Options Concepts
Option Greeks
Explained
The Greeks tell you why an option's price moves — direction, time, volatility and more. Master these five and option pricing stops being a black box.
The five forces on an option's price
An option premium changes for several reasons at once. The Greeks isolate each one, so you can see exactly what's helping or hurting your position.
| Greek | Measures sensitivity to… | In one line |
|---|---|---|
| Delta (Δ) | Underlying price | How much the option moves per 1-point move |
| Gamma (Γ) | Delta itself | How fast delta changes — acceleration |
| Theta (Θ) | Time | Daily value lost to time decay |
| Vega (V) | Implied volatility | Change per 1% move in IV |
| Rho (ρ) | Interest rates | Change per 1% rate move (usually small) |
How they interact
- Delta & gamma are a pair: delta is your directional exposure, gamma is how quickly that exposure shifts as price moves (highest at the money, near expiry).
- Theta & vega are the cost of being long an option: you bleed theta daily and you're exposed to vega if IV falls. Sellers collect theta and are short vega.
- Rho rounds out the set but rarely drives short-dated trades.
Using the Greeks in practice
- Buying options? You want a big, fast move (positive delta/gamma) to outrun theta and stable-or-rising IV (positive vega).
- Selling options? You want price to stall (collect theta) and IV to fall (short vega) — while watching gamma risk near expiry.
- Event coming up? Expect IV to inflate before and crush after — a vega trap for naive buyers.
Calculate the Greeks live
TradePulse's Black-Scholes Greeks calculator shows delta, gamma, theta, vega and rho — and how each behaves as conditions change.