ATR calculator
Paste high, low and close prices to get the Average True Range (ATR) with Wilder's smoothing, plus suggested stop-loss distances. Works for forex, crypto or shares. Free, no sign-up, nothing leaves your browser.
16 bars read. More history brings the result closer to what charting platforms show. This is a calculator, not advice.
What ATR measures
Average True Range, created by J. Welles Wilder, measures how much a market typically moves in one period, gaps included. It does not say which way prices are heading, only how big the swings are. A rising ATR means the market is getting more volatile; a falling ATR means it is calming down.
Using ATR for stop losses
Many traders set a stop loss a multiple of ATR away from their entry, often 1.5 or 2 times, so normal day-to-day noise is less likely to knock them out. Pairing an ATR-based stop with a position size calculator keeps the money at risk the same even when volatility changes.
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