ATR Indicator for Futures Trading: Position Sizing and Stop Placement

A 10-point stop in ES can be sensible on one day and far too tight on another. If you use the same stop every time, you are really changing your risk with the market's mood. ATR gives you a way to size both the stop and the position to current conditions, so the dollars at risk stay the same.

What ATR measures

Average True Range averages the True Range over a set number of bars, commonly 14. True Range for a bar is the largest of three values: the current high minus the current low, the current high minus the prior close, and the prior close minus the current low. The last two are what capture gaps. Hypothetical example: a session opens 30 points above the prior close and then trades in a 20-point range that sits above the gap. The high minus the prior close is 50 points, so that bar's True Range is 50, not 20. ATR is the smoothed average of those values. It tells you how much price has been moving recently. It doesn't predict the next move.

Step 1: match the timeframe to the trade

Read ATR on the chart you trade from. A 14-period ATR on a 5-minute chart describes roughly the last 70 minutes of movement, so it reacts quickly to changing conditions. A 14-period ATR on the daily chart describes the last 14 sessions and moves slowly. For intraday entries on 5-minute charts, use the 5-minute ATR. For multi-day holds, use the daily one.

Step 2: choose a multiple

Stop distance = ATR multiple x ATR value. A smaller multiple like 0.5 gives tighter stops and more stop-outs from normal noise. 1.0 gives more room. 1.5 gives still more room, and fits trades you plan to hold through bigger swings. There is no correct multiple in general. If you backtest multiples to choose one, split your data so you aren't picking the multiple that happened to fit one period, and subtract realistic commissions and slippage before judging the result.

Step 3: size the position

Contracts = risk in dollars / (stop distance in points x dollars per point). Use the dollar values for each contract: ES $50 per point, MES $5, NQ $20, MNQ $2.

Hypothetical example: a $50,000 account risking 1% per trade is $500. The 5-minute ATR is 12 points and the multiple is 1.0, so the stop is 12 points.

If ATR rises to 20 points, MES risk per contract becomes $100 and the size drops to 5. ES would be $1,000 per contract, which exceeds the $500 budget at any size. Rounding down matters. Rounding 0.83 up to 1 ES contract would risk $600, 20% above the budget. The scaling works in your favor: as volatility rises, size falls, and dollar risk stays near the budget. Remember that a stop order can slip, so the real loss can be larger than planned in fast markets.

A pre-market volatility check

Before the regular session at 9:30 am ET, compare the overnight range to the 14-day daily ATR. If the overnight range has already used up most or all of the daily ATR, conditions are active and you may want smaller size and wider stops. If the overnight range is small relative to ATR, ranges may be narrow, and the session may be quiet or may expand later. Both readings are context for planning. Neither predicts what the session will do, and I haven't tested the thresholds, so treat them as a prompt to check your assumptions.

ATR and KPL distances

KPLs are fixed reference prices anchored to the regular-session opening print, so the map exists after 9:30 am ET and doesn't move intraday. Once it exists, measuring the distance from price to a level in ATR units is a useful way to scale your expectations. A level 0.3 ATR away is close compared with recent movement. A level 1.5 ATR away would take a move larger than a typical bar range. That tells you about size and stop placement. It doesn't tell you how likely the level is to be reached. The KPL strategy page explains how the levels are built, and the edge calculator is a quick way to check whether your reward-to-risk and win rate assumptions add up before you size anything.

Limits to remember

ATR lags, so a sudden news spike won't be in the number until after the move. Two instruments can have the same ATR in points and very different dollar risk. And ATR-based sizing controls how much you can lose on one trade. It doesn't make the trade a good one.