Option Gamma Calculator
Gamma and how much delta will change for a chosen spot move — the curvature risk of your option book.
Formula
Gamma is largest at the money and explodes near expiry — a 14-day ATM option re-hedges constantly. Long gamma profits from movement but bleeds theta; short gamma collects theta and prays for stillness.
Not financial advice — for informational and analytical use only. Verify all figures with a qualified professional before acting on them.
Need option gamma calculator results fast? Analysts, founders, traders and finance professionals use the Option Gamma Calculator to skip the spreadsheet and get a defensible answer in one step — free, private and instant.
About Option Gamma Calculator
Gamma and how much delta will change for a chosen spot move — the curvature risk of your option book. Gamma is largest at the money and explodes near expiry — a 14-day ATM option re-hedges constantly. Long gamma profits from movement but bleeds theta; short gamma collects theta and prays for stillness. The governing relationship is Γ = φ(d₁) / (S·σ·√T); Δ_new ≈ Δ + Γ·ΔS. The Option Gamma Calculator computes entirely in your browser — free, private (your figures never leave your device) and instant, recalculating live as you change any input.
How to use Option Gamma Calculator
- 1Enter Spot price, Strike price, Implied volatility (%), Risk-free rate (%), Days to expiry, Spot move to test (currency) into the Option Gamma Calculator.
- 2The result is computed automatically using Γ = φ(d₁) / (S·σ·√T); Δ_new ≈ Δ + Γ·ΔS — there is no button to press.
- 3Change any input to model a different scenario, then copy or share the result.
Why use Option Gamma Calculator?
- ✓Computes option gamma calculator instantly with the correct formula — no spreadsheet needed
- ✓100% free and unlimited, with no sign-up, login or paywall
- ✓Runs entirely in your browser, so the figures you enter stay private
- ✓Shows the formula, a live worked example and references so you can defend the number
Frequently asked questions
What is the formula behind the Option Gamma Calculator?+
Option Gamma Calculator uses Γ = φ(d₁) / (S·σ·√T); Δ_new ≈ Δ + Γ·ΔS. Gamma is largest at the money and explodes near expiry — a 14-day ATM option re-hedges constantly. The tool substitutes your actual inputs into this relationship and shows the worked example step by step.
What inputs does the Option Gamma Calculator need?+
Enter Spot price, Strike price, Implied volatility (%), Risk-free rate (%), Days to expiry, Spot move to test (currency) and the result updates immediately — there is no button to press. Change any value to model a different scenario in real time.
Is the Option Gamma Calculator free, and is my data private?+
Yes — it is completely free with no sign-up or usage limit, and it runs entirely in your browser, so the numbers you enter are never uploaded or stored on any server. It is for informational and analytical use, not financial advice.
What should I watch out for when using the Option Gamma Calculator?+
Long gamma profits from movement but bleeds theta; short gamma collects theta and prays for stillness.
What is the Option Gamma Calculator based on?+
The method follows authoritative sources: Natenberg, Option Volatility and Pricing — gamma. The formula and references are shown on the page so you can verify and cite the result.
Related Finance tools
Human Life Value (HLV) Calculator
The economic value of your future earnings to your family — the income-replacement basis for sizing a life-insurance cover.
● LiveTerm Life Insurance Coverage Calculator
How much term-life cover you actually need — replacing income, clearing debts and funding goals, net of existing assets and cover.
● LiveDIME Method Life Insurance Calculator
The DIME formula — Debt + Income + Mortgage + Education — a fast, complete way to size a life-insurance cover.
● Live