Parabolic SAR explained for forex and gold

The Parabolic SAR is the row of dots you see above or below price on many trading platforms. It answers a single question: if the current trend is still intact, where should my stop be today? When price touches a dot, the indicator flips to the other side and the trend is treated as over.

This guide explains how the Parabolic SAR is calculated, what the acceleration factor does, how to read it on EUR/USD and gold, and where it fails. Every chart uses real daily data, and the flip statistics come from our own calculation on the last 12 months of prices. If you want to see trailing stops used on real trades, follow the Forexuro Telegram channel.

What the Parabolic SAR is

SAR stands for stop and reverse. J. Welles Wilder Jr. introduced the tool in his 1978 book New Concepts in Technical Trading Systems, the same book that gave traders the RSI, the ATR and the ADX. Wilder designed it as a complete system: you are always in the market, either long or short, and the SAR level is both your stop and the point where you reverse.

Few traders use it that way today. Most treat it as a trend filter and a trailing stop guide. When the dots sit below price, the indicator is in long mode. When they sit above, it is in short mode. The word parabolic describes the path of the dots in a strong trend: they start slowly and then speed up, curving towards price.

How the calculation works

Each day's SAR is built from the previous day's value. The formula is: next SAR = current SAR + AF multiplied by (EP minus current SAR).

• EP, the extreme point, is the highest high of the current up move or the lowest low of the current down move.
• AF, the acceleration factor, starts at 0.02 and rises by 0.02 every time a new extreme point is made, up to a maximum of 0.20.
• In an uptrend, the SAR is never placed above the two previous lows. In a downtrend, it is never placed below the two previous highs.
• When price crosses the SAR, the indicator flips. The new SAR is set at the old extreme point and the AF resets to 0.02.

The practical effect is simple. Early in a trend the stop trails slowly and gives the move room. As the trend makes fresh highs or lows, the AF grows and the stop closes in faster, so a late, stretched move is protected tightly.

Reading the dots on a chart

You do not need to calculate anything by hand, because every major platform plots the indicator. What you do need is to read three things correctly.

First, the side of the dots tells you the mode. Second, the gap between the dots and price tells you how much room the current trend has before it is declared over. Third, the spacing between one dot and the next tells you how fast the stop is accelerating. Widely spaced dots that are racing towards price mean the AF is close to its maximum and a flip may be near, even if price is still moving in your favour.

A flip is not a forecast. It only means price has crossed a level that a mechanical rule set. Treat it as information about the trend you were in, not as a reason to open a trade the other way.

Parabolic SAR on EUR/USD

The chart below shows EUR/USD daily bars since May with the standard settings. Green dots are long mode and red dots are short mode.

Two patterns stand out. During the steady fall from mid September to mid October the red dots stayed above price for about a month, and anyone using them as a stop would have stayed short through the whole move. During choppier stretches in the summer the dots flipped every week or two, and each flip arrived after part of the move had already gone.

On our calculation the indicator turned to long mode on 14 October and was still long at Friday's close of about 1.1204, with the SAR near 1.1148. Our EUR/USD pair page explains what moves the pair day to day.

Parabolic SAR on gold

Gold moves far more in dollar terms than a currency pair, but the indicator adapts automatically because it is built from the market's own highs and lows.

The August rally shows the indicator at its best: the green dots trailed under a strong move and kept the trader in until the trend broke. The weeks either side show its weakness, with short runs that flipped soon after starting. At Friday's close the indicator was in short mode, with the SAR near $4,218 against a futures close of about $4,008. That gap of more than $200 shows how far a SAR based stop can sit from price after a sharp drop, which is a point to weigh before you copy one onto a live gold position. Our XAU/USD signals page covers how gold behaves in each session.

How often the SAR flips

To give a sense of how noisy the indicator is, we counted the flips on daily bars over the 12 months to 23 October 2026 for four markets, using the default settings.

EUR/USD flipped 19 times, GBP/USD 21 times, USD/JPY 23 times and gold 20 times. The median run between flips was 14 bars on EUR/USD and 10 bars on the other three. The longest runs were 31 bars on EUR/USD and 29 on gold. In other words, a typical signal lasted around two weeks, and only a handful became the long, smooth trends the indicator is designed to catch. Those few runs are where most of its value comes from.

