Monte Carlo Simulation Calculator for TradingView Strategies
Your TradingView backtest shows incredible profit, but will it survive in live markets?
Most traders rely on Excel or complex Python Monte Carlo simulations to double-check their results. BacktestBase provides an instant, code-free Monte Carlo calculator designed specifically to stress-test your TradingView exports for overfitting.
*Based on Oxford's Significance journal research on backtest overfitting*
Perfect Backtests vs Reality: The Overfitting Trap
The most dangerous strategies are often the "perfect" ones. A backtest showing smooth, consistent profits with minimal drawdowns usually indicates overfitting to historical data rather than genuine edge discovery.
Research indicates that 95% of backtested systematic trading strategies fail in live trading, primarily due to overfitting and unrealistic performance expectations. BacktestBase's Monte Carlo analysis reveals the true performance range when you remove the false precision of perfect historical execution. This strategy appeared robust with only 23% max drawdown, but Monte Carlo stress testing exposed a terrifying reality: 85% drawdown potential when just 12% of trades are missed.
Perfect Backtest Shows
- • Net Profit: +773.42%
- • Max Drawdown: 23.23%
- • CAGR: +10.17%
- • Total Trades: 3,609 executed perfectly
Monte Carlo Reveals
- • Net Profit: +726.70% (6% lower)
- • Max Drawdown: 85.19% (267% higher risk!)
- • CAGR: +9.90% (slight decrease)
- • Trades Skipped: 425 on average (12%)
Why "Perfect" Backtests Are Dangerous
Overfitting Indicators:
- • Too-smooth equity curves
- • Unrealistically low drawdowns
- • Perfect entry/exit timing
- • No missed opportunities
Live Trading Reality:
- • Platform outages miss trades
- • Slippage affects execution
- • Market gaps skip levels
- • Emotions create hesitation
How to Run Monte Carlo Stress Testing
BacktestBase makes institutional-grade Monte Carlo analysis accessible in minutes. Here's how to stress test your TradingView strategy:
Upload your strategy
Export your TradingView backtest as XLSX and upload to BacktestBase
Click "Run Stress Test"
Open your saved strategy and launch the Monte Carlo analysis
Configure parameters
Set simulations (10,000 recommended for statistically valid results) and trade skip percentage (10% simulates missed trades from connectivity issues, market gaps, or execution delays)
Enable Risk of Ruin analysis (optional)
Toggle on Risk of Ruin, set your risk per trade percentage (or let the system derive it from your largest losses), and choose a ruin threshold (25%, 50%, 75%, or 100% account loss). The simulation calculates your probability of hitting that threshold.
Review your results
Get your Robustness Grade (A+ to F), percentile analysis (5th/50th/95th), original vs stressed performance comparison, and if enabled, your Risk of Ruin probability with median trades to ruin.
What happens behind the scenes
The system runs up to 10,000 independent simulations of your strategy. Each simulation randomly skips your chosen percentage of trades and shuffles the execution order to reveal realistic worst-case scenarios that a clean backtest hides. Results are scored on a 30-point robustness scale. When Risk of Ruin is enabled, each simulation also tracks your equity curve using your risk-per-trade setting, counting how many simulations hit your ruin threshold. The output shows your ruin probability (color-coded from green under 5% to red above 50%) and median trades until ruin.
The 30-Point Robustness System
BacktestBase uses an institutional-grade 30-point scoring system that evaluates strategy robustness across multiple risk dimensions. This isn't just another metric—it's a comprehensive framework used by professional fund managers to assess systematic strategies.
The scoring methodology combines established risk metrics from institutional Monte Carlo risk management research. The score combines two critical dimensions: drawdown control (how well the strategy preserves capital under stress) and profit-to-drawdown ratio (whether the returns justify the risk taken). Each dimension is evaluated across the 5th, 50th, and 95th percentiles of Monte Carlo simulations, capturing worst-case, typical, and best-case scenarios.
Understanding the Scoring Breakdown
Absolute Drawdown Score (0-15 points)▼
Points awarded based on maximum drawdown relative to account size:
Applied to 5th, 50th, and 95th percentiles separately (5 points max each = 15 total).
