Wilder's Moving Average (RMA) Indicator Explained

Wilder's Moving Average (RMA) is the smoothing Welles Wilder built for his indicators — it's the engine inside RSI and ATR. Mathematically it's an EMA with a gentler smoothing constant: an RMA of length 14 behaves like an EMA of length 27.

How It Works

• Each bar blends 1/N of the new value with (N−1)/N of the previous average.
• The result is steadier than an EMA of the same stated length — roughly half the speed.
• Because RSI and ATR use it internally, RMA-based rules stay stylistically consistent with them.

How to Trade It

Use RMA where you want EMA logic with more patience: slower baselines, calmer slope filters, or smoothing custom oscillators in the Indicators Lab. If an EMA system whipsaws, swapping the same length to RMA is the two-second experiment.

Building It in Setup.Cash

Add Wilder's Moving Average (RMA) in the strategy builder — the length input controls its sensitivity — and use its value in any entry, exit, or filter condition. You can also combine it with other tools in the Indicators Lab or via the AI indicator generator. See the moving averages primer for how the families compare. For the full category overview, see the advanced trend library guide.

Trend tools reward patience: pick one, pair it with a volatility or regime filter, and backtest before trading it live.