Backtesting: test your trading strategy before you risk real money

How to backtest a trading strategy in 4 steps

1. Choose your dataA market from the library (official daily prices since 1971 for forex, since 1986 for oil) or your own file exported from NinjaTrader, TradingView or MetaTrader, down to 1-minute bars.
2. Write the rulesStart from a template or add conditions: “EMA (20) crosses above EMA (50)”, “RSI (14) is below 30”, “Close crosses above Donchian high (20)”. Combine them with All or Any.
3. Set exits and costsStop loss, take profit (in %, ATR, points or R), trailing stop, time exit, session filter, position size, commission and slippage.
4. Read the resultsNet profit, CAGR, max drawdown, profit factor, win rate, Sharpe ratio, every trade on the chart, monthly returns and a comparison with buy & hold.

9 strategy templates to start from

Each template is a starting point, not a recommendation. Change any rule and press Run again to see the effect.

• EMA crossover 20/50. Trend following: long when the 20 EMA crosses above the 50 EMA, short on the opposite cross.
• Golden cross 50/200. The classic long-term signal: the 50-day average crossing the 200-day average.
• RSI reversal 30/70. Mean reversion: buy when RSI(14) climbs back above 30, exit above 70. Stop at 2 × ATR.
• Bollinger Bands mean reversion. Buy a close back inside the lower band, exit at the middle band. Stop at 2 × ATR.
• Donchian breakout (Turtle 20/10). The Turtle rules: enter on a 20-bar breakout, exit on a 10-bar breakout the other way. Stop at 2 × ATR.
• MACD momentum + 200 EMA. MACD crossing its signal line, only in the direction of the 200 EMA.
• ADX trend pullback. Trend pullback: 20 EMA above 50 EMA, ADX above 25, entry when price crosses back above the 20 EMA.
• Previous-day liquidity sweep (ICT). ICT-style raid: price sweeps the previous day's low and closes back above it. Stop 1.5 × ATR, target 2R, out after 20 bars.
• Custom strategy. Build your own rules: every condition is an indicator, an operator and another indicator or a value.

How to read backtest results

Backtest with your NinjaTrader data, step by step

NinjaTrader 8 can export any historical data saved on your computer to a text file. The backtester reads that file directly, converts the times and recognises the contract.

1. In the NinjaTrader 8 Control Center, open Tools → Historical Data.
2. In the Export section, choose the instrument (for example NQ 12-26), the interval Minute (or Day, or Tick) and the data type Last.
3. Set the start and end dates, click Export and save the .txt file.
4. Drop the file in “Your data file” above. NinjaTrader exports in UTC with end-of-bar times: the backtester switches the bars to their open time and converts them to New York time by default.
5. The contract is read from the file name (NQ, ES, CL, GC…): the point value is filled in from the exchange's contract size. Pick a larger timeframe if you want (5 min, 15 min, 1 h…).

TradingView (Export chart data) and MetaTrader 5 (Symbols → Bars → Export Bars) files work the same way, as does any CSV with date, open, high, low, close columns.

Only data you are allowed to use goes in your file; it never leaves your device.

Backtesting mistakes that make bad strategies look good

• Overfitting. Tuning ten parameters until the curve looks perfect fits the past noise. Keep rules simple and test the same settings on other markets and periods.
• Look-ahead bias. Using information you could not have had at the time. Here a signal is read at the close of a bar and filled at the next open, so the future never leaks into a trade.
• Ignoring costs. Commissions and slippage eat scalping strategies alive. Set them before you trust a result.
• Too few trades. Twenty trades prove nothing. Aim for at least 100 before drawing conclusions.
• One market regime. A trend system tested only on a trending decade will fail in a range. Test bull, bear and sideways periods.
• No out-of-sample test. Build the strategy on one period (for example 2010–2019), then run it unchanged on the next (2020 onwards).

How this backtester simulates your orders

• Signals are evaluated at the close of each bar and filled at the open of the next bar (or at the signal bar's close if you choose it).
• Stops and targets are checked inside each bar with its high and low. When one bar touches both, the stop is counted first (the conservative choice). A gap through the stop fills at the open.
• The trailing stop moves at the close of each bar and applies from the next one. With both directions on, an opposite signal reverses the position at the same price.
• Daily library series contain closing prices only: orders and stops use the close.
• Indicators use all the history available before your start date, so the first trades are not distorted by warm-up periods.
• Results are hypothetical. They do not include financing costs, partial fills or liquidity limits.

From backtest to live trading in NinjaTrader

A good backtest is a filter, not a guarantee. The next step is a forward test: run the same rules in NinjaTrader on a simulation account for a few weeks and compare. Our free NinjaTrader 8 indicators mark the same setups on a live chart — the Turtle Soup and Power of 3 for liquidity raids, and the VWAP and footprint for order flow — and the position size calculator turns your stop into the right number of contracts. Check the economic calendar before each session: news days behave differently from the average day in a backtest.

Good to know

• Past performance does not predict future results: a backtest shows what a set of rules would have done, not what it will do.
• Library markets are daily closing prices; for intraday strategies, use your own data file.
• Forex series are the Federal Reserve's noon buying rates in New York, not exchange settlement prices.
• Information and education only, not investment advice. Trading involves a substantial risk of loss.

Related concepts and tools

• Position size calculatorContracts per trade from your stop and risk.
• Economic calendarThe news that can break a backtest's average day.
• Free NinjaTrader indicatorsICT and order flow tools to trade your setups live.
• Fed Rate MonitorLive FOMC rate probabilities for every 2026–2027 Fed meeting, from regulated market odds and official Fed data.
• COT dataFree CFTC Commitments of Traders data for 44 futures markets: large speculator and commercial net positions, weekly changes, COT index and 3-year charts.
• Trading journalFree trading journal in your browser: import NinjaTrader, MT4/MT5, Tradovate or TradingView trades and get profit factor, Sharpe, drawdown and Monte Carlo odds.
• How to keep a trading journal that actually makes you betterHow to keep a trading journal that improves your results: what to record, daily and weekly reviews, key statistics, Monte Carlo, prop firms and platform exports.

Frequently asked questions

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