Recovery Factor Score (0-15 points)▼
Points based on Recovery Factor (Net Profit ÷ Max Drawdown):
Applied to 5th, 50th, and 95th percentiles separately (5 points max each = 15 total). A ratio of 3.5 smoothly scores ~4.5 points.
Percentile Averaging (Variance Reduction)▼
Instead of picking a single simulation for each percentile, the system averages simulations within a ±2% range to reduce random variance:
Grade Scale (0-30 points)▼
Final robustness grade based on combined score from both dimensions:
Grade Examples
A Grade: 26/30 Points
Excellent Robustness
A Grade (25-27.9 pts): Excellent robustness across all stress scenarios. Suitable for significant capital allocation.
B Grade: 20/30 Points
Fair Robustness
B Grade (19-21.9 pts): Fair robustness with room for improvement. Acceptable for moderate position sizes with careful monitoring.
C Grade: 14/30 Points
Poor Robustness
C Grade (13-15.9 pts): Poor robustness indicating significant weaknesses. Requires optimization before allocating real capital.
F Grade: 8/30 Points
Failing
F Grade (0-9.9 pts): Failing robustness with high account ruin risk. Do not trade live until significantly optimized or rejected.
Critical Risk Detection
Learning to identify dangerous strategies is crucial for systematic trading success. Here's what to look for when reviewing your Monte Carlo results—the warning signs that separate robust strategies from account killers.
Automatic F Grade (0/30 Points) Override
Critical Override: When the median (50th percentile) maximum drawdown exceeds 100% of your account balance, the strategy receives an automatic F grade with 0/30 points—regardless of other metrics.
Why This Matters: In 50% of stress test scenarios, this strategy would result in catastrophic losses exceeding your entire account balance. No amount of profit potential justifies this level of ruin risk.
Understanding Percentile Analysis
Monte Carlo analysis doesn't give you a single answer—it reveals a range of possible outcomes. The percentile breakdown shows you the statistical distribution of results across 1,000+ simulations. To reduce random sampling variance, BacktestBase uses percentile averaging: instead of picking a single simulation, each percentile averages all simulations within a ±2% range (e.g., the 50th percentile averages simulations from 48% to 52%).
This variance reduction approach aligns with Columbia Business School research on Monte Carlo VaR estimation, where averaging techniques improve the precision of risk measurements at specific confidence levels.
5th Percentile (Worst Case)
Only 5% of simulations perform worse. Use for maximum risk assessment, stop-loss levels, and worst-case position sizing.
50th Percentile (Median)
The most likely outcome—half perform better, half worse. Use for realistic expectations and portfolio allocation. This is the primary metric used for robustness scoring.
95th Percentile (Best Case)
Only 5% of simulations perform better. Use for understanding upside potential while avoiding over-optimism.
Risk of Ruin Analysis
Monte Carlo stress testing includes Risk of Ruin (RoR) analysis—calculating the probability that your account will drop to a defined ruin threshold based on thousands of simulated trading scenarios. You can either enter your actual risk per trade percentage for accurate calculations, or let the system estimate it from your backtest data.
Low probability of account ruin. Strategy shows strong capital preservation across stress scenarios.
Moderate risk requiring attention. Consider reducing position size or improving win rate.
High probability of account ruin. Strategy requires significant optimization before live trading.
Stop Guessing. Start Testing.
Monte Carlo stress testing bridges the gap between theoretical backtests and real-world trading results. By simulating realistic imperfections and measuring robustness across multiple dimensions, you can identify which strategies deserve your capital and which ones will break under pressure.
The institutional-grade 30-point scoring system used by BacktestBase helps systematic traders make data-driven decisions about strategy allocation, risk management, and portfolio construction—all based on rigorous statistical analysis of historical performance characteristics.
Strategy Dashboard with Monte Carlo Integration
BacktestBase strategy management dashboard: Integrated Monte Carlo robustness scoring for systematic strategy evaluation
Standard backtests assume 100% perfect execution—every trade enters and exits at the exact price shown. In live markets, that never happens.
Our Monte Carlo engine simulates skipped trades and shuffled order sequences to show your true "Risk of Ruin"—answering the critical question every trader should ask before going live:
"Is this strategy actually robust, or did I just get lucky with historical data?"
