Volatility position sizing in gold trading
Volatility position sizing sets lot size from gold's current volatility, usually ATR, so each trade risks a similar amount whether gold is quiet or wild.
Also called ATR position sizing, Volatility-adjusted sizing, Risk parity sizing
Volatility position sizing links the size of a position to how much the market is moving. The stop is set as a multiple of ATR, and lots are calculated so that the stop equals a fixed amount of risk. When volatility doubles, the stop widens and the size halves.
How it applies to gold trading
Gold’s daily range can double between a quiet summer week and a week with CPI and FOMC. A fixed stop would be hit by noise in the busy week and be too wide in the quiet one. Volatility sizing keeps the stop proportional to the market and the dollar risk constant. The formula is lots = risk in dollars ÷ (k × ATR × 100), where k is the ATR multiple and 100 is the contract size in ounces.
The method underpins many trend-following systems and is a natural fit for swing trading on daily ATR. Its weakness is that ATR looks back, so it lags when volatility jumps suddenly on news.
Worked example
Example (hypothetical numbers): account $20,000, risk 0.75% = $150. Daily ATR(14) is $40 and the stop is 1.5 × ATR = $60. Lots = 150 ÷ (60 × 100) = 0.025, rounded down to 0.02. A month later ATR is $25: stop $37.50, lots = 150 ÷ 3,750 = 0.04.
A common mistake
Using a volatility stop but keeping the same lot size. The method only works if the size changes with the stop.
See also: ATR, ATR multiple, Position sizing, Fixed lot sizing.
Frequently asked questions
How do I size a gold trade using ATR?
Set the stop at a multiple of ATR, then divide your dollar risk by the stop distance times the contract size. For 100-ounce lots, lots = risk ÷ (stop × 100).
Which ATR period should I use?
Fourteen periods is the common default. Use the ATR of the timeframe you trade: hourly for intraday, daily for swing trades.