Free Trading Master Tool

Risk of Ruin Calculator for Trading

Stress-test whether your risk per trade can survive normal losing streaks. The calculator estimates the chance of hitting a chosen drawdown threshold from consecutive losses inside a planned sample of trades.

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Estimated win rate (%)

Risk per trade (% of account)

Drawdown threshold (%)

Planned sample size (trades)

Losing-streak stress test

Calculating…

Chance of at least one drawdown-sized losing streak in the sample.

Formula uses independent-trade losing-streak probability as an educational approximation.

Educational tool only. Real markets are not independent coin flips; this does not predict future results and is not financial advice.

Why this matters

A trading plan can look acceptable on one setup, but fail when several losses arrive together. Risk of ruin thinking keeps the focus on survival, risk controls and process review instead of emotional position-size changes.

How to use it safely

Use journaled win-rate data by setup, not guesses.
Test conservative assumptions before increasing risk.
Lower risk per trade if normal losing streaks threaten your drawdown limit.
Combine this with expectancy, risk-reward and trade review rules.

Risk of ruin formula used here

This page converts your drawdown threshold into the number of consecutive losses that would approximately reach it. It then estimates the probability of seeing at least one losing streak of that length during your planned trade sample.

The approximation is intentionally simple because the goal is decision hygiene: understand how quickly drawdown risk rises when risk per trade is too large, win rate is unstable or the trade sample is small.

Where Trading Master fits

Trading Master connects this calculator to a broader education framework: setup selection, market structure, technical analysis, risk management, psychology, journaling and execution review. The number is only useful when it leads to clearer rules.

Related Trading Master tools

Position Sizing Mistakes Trading Expectancy Calculator Trading Drawdown Calculator Risk Reward Calculator Forex Position Size Calculator Risk Management Worksheet Trading E-Book

Frequently asked questions

Is this a full professional risk-of-ruin model?

No. It is a practical losing-streak approximation for education. A complete model would need payoff distribution, changing position size, correlation, slippage and strategy regime changes.

Does a low result mean a strategy is safe?

No. A low streak probability does not guarantee safety. It only means this specific input set is less exposed to this specific losing-streak threshold.

Does Trading Master provide signals or investment advice?

No. Trading Master is educational content only. It does not provide financial advice, trading signals or profit guarantees.