Theta Decay Projector
Project an ATM option's value along the √T decay curve — value at key checkpoints and the steep final week.
Formula
ATM extrinsic value decays like the square root of time — half the premium survives to one-quarter of the time. Buyers avoid holding the final two weeks; sellers covet exactly that window. ITM/OTM options decay differently (their extrinsic is smaller to begin with).
Not financial advice — for informational and analytical use only. Verify all figures with a qualified professional before acting on them.
Need theta decay projector results fast? Analysts, founders, traders and finance professionals use the Theta Decay Projector to skip the spreadsheet and get a defensible answer in one step — free, private and instant.
About Theta Decay Projector
Project an ATM option's value along the √T decay curve — value at key checkpoints and the steep final week. ATM extrinsic value decays like the square root of time — half the premium survives to one-quarter of the time. Buyers avoid holding the final two weeks; sellers covet exactly that window. ITM/OTM options decay differently (their extrinsic is smaller to begin with). The governing relationship is V(t) ≈ V₀ × √(DTE/DTE₀) (ATM extrinsic). The Theta Decay Projector 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 Theta Decay Projector
- 1Enter Option premium today, Days to expiry now into the Theta Decay Projector.
- 2The result is computed automatically using V(t) ≈ V₀ × √(DTE/DTE₀) (ATM extrinsic) — there is no button to press.
- 3Change any input to model a different scenario, then copy or share the result.
Why use Theta Decay Projector?
- ✓Computes theta decay projector 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 Theta Decay Projector?+
Theta Decay Projector uses V(t) ≈ V₀ × √(DTE/DTE₀) (ATM extrinsic). ATM extrinsic value decays like the square root of time — half the premium survives to one-quarter of the time. The tool substitutes your actual inputs into this relationship and shows the worked example step by step.
What inputs does the Theta Decay Projector need?+
Enter Option premium today, Days to expiry now and the result updates immediately — there is no button to press. Change any value to model a different scenario in real time.
Is the Theta Decay Projector 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 Theta Decay Projector?+
Buyers avoid holding the final two weeks; sellers covet exactly that window. ITM/OTM options decay differently (their extrinsic is smaller to begin with).
What is the Theta Decay Projector based on?+
The method follows authoritative sources: Natenberg — time decay characteristics. The formula and references are shown on the page so you can verify and cite the result.
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