular for trend-following, while the 200 SMA on the weekly chart frames multi-year cycle context.
How Perps Traders Use This
For CEX perpetual futures, treat moving average as context around entries, exits, and risk, not as a standalone signal. Pair it with funding, open interest, and liquidation heat so one indicator does not drive the whole book.
Formula and Worked Example
Example numbers only (not a live quote).
If your account equity is $10,000 and you risk 0.5% per idea, the cash risk budget is $50. With a stop 1% away from entry on a linear USDT-margined perp, notional size is about $5,000 before leverage optics. Size from stop distance first, then pick leverage that fits the margin mode.
Common Mistakes
- Treating a single print of moving average as a trade signal without checking funding, open interest, and your liquidation price.
- Mixing venue conventions (coin-margined vs USDT-margined, cross vs isolated) and reading the wrong mark.
- Copying example numbers from a glossary into live size without checking the current book depth and fee schedule.
- Ignoring related terms that change the meaning of the print on a given day.