Why Your Backtest Needs a Reality Check
The Problem: Backtest Illusions
Backtests assume perfect execution every time
Single historical path ≠ future reality
Overfitting hides in "profitable" results
Traditional metrics miss tail risks
5-15% of trades missed in live trading
The Solution: Monte Carlo Stress Testing
Simulates 1,000+ market scenarios
Reveals true drawdown probabilities
Exposes overfitting before live trading
30-point confidence scores you can trust
Tests realistic execution scenarios
We created BacktestBase because we saw too many traders launch strategies based on a single backtest path—only to face unexpected drawdowns that destroyed their confidence (and capital). Our Monte Carlo stress testing runs 1,000+ simulations on your actual trade history, revealing the full distribution of outcomes before you risk real money. No spreadsheet formulas to debug, no Python scripts to maintain—just upload your TradingView results and get institutional-grade risk analysis in seconds.
Stop Building Monte Carlo Simulations in Excel
BacktestBase: Institutional Solution
- • Direct TradingView import (30 seconds)
- • 1,000+ validated simulations instantly
- • Professional robustness scoring
- • No coding required
Excel: The Familiar Trap
- • Manual trade data entry prone to errors
- • Complex formulas break with edge cases
- • No standardized methodology
- • Hours spent on each analysis
Python: The Technical Route
- • Requires programming knowledge
- • Weeks of development time
- • Maintaining libraries and dependencies
- • No built-in validation or scoring
| Feature | BacktestBase | Excel | Python |
|---|---|---|---|
| TradingView Import | ✓Drag & drop | ✗Manual entry | ✗Custom parsing |
| Simulation Runs | ✓1,000+ validated | ✗Slow iterations | ✓Unlimited |
| Robustness Scoring | ✓30-point system | ✗None | ✗Build yourself |
| Risk of Ruin | ✓Custom thresholds | ✗Manual formulas | ✗Code yourself |
| Time to Results | ✓2 minutes | ✗Hours | ✗Days/weeks |
| Technical Skills | ✓None required | ✓Basic Excel | ✗Python + stats |
Key Terms: Monte Carlo Glossary
- Monte Carlo Simulation
- A statistical technique that uses random sampling to model the probability of different outcomes. In trading, it simulates thousands of possible equity curves by randomizing trade order and skipping trades to reveal the range of potential results.
- Trade Skip Percentage
- The probability that any individual trade will be randomly excluded from a simulation run. A 10% skip rate means each trade has a 10% chance of being skipped, simulating missed entries due to slippage, platform issues, or human error.
- Robustness Score
- A 0-30 point scale measuring how well a strategy maintains performance under stress. Higher scores indicate the strategy can withstand adverse conditions without catastrophic losses. Calculated from absolute drawdown and profit-to-drawdown ratios across percentiles.
- Percentile Distribution
- Statistical measure showing where a value falls in a dataset. The 5th percentile represents worst-case outcomes (only 5% are worse), 50th is the median (typical outcome), and 95th represents best-case scenarios. Essential for risk assessment.
- Maximum Drawdown
- The largest peak-to-trough decline in account equity during a trading period. Expressed as a percentage, it measures the worst loss from highest point to lowest point. Critical for position sizing and risk management decisions.
- Overfitting
- When a trading strategy is too closely optimized to historical data, capturing noise rather than genuine market patterns. Overfitted strategies show excellent backtest results but fail in live trading because they can't adapt to new market conditions.
- Account Ruin
- The scenario where losses exceed 100% of account equity, effectively wiping out the trading account. Strategies with median Monte Carlo drawdowns exceeding 100% receive automatic 0-point scores due to unacceptable ruin risk.
- Sequence Risk
- The risk that the order of wins and losses affects overall performance. A strategy might survive with wins early but fail if the same losses occur first. Monte Carlo randomizes sequences to test sensitivity to trade order.
- Risk of Ruin (RoR)
- The probability that a trading account will decline to a defined loss threshold (such as 25%, 50%, or 100% drawdown) based on the strategy's statistics and your risk per trade. Unlike robustness scoring which measures consistency, RoR quantifies the specific likelihood of catastrophic account loss under your position sizing.
