No login, and nothing you type ever leaves your browser: every number is computed on your device by the same Black-Scholes engine behind the lesson charts. Defaults are the course's canon trade, so the numbers should look familiar.
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Teaching tools, not trade tools. Every output is a Black-Scholes model estimate and will not match live market premiums. Nothing here accounts for the bid-ask spread, brokerage, STT, GST, stamp duty, slippage or your broker's actual margin requirement. Do not size a real position on these numbers alone. Disclaimer, risk and privacy.
Payoff Diagram Builder
Build any multi-leg position and read its expiry P&L in ₹, with breakevens and the worst case marked. The chart is the same one every lesson uses.
Option Price + Greeks Calculator
Black-Scholes fair value with the premium split into intrinsic and time value (Lesson 5), plus the full risk dashboard from Lessons 16 to 18. Interest rate is taken as zero: Lesson 7's rho card explains why that is fine for weeklies.
Fair value ₹165.7 per unit · ₹10,773 per lot (intrinsic ₹0 + time value ₹165.7)
Delta 0.50 (₹32.7/point per lot) · Gamma 0.00096/point · Theta −₹11.8/unit/day (−₹769 per lot) · Vega ₹13.8/unit per IV point
Model outputs, exact to the formula; lessons round these for teaching. Real quotes add the bid-ask toll from Lesson 15.
Probability + Expected Move
The market's one-standard-deviation expected move (Lesson 9) and the model probability of finishing beyond a strike, the same number the delta column approximates (Lesson 17).
Expected move ±415 points: roughly 24,585 to 25,415 (1.7% each way)
Chance of expiring above 25,200 ≈ 31% · below it ≈ 69%
Model probabilities under the market's own IV: odds, never promises. About 1 week in 3 finishes outside the expected move, by construction.
Position Size Calculator
Lesson 30's sizing rule as arithmetic: risk budget from the account, lots from the printed worst case. Never from margin available.
Risk budget ₹10,000 per trade → 2 lots (₹8,450 at risk)
Risk : Reward + Expected Value
The only equation that matters (Lesson 30): win rate × payoffs. Run it before every trade; a high win rate can still be a slow leak.
Expected value −₹650 per trade · risk:reward 1 : 0.33
Breakeven win rate 75%: below this, the strategy loses money whatever it feels like.