Changing the step and the maximum

The two inputs control sensitivity. A smaller step and maximum make the stop trail more slowly, which means fewer flips and more room. Larger values do the opposite.

We tested this on the same 12 months. With a step of 0.01 and a maximum of 0.1, EUR/USD flipped 13 times and gold 10 times. With the defaults it was 19 and 20. With a step of 0.04 and a maximum of 0.4, the count jumped to 33 and 32. Halving the settings roughly halved the number of flips on gold, at the cost of later exits and larger give backs when a trend did end.

There is no correct setting. A swing trader holding for weeks may prefer slower values. Someone using four hour charts may keep the defaults and accept more flips. Whatever you choose, test it on past data before you rely on it.

Using the SAR as a trailing stop

This is the most common use. Once a trade is in profit, you move your stop to the SAR level at the end of each bar, but only in the direction of the trade. The stop never moves backwards.

The appeal is that it removes guesswork. The weakness is that the SAR does not know about structure. It can place a stop just above a round number or just below an obvious swing low, where many other stops sit. A sensible compromise is to use the SAR as a guide and then adjust the stop slightly beyond the nearest clear level. Our trailing stops and breakeven guide covers other trailing methods, and the trailing stop glossary entry defines the term.

Pairing the SAR with a trend filter

Because the SAR is always in a trade, it produces losing flips in ranges. The fix is to add a filter that tells you whether a trend exists at all.

The ADX indicator is the classic partner, and Wilder designed both. A common approach is to act on SAR flips only when the ADX is above a chosen level, often 20 or 25, and to ignore them when it is below. A simpler filter is a moving average: take long mode signals only when price is above, say, the 50 day average, and short mode signals only when it is below. Our trends and moving averages lesson explains moving averages, and the Ichimoku cloud offers another way to define the trend.

Sizing a trade from the SAR distance

The distance between price and the SAR changes every day, so the risk on a trade changes too. If you enter with the SAR as your initial stop, measure the distance in pips or dollars and size the position from that, not from a fixed lot.

For example, if your risk limit is 1% of the account and the SAR sits 60 pips away on EUR/USD, the lot size will be very different from a day when it sits 25 pips away. The position size calculator does the arithmetic once you enter the account size, risk percentage and stop distance. The ATR stop loss guide shows a different way to set stop distance based on volatility.

Common mistakes with the Parabolic SAR

• Opening a new trade on every flip, which means trading every range and paying for every false start.
• Using the SAR in a sideways market without a trend filter.
• Moving a stop backwards when the indicator flips against the trade.
• Copying a daily SAR level onto a lower timeframe trade, or the reverse.
• Ignoring the gap: a SAR far from price can mean a stop much wider than your risk plan allows.
• Changing the settings after every losing trade until the past looks perfect.

Parabolic SAR checklist

• Confirm a trend exists with a filter such as the ADX or a moving average before acting on a flip.
• Read the side of the dots, the distance to price and the spacing between dots.
• Decide whether the SAR is your entry trigger, your stop, or only a trend guide, and stick to it.
• Adjust the stop to sit beyond the nearest obvious level rather than on top of it.
• Size the trade from the actual stop distance.
• Check the economic calendar, because a major release can jump straight through any trailing stop.
• Record each trade so you can see whether the settings suit the market you trade.

Where to go next

The Parabolic SAR is a good teacher. It forces you to define where a trend ends before the trade starts, and it shows clearly how much a trailing stop gives back when a trend fails. If you want a structured path through indicators, risk and trade management, the Forexuro trading course covers them in order, from the basics to building a complete plan.

If you prefer to follow ready made ideas, our forex signals give every trade an entry, a stop loss and three targets, and you can check our published results. The Forexuro team has more than 10 years of trading experience, and we post market notes daily on the free Telegram channel.

Official sources

Primary reference pages from regulators, central banks and official bodies on the topics in this article.

• BIS: Triennial Central Bank Survey of foreign exchange markets, 2025, the global data on foreign exchange turnover by currency and trading centre.
• LBMA Gold Price, the London benchmark price for gold in US dollars per troy ounce.
• FCA: permanent restrictions on the sale of CFDs to retail consumers, the UK leverage limits, margin close-out rule, negative balance protection and risk warnings for retail CFD trading.

Frequently asked questions

Keep reading

ADX indicator explained · ATR for stop losses · Trailing stops and breakeven · Risk management for traders