Options Greeks explained simply

The "Greeks" measure how an option's price responds to different forces. You do not need the maths to trade, but understanding what each one tells you makes strategies like the Iron Condor and short strangle far easier to manage.

The four that matter most

For most options traders, four Greeks do the heavy lifting:

• Delta — how much the option price moves per ₹1 move in the underlying; also a rough probability of finishing in-the-money. A 25-delta short is ~75% likely to expire worthless.
• Gamma — how fast delta itself changes. Gamma is highest near expiry and at ATM, which is why expiry-day moves feel violent for sellers.
• Theta — time decay. Premium sellers want theta on their side: every day that passes, an OTM option loses a little value.
• Vega — sensitivity to implied volatility. A volatility spike inflates option prices, hurting sellers even if the spot has not moved.

Why sellers watch delta and theta

Premium-selling strategies are long theta (they profit from decay) and short gamma and vega (they suffer from big moves and vol spikes). Picking short strikes by delta is a way to standardise risk: a 16- or 25-delta short is a consistent distance in probability terms regardless of the current volatility.

Greeks in practice on KXalgo

KXalgo can place strikes by target delta (vol-adaptive) instead of fixed points, and surfaces position context so you can manage with the Greeks in mind. The backtester prices legs with Black-Scholes, the same model the Greeks come from.