---
title: "What the Greeks Measure"
type: "lesson"
topic: "Futures & Options (Indian markets)"
level: "Intermediate"
read_minutes: 8
slug: "greeks-intro"
url: "https://learn-derivatives.tapetide.com/learn/greeks-intro"
markdown_url: "https://learn-derivatives.tapetide.com/learn/greeks-intro.md"
source: "DeltaDesk by Tapetide"
license: "Educational use — attribute DeltaDesk (Tapetide)"
---

# What the Greeks Measure

> **In plain English:** Don't let the scary names fool you — the 'Greeks' are just five dials on a dashboard. Each one tells you how your option's price will react to one thing: the market moving, time passing, or fear rising. Like a car dashboard shows speed and fuel, the Greeks show what's driving your option's value right now.

The Greeks sound intimidating but each one answers a simple question: "if X changes by a little, how much does my option price change?" They are sensitivities — nothing more.

## Delta — sensitivity to price

Delta is how much the option price moves for a 1-point move in the underlying. A 0.5 delta call gains ₹0.5 per point. Delta also doubles as a rough probability of finishing in-the-money, and tells you your effective directional exposure (a 0.5-delta call behaves like half a futures lot).

## Gamma — how delta itself changes

Gamma measures how fast delta changes as the underlying moves. High gamma means your directional exposure shifts quickly — great for buyers near a breakout, dangerous for sellers because losses accelerate. Gamma is highest at-the-money and explodes near expiry.

## Theta — the cost of time

Theta is how much value the option loses each calendar day, all else equal. It is negative for buyers (you pay rent on time) and positive for sellers (you collect it). Theta accelerates as expiry approaches — the famous decay curve.

## Vega — sensitivity to volatility

Vega is how much the price moves for a 1% change in implied volatility. Buyers are long vega (they profit if IV rises); sellers are short vega. An options position can be right on direction and still lose money if IV collapses — the "IV crush" after an event.

> **Tip:** In the Greeks Explorer, slide IV and watch vega-heavy ATM options swing while deep ITM/OTM options barely move.

## Rho — sensitivity to rates

Rho is the price change per 1% change in interest rates. For the short-dated options most retail traders use, rho is a rounding error — worth knowing exists, rarely worth trading around.

**Check your understanding:** You sold an at-the-money NIFTY straddle for a juicy theta. Overnight, IV jumps from 12% to 18% even though the market barely moves. What just happened to your position?

- A. You profited — sellers always win on volatility moves
- B. Nothing — IV doesn't affect P/L without a price move
- C. You're down on vega — short straddles are short volatility
- D. Only your delta changed

**Answer:** C. You're down on vega — short straddles are short volatility — A short straddle is short vega — when IV rises, the options you sold become more expensive to buy back, so you take a mark-to-market loss even if spot is unchanged. This is the 'right view, wrong vega' trap.

> **Key takeaway:** Key takeaway: Delta = direction, Gamma = acceleration, Theta = time, Vega = volatility, Rho = rates. A position is the sum of its legs’ Greeks.

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**Learn this interactively at [DeltaDesk](https://learn-derivatives.tapetide.com/learn/greeks-intro)** — payoff builders, live Greeks and real NSE data.

*Educational content only — nothing here is investment advice. Derivatives carry significant risk of loss. Tapetide is not a SEBI-registered research analyst or investment adviser.*