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Risk of Ruin Calculator

Risk management tool for traders

See how your win rate and position sizing affect account survival

This risk of ruin calculator helps you estimate the probability of blowing up your account based on your win rate, average reward-to-risk, and risk per trade. A small change in risk can make a huge difference over time.

Lower risk Usually improves long-term survival
Better edge Helps reduce ruin probability
Useful for forex Also works for gold and prop trading
Fast scenario testing Try safer and more aggressive setups

Why this calculator matters

Many traders focus on entries and forget the bigger issue, which is whether their account can actually survive a normal losing streak. That is where a risk of ruin calculator becomes useful. It helps you check whether your current trading approach is sustainable or too aggressive.

The idea is simple. Even a profitable strategy can fail if the risk per trade is too high. On the other hand, a modest but disciplined approach can keep you in the game long enough for your edge to show up.

Tip: If your result looks scary, start by lowering the risk per trade. That is usually the quickest way to improve account survival.
Plan your risk

📘 Risk of Ruin Calculator

Formula used: Pruin = ((1–p) / (p × R))^(1 / f)

🎯 Calculation Results

What it means Enter your numbers and run the calculator.
Safer move A lower risk per trade often improves survival.
Quick note This tool gives a probability estimate, not a promise. It is best used with realistic trading data from your journal.

How to use the calculator well

Use real numbers from your trade history. If your actual win rate is 43% and your average winner is 2 times your average loser, enter those numbers instead of best-case assumptions. That gives you a more honest view of your strategy.

Win rate

This is the percentage of trades that close in profit. A higher win rate can help, but it is not enough on its own.

Win/loss ratio

This shows how large your average winner is compared to your average loser. Strong reward-to-risk can offset a lower win rate.

Risk per trade

This is the percentage of your account you put at risk on each trade. It is often the biggest factor in long-term survival.

Best use case

This calculator is especially useful for forex traders, gold traders, and prop firm traders working with strict drawdown limits.

Sticky note Risking 0.5% to 1% per trade often gives more room to survive losing streaks.
Sticky note A strategy can still be profitable with a lower win rate if the winners are much bigger than the losers.
Sticky note If the result is high, reduce risk first before trying to increase frequency.

Frequently asked questions

What is a risk of ruin calculator?

A risk of ruin calculator estimates the probability of losing enough capital that your trading approach becomes unsustainable. It combines your win rate, reward-to-risk profile, and risk per trade into one risk estimate.

What is considered a good risk of ruin result?

Lower is better. A very low percentage suggests your account has a better chance of surviving normal drawdowns. A high result usually means your strategy, risk size, or both need adjustment.

Why does risk per trade matter so much?

Because aggressive sizing can damage the account quickly during a losing streak. Even a strong strategy can fail if you risk too much on every trade. Reducing position size is often the easiest way to improve survival odds.

Can I use this calculator for forex, gold, and prop firm trading?

Yes. It is very useful for forex pairs, gold trading, indices, and prop firm accounts where drawdown control matters a lot.

Does a low risk of ruin guarantee profits?

No. It simply means the account has a lower probability of failure based on the numbers entered. Profitability still depends on your execution, discipline, and whether your trading edge is real.