What is Risk of Ruin Formula?
Classic ruin approximations combine win probability, loss probability, and risk per trade to estimate account failure odds.
Formula
RoR = ((1 − A) / (1 + A))^N
Indian market context (NSE)
Reference levels: Nifty 50 at 24,300, Reliance Industries at ₹1,300, Bank Nifty futures at 55,000 (lot size 30). Examples below show how Risk of Ruin Formula shows up on Indian index, equity, and futures books — update to live quotes in your journal.
Nifty 50 perspective
Risk of Ruin Formula on Nifty (24,300): define rupee risk per trade before the 9:15 open; index gaps on global cues can skip planned risk of ruin formula levels — use exchange-supported stop types and size for gap beyond stop.
Reliance Industries perspective
Risk of Ruin Formula for Reliance (₹1,300): stock circuits and 20% band limits can trap positions past your planned exit; keep risk of ruin formula outside circuit freeze zones where possible.
Bank Nifty futures perspective
Risk of Ruin Formula on Bank Nifty (55,000): span margin changes intraday — a valid risk of ruin formula at entry may be too large after a margin hike; recheck buying power before adding lots.
How to validate
- Validate Risk of Ruin Formula with a written rule and at least 20 tagged examples.
- Ask whether the reading changed because of process or one outlier trade.
- Compare two independent time windows before adjusting position size.
- Document validation date in weekly review notes.
How to track in TradeLyser
- Mention Risk of Ruin Formula in trade comments when it influenced the decision.
- Mirror the term in weekly review questions for consistency.
- Filter trades mentioning the concept during monthly analytics.
- Cross-link to related glossary terms in mentor notes.
Best practices
- Teach Risk of Ruin Formula the same way to mentors and peers — shared vocabulary.
- Re-read this page after major rule changes to Risk of Ruin Formula usage.
- Prefer one improvement per month over ten simultaneous tweaks.
- Link learn articles when Risk of Ruin Formula needs deeper study.
Common pitfalls
- Using Risk of Ruin Formula buzzwords without measurable journal tags.
- Copying another trader’s Risk of Ruin Formula rule without sample size context.
- Skipping weekly review because the term feels “basic”.
- Letting social media redefine Risk of Ruin Formula mid-quarter.
How to use this in TradeLyser
Plug tag stats into formula yearly; cap risk % if ruin odds exceed your tolerance.
Related terms
The Kelly criterion suggests the fraction of capital to risk when you know win rate and payoff ratio. Full Kelly is aggressive; most traders use a fraction to reduce ruin risk.
Maximum drawdown records the worst fall from a prior equity high to the subsequent low. It describes pain and capital required to stay in the game — not just the final P&L.
Position sizing translates account risk into quantity. With a ₹2,000 risk cap and ₹40 stop per share, size is 50 shares — before lot multiples on F&O.
Risk of ruin models chance of hitting ruin given win rate, payoff, and risk per trade.
FAQ
Exact formula which variant?
Document source — Ralph Vince vs others differ.
Ruin formula for correlated trades?
Assumes independence — discount for correlation.
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