- Recovery Factor
- A risk-adjusted performance metric calculated as Net Profit divided by Maximum Drawdown. Higher recovery factors indicate better risk-adjusted returns—a strategy that made $10,000 with a $2,000 max drawdown has a recovery factor of 5.0, which is significantly better than making $10,000 with a $5,000 drawdown (recovery factor 2.0). Used in robustness scoring with thresholds at 4.5, 3.0, and 2.0.
Frequently Asked Questions
What is Monte Carlo stress testing in trading?▼
Monte Carlo stress testing runs 1,000+ simulations of your trading strategy by randomly skipping trades and shuffling trade sequences. This reveals the true range of possible outcomes, including worst-case drawdowns that perfect backtests hide. It's used by institutional traders to validate strategy robustness before risking real capital.
Why do 90% of profitable backtests fail in live trading?▼
Research from Oxford's Significance journal shows that backtest overfitting leads to false discoveries in finance. Strategies optimized on historical data often fail live because they assume perfect execution, no missed trades, and optimal timing. Monte Carlo testing simulates realistic imperfections to expose these hidden risks before you trade live.
What is the 30-point robustness scoring system?▼
BacktestBase's 30-point system evaluates strategies across two dimensions: Absolute Drawdown Score (15 points max) based on maximum drawdown thresholds, and Relative Performance Score (15 points max) based on profit-to-drawdown ratios. Grades range from A+ (28-30 points) to F (0-9 points). Strategies with median drawdown exceeding 100% automatically receive 0 points due to account ruin risk.
What do the 5th, 50th, and 95th percentiles mean in Monte Carlo results?▼
The 5th percentile shows worst-case scenarios (only 5% perform worse), the 50th percentile shows the median/most likely outcome, and the 95th percentile shows best-case results. Use the 5th percentile for risk management and position sizing, the 50th for realistic expectations, and avoid over-optimism from the 95th percentile.
How many simulations should I run for reliable Monte Carlo results?▼
For statistically reliable results, run at least 1,000 simulations. Quick assessments can use 500 simulations, while final strategy validation before live trading should use 2,000+ simulations for high confidence. More simulations provide better accuracy but take longer to process.
What trade skip percentage should I use for stress testing?▼
Conservative testing uses 1-5% skip rate (simulates minor execution issues), moderate testing uses 5-15% (realistic platform outages and slippage), and aggressive testing uses 15-50% (worst-case scenario planning). Start with 10% for balanced results that reflect typical live trading conditions.
How do I detect overfitting in my trading strategy?▼
Overfitting indicators include too-smooth equity curves, unrealistically low drawdowns, and perfect backtest results. Monte Carlo testing exposes overfitting by showing dramatic performance degradation when trades are skipped. If your strategy's Monte Carlo median drawdown is 3x higher than the original backtest, it's likely overfitted to historical data.
What robustness grade should I require before live trading?▼
Professional traders typically require a minimum B grade (19+ points) before allocating significant capital. A+ or A grades (25+ points) indicate excellent robustness suitable for larger positions. Any strategy with C grade or below should be optimized or rejected. Never trade strategies with F grades as they indicate high account ruin risk.
How should I integrate Monte Carlo into my workflow?▼
Before live trading: Run 1,000+ simulations with 10% skip rate, require minimum B grade (19+ points), check median performance vs original, validate 5th percentile drawdown tolerance, and set position size based on worst-case scenario. This systematic approach helps identify strategies that are robust enough to deploy with real capital.
How do I construct a portfolio with these scores?▼
Compare robustness scores across strategies, weight allocation by stress test grades, avoid over-concentration in fragile strategies, monitor correlation between stressed results, and rebalance based on ongoing performance. Strategies with higher robustness grades should generally receive larger allocations, while lower-graded strategies should be minimized or excluded.
What is Risk of Ruin and how does it differ from robustness scoring?▼
Risk of Ruin (RoR) calculates the probability of your account dropping to a defined threshold (e.g., 50% loss) based on your risk per trade and strategy statistics. It's a separate calculation from the robustness score—while robustness grades measure consistency and drawdown control across simulations, RoR specifically answers "what's my chance of catastrophic loss?" BacktestBase calculates both to give you complete risk visibility: robustness tells you how stable the strategy is, while RoR tells you the probability of account ruin at your chosen risk level.
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