ATR for Futures Traders: Sizing Stops and Contracts by Volatility

A stop that looks sensible on a chart can be too tight for the market you are trading that day. ATR, the Average True Range, gives you a number for that problem. It measures how far a market has typically traveled per bar, in points, so you can size a stop to actual movement instead of a round number that felt comfortable.

J. Welles Wilder introduced it in his 1978 book New Concepts in Technical Trading Systems. It says nothing about direction. It measures volatility, and volatility feeds three decisions: stop distance, target distance and contract count.

How ATR is calculated

For each bar, True Range is the largest of three values: the current high minus the current low, the absolute value of the current high minus the prior close, and the absolute value of the current low minus the prior close. The second and third values capture gaps, where price opens away from the last close and a plain high-low range would understate the move.

ATR then averages True Range over N bars. Wilder used 14 bars with his own smoothing: new ATR equals the prior ATR times 13, plus the current True Range, all divided by 14. Most platforms default to ATR(14), but check whether yours uses Wilder smoothing or a simple average. The two give slightly different numbers, and you want the same version every time you size a trade.

ATR is also tied to the chart timeframe. ATR(14) on a daily chart describes daily travel. ATR(14) on a 5-minute chart describes how far a single 5-minute bar usually moves. Match the ATR to the timeframe you actually trade.

Converting ATR into dollars

Point values are fixed by the contract: ES is $50 per point, MES $5, NQ $20 and MNQ $2. Multiply ATR in points by the point value and you get the dollar volatility of one contract. The ATR figures below are hypothetical, so read your own off the chart.

Setting a stop from ATR

The method is simple: stop distance equals a multiplier times ATR on your trading timeframe. The multiplier is a choice you test, not a constant. A hypothetical example on a 5-minute chart: ATR(14) reads 3 points on ES, and you choose 1.5 times ATR. That is 4.5 points, which is already tick-aligned since ES moves in 0.25 increments. The dollar risk is 4.5 x $50 = $225 per ES contract, or $22.50 per MES.

Do not apply a daily ATR multiplier to a scalp. Half of a 60-point daily ATR is a 30-point stop, and that only makes sense for a trade you plan to hold for hours. If you keep getting stopped out and price then goes your way, measure your stop against the ATR of the chart you trade. A stop under about half an ATR sits inside ordinary bar-to-bar movement. Widening it is only half the fix, because the wider stop has to come with smaller size.

Sizing contracts from the stop

Contracts equal your dollar risk divided by (stop in points x point value), rounded down. Hypothetical account of $50,000 risking 1%, which is $500:

• Scalp, 4.5-point stop on MES: $22.50 per contract, so 500 divided by 22.50 is 22.2, round down to 22 MES.
• Swing, 30-point stop on ES: $1,500 per contract, so 500 divided by 1,500 is 0.33. One ES risks three times your budget. Three MES risk $450, which fits.

Round down, never up. Also remember that a stop order can slip, so realized loss on a fast move can exceed the number you computed. Margin is collateral, not a cap on loss. Your risk comes from the stop and the size, as covered in the position sizing guide.

Targets and where KPL fits

ATR is useful as a sanity check on a target. If daily ATR is 60 points and your intraday plan needs 180, you are asking for three times the typical daily travel, and there should be a specific reason in the setup. ATR measures past movement. It does not forecast the next bar.

It pairs well with fixed reference prices. YMI's KPL are fixed levels anchored to the regular-session opening print, with four levels on the standard ES/NQ map. They are reference prices, not predicted ones, and they do not move intraday. Once the open is printed, you can express the distance from your entry to the nearest KPL in ATR units. If that level is 12 points away and 5-minute ATR is 3, the move you need is four ATRs, which tells you quickly whether a 1.5-ATR stop gives the trade a sensible shape. The KPL strategy page explains how the levels are built.

Reading ATR as a volatility gauge

When ATR is rising, the same stop in points buys less safety, and a stop sized in ATR gets wider, which means fewer contracts for the same dollar risk. That is the mechanism behind trading smaller around high-volatility events like Federal Reserve announcements. When ATR compresses, stops can tighten, but a tight stop that survives only because the market is quiet will fail when volatility returns.

A cheap way to test your own settings

1. Log your last 30 or more trades with the ATR value at entry and your stop distance.
2. Divide stop distance by ATR for each trade.
3. Mark which trades stopped out and then reached your original target.
4. Compare the stop-to-ATR ratio of those trades against your other trades.

That sample is small, so treat the result as a hint about your own habits rather than proof of anything. It costs nothing but an hour with a spreadsheet, and it often shows that stops were sized by feel.

Related reading: how to set stop losses and support and resistance levels. If you want the course and daily ES/NQ KPL workflow to practice sizing against, start the 7-day trial, then Intro is $97/month.