Atr Calculator
Calculate atr with our free Atr Calculator. Compare rates, see projections, and make informed financial decisions. Enter your values for instant results.
Calculator
Adjust values & calculateEnter the ATR value from your charting platform
ATR Multiple Reference (Long Trade)
ATR Details
Formula
True Range captures the full extent of price movement including gaps. ATR averages these True Range values over N periods (typically 14). For stop losses, multiply ATR by a multiplier (1.5x, 2x, etc.) and subtract from entry for longs or add to entry for shorts. This gives dynamic stops that adapt to market volatility.
Last reviewed: December 2025
Worked Examples
Example 1: ATR-Based Stop Loss for EUR/USD
Example 2: ATR Calculation from Candle Data
Background & Theory
The ATR Calculator applies the following established principles and formulas. Foreign exchange markets facilitate the conversion of one currency into another and serve as the largest and most liquid financial markets in the world, with daily turnover exceeding seven trillion US dollars. Exchange rates are quoted as currency pairs, expressing the price of one unit of a base currency in terms of a quote currency. For example, a EUR/USD rate of 1.0850 means one euro buys 1.0850 US dollars. The smallest standardized price movement in most pairs is the pip, typically the fourth decimal place, with a value of 0.0001 per unit for USD-denominated pairs. The bid price is the rate at which a dealer will buy the base currency, while the ask price is the rate at which it will sell. The spread between bid and ask represents the dealer's compensation and varies with liquidity and volatility. Leverage amplifies both gains and losses by allowing traders to control positions larger than their deposited margin. A 100:1 leverage ratio means a one-percent adverse move eliminates the entire margin, making position sizing and risk management critical. Two parity conditions from international economics anchor exchange rate theory. Purchasing Power Parity (PPP) holds that exchange rates should adjust over time so that identical goods trade at equivalent prices across countries: S = P_d / P_f, where S is the spot rate and P_d and P_f are domestic and foreign price levels. PPP performs well over long horizons but poorly in the short run due to trade barriers, non-tradable goods, and capital flows. Covered Interest Rate Parity (CIRP) is a near-arbitrage condition stating that forward exchange rate premiums or discounts exactly offset interest rate differentials between two currencies: F/S = (1 + r_d) / (1 + r_f). Deviations from CIRP create riskless arbitrage opportunities that traders rapidly eliminate. Uncovered Interest Rate Parity posits that high-yielding currencies should depreciate to offset their interest advantage, though empirical evidence is mixed and the carry trade — borrowing in low-rate currencies to invest in high-rate ones — has generated persistent returns.
History
The history behind the ATR Calculator traces back through the following developments. For much of the nineteenth century and early twentieth century, the international monetary system operated under the classical gold standard, under which each participating currency was fixed to a defined weight of gold, making bilateral exchange rates effectively constant. The system provided price stability and facilitated global trade but constrained governments' ability to respond to economic downturns. World War One shattered the gold standard as nations suspended convertibility to finance wartime expenditures. The interwar period saw attempts to restore gold convertibility, most notably the British return to the gold standard in 1925 at the pre-war parity, a decision criticized by John Maynard Keynes as deflationary. The Great Depression forced widespread currency devaluations and the effective collapse of the international gold standard by the early 1930s. The Bretton Woods Conference of July 1944 established a new order in which member currencies were pegged to the US dollar, while the dollar alone was convertible into gold at 35 dollars per troy ounce. The International Monetary Fund and World Bank were created at the same conference to oversee the system. Bretton Woods delivered exchange rate stability during the postwar growth era but came under strain as US deficits and European dollar accumulation outpaced American gold reserves. On August 15, 1971, President Nixon announced the suspension of dollar-gold convertibility — the so-called Nixon Shock — effectively ending the Bretton Woods system. By 1973, major currencies had transitioned to floating exchange rates determined by market supply and demand, a regime that has persisted. On September 16, 1992, hedge fund manager George Soros shorted the British pound against the European Exchange Rate Mechanism constraints, forcing the UK's withdrawal in what became known as Black Wednesday. Electronic trading platforms emerged in the 1990s and 2000s, replacing voice-brokered interbank markets and dramatically reducing transaction costs for institutional and retail participants alike.
Frequently Asked Questions
Formula
TR = max(H−L, |H−Prev Close|, |L−Prev Close|) | ATR = Average of TR over N periods
True Range captures the full extent of price movement including gaps. ATR averages these True Range values over N periods (typically 14). For stop losses, multiply ATR by a multiplier (1.5x, 2x, etc.) and subtract from entry for longs or add to entry for shorts. This gives dynamic stops that adapt to market volatility.
Worked Examples
Example 1: ATR-Based Stop Loss for EUR/USD
Problem: ATR = 0.0050 (50 pips), Entry: 1.1000, 1.5x ATR stop, 2x ATR target.
Solution: SL Distance = 0.0050 × 1.5 = 0.0075 (75 pips)\nTP Distance = 0.0050 × 2.0 = 0.0100 (100 pips)\nLong SL = 1.1000 - 0.0075 = 1.0925\nLong TP = 1.1000 + 0.0100 = 1.1100
Result: Long: SL 1.0925 | TP 1.1100 | RR 1.33:1
Example 2: ATR Calculation from Candle Data
Problem: Given 14 candles of HLC data, calculate ATR and assess volatility.
Solution: True Range for each candle = max(H-L, |H-prevC|, |L-prevC|)\nATR = Average of all True Range values\nVolatility = ATR / Price × 100\nIf ATR% < 0.3% = Low, 0.3-0.7% = Moderate, >0.7% = High
Result: ATR gives adaptive stop loss and take profit levels
Frequently Asked Questions
What is the Average True Range (ATR)?
The Average True Range (ATR) is a technical analysis indicator created by J. Welles Wilder Jr. that measures market volatility. It calculates the average of the True Range over a specified period (typically 14 candles). The True Range for each period is the greatest of: current high minus current low, absolute value of current high minus previous close, or absolute value of current low minus previous close. ATR does not indicate price direction — only the degree of price movement (volatility). A higher ATR means more volatility, while a lower ATR indicates a quieter market.
What is a good ATR multiplier for trading?
Common ATR multipliers: 1.0x ATR is considered tight — may get stopped out by normal volatility. 1.5x ATR is standard — good balance between protection and room to breathe. 2.0x ATR is conservative — gives more room but requires larger account or smaller position size. 3.0x ATR is used for swing trades and longer-term positions. The best multiplier depends on your trading style, timeframe, and pair. Day traders often use 1.0-1.5x ATR, while swing traders use 2.0-3.0x ATR. Test different multipliers in backtesting to find what works for your strategy.
What ATR period should I use?
The standard ATR period is 14, as recommended by its creator Wilder. However, different periods serve different purposes: 7-period ATR is more responsive to recent volatility changes, useful for short-term traders. 14-period ATR is the standard — balanced between responsiveness and smoothness. 20-period ATR is smoother and less reactive to single candle spikes. Longer periods (50-100) show the broader volatility trend. Most traders use 14-period ATR. If you find your stops are getting hit too often, consider increasing the period or the multiplier.
Is my data stored or sent to a server?
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.
Can I use Atr Calculator on a mobile device?
Yes. All calculators on NovaCalculator are fully responsive and work on smartphones, tablets, and desktops. The layout adapts automatically to your screen size.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy