# Option Simulator — StockMojo > Historical options backtesting with multi-leg strategy support - Live page: https://stockmojo.in/simulator - Content last updated: 2026-07-05 - Platform: StockMojo — free options analytics for Indian markets (NSE F&O) This is a machine-readable markdown mirror of the live tool page. The live page shows real-time NSE data during market hours (09:15-15:30 IST) and supports 200+ F&O symbols via per-symbol URLs like https://stockmojo.in/simulator/banknifty. ## Frequently asked questions ### What is an option simulator? An option simulator lets you practice and backtest option trading on real historical data without risking real capital. You construct a position — single-leg or multi-leg — pick a date, and the simulator replays the actual NSE option prices that traded then so you can see exactly how the strategy would have performed. StockMojo's option simulator covers Nifty, Bank Nifty, FinNifty and F&O stock options, using actual traded prices rather than theoretical estimates. ### What is option backtesting and how does it work? Option backtesting is the process of testing a strategy against historical option chain data to measure how it would have performed. The simulator stores per-strike, per-expiry option prices for past sessions; when you run a backtest it reconstructs your position at the entry date using the prices that actually traded, then simulates each following session and computes daily P&L. The output is the same series of trades you would have taken had the strategy been live at the time. ### How is option backtesting different from paper trading? Paper trading is forward-looking: you place virtual trades against live prices and wait days or weeks for the result. Option backtesting is backward-looking: you run dozens of historical date ranges in minutes and immediately see the distribution of outcomes for your strategy. Both have value — paper trading tests execution and discipline, while backtesting tests whether the strategy itself has a statistical edge. ### Which indices and stocks can I backtest? You can backtest option strategies on Nifty, Bank Nifty, FinNifty and all major NSE F&O stocks, across multiple years of weekly and monthly expiries. Each session is reconstructed from actual NSE option price snapshots, so simulated fills match what the live market would have offered at the time of day you specify. The same strategy behaves differently on each underlying, so always backtest on the one you actually trade. ### What option strategies can I backtest? The simulator supports any combination of long and short calls and puts, across any strike and expiry in the historical data — single-leg directional trades, vertical spreads, iron condors, iron flies, butterflies, straddles, strangles, calendar spreads and ratio spreads. You can layer additional legs or roll positions mid-trade, and the payoff chart updates live as you build. ### Can I backtest intraday option strategies? Yes. The simulator supports intraday backtesting with minute-level data. You can simulate buying options at the open and exiting at different times through the day to test scalping, momentum and expiry-day strategies — for example, selling the ATM straddle at 9:30 AM on a past Thursday and stepping forward to see exactly how the premium decayed against your stop-loss. ### How accurate are backtested P&L results versus live trading? Backtested P&L is highly accurate for strategies that don't need precise mid-price fills — credit spreads, iron condors, straddles and any held-to-expiry strategy match live results within a small slippage assumption. Tight intraday scalps and high-frequency adjustments are harder to simulate exactly because real-world bid-ask spreads and slippage matter more, so add a realistic cost buffer when testing those. ### Can I backtest adjustments and rolls? Yes. You can close or roll any leg mid-trade and the simulator uses the historical prices at the adjustment date. This lets you backtest dynamic management rules — for example, rolling a short strike when delta exceeds a threshold, or booking a position at 50% of maximum profit — and see whether the adjustment actually improved the outcome. ### What metrics should I track when backtesting a strategy? For each backtest, track total P&L, the daily P&L curve, maximum drawdown, max profit, max loss, breakeven points and win rate across multiple runs. Expectancy — the average rupee outcome per trade — is the single number that says whether an edge is real. Test across at least 20–30 varied sessions, including trending, ranging and event-driven days, so the pattern reflects real conditions rather than a lucky sample. ### Is the option simulator free to use? Yes, the core features of the option simulator are completely free. You can load historical option chain data for Nifty, Bank Nifty, FinNifty and F&O stocks to practice and backtest your strategies without any charges, and basic use needs no signup. ## How to backtest an option strategy with the Option Simulator 1. **Pick the underlying and date** — Select Nifty, Bank Nifty, FinNifty or any F&O stock and choose the historical entry date for your backtest. 2. **Choose the expiry** — Pick the weekly or monthly expiry your strategy trades — expiry choice drives theta and gamma, so match what you actually run. 3. **Construct your position** — Add legs one at a time — pick the strike, expiry and quantity for each call or put. The payoff chart updates live as you build. 4. **Replay the session** — Run the simulation to replay historical prices forward from your entry. The tool computes daily P&L until expiry or your defined exit, including behaviour at your stop-loss and target. 5. **Review the P&L curve and metrics** — Examine max profit, max loss, breakeven, drawdown and the daily P&L curve to judge whether the strategy fit the historical regime. 6. **Iterate across many dates** — Re-run with different strikes, dates and mid-trade adjustments across 20–50 sessions to confirm the strategy is robust before risking real capital. ## Related tools - [Strategy Builder](https://stockmojo.in/strategy-builder) — markdown: https://stockmojo.in/strategy-builder.md - [Option Chain](https://stockmojo.in/option-chain) — markdown: https://stockmojo.in/option-chain.md - [Historical Chart](https://stockmojo.in/historical-chart) — markdown: https://stockmojo.in/historical-chart.md ## Glossary Terms used: option-simulator, option-backtesting, paper-trading, straddle, implied-volatility. Definitions: https://stockmojo.in/glossary