Risk Reversal (25Δ Skew) Calculator
25-delta risk reversal and butterfly from wing IVs — the two numbers that summarize an entire vol smile.
Formula
Equity smiles slope down (puts rich) since 1987; FX quotes entire surfaces as ATM + RR + fly. A steepening negative RR means crash insurance is being bid — often a better fear gauge than the VIX level itself.
Not financial advice — for informational and analytical use only. Verify all figures with a qualified professional before acting on them.
Need risk reversal calculator results fast? Analysts, founders, traders and finance professionals use the Risk Reversal Calculator to skip the spreadsheet and get a defensible answer in one step — free, private and instant.
About Risk Reversal (25Δ Skew) Calculator
25-delta risk reversal and butterfly from wing IVs — the two numbers that summarize an entire vol smile. Equity smiles slope down (puts rich) since 1987; FX quotes entire surfaces as ATM + RR + fly. A steepening negative RR means crash insurance is being bid — often a better fear gauge than the VIX level itself. The governing relationship is RR = IV_call(25Δ) − IV_put(25Δ); fly = wings avg − ATM. The Risk Reversal 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 Risk Reversal (25Δ Skew) Calculator
- 1Enter 25Δ put IV (%), ATM IV (%), 25Δ call IV (%) into the Risk Reversal Calculator.
- 2The result is computed automatically using RR = IV_call(25Δ) − IV_put(25Δ); fly = wings avg − ATM — there is no button to press.
- 3Change any input to model a different scenario, then copy or share the result.
Why use Risk Reversal (25Δ Skew) Calculator?
- ✓Computes risk reversal 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 Risk Reversal Calculator?+
Risk Reversal Calculator uses RR = IV_call(25Δ) − IV_put(25Δ); fly = wings avg − ATM. Equity smiles slope down (puts rich) since 1987; FX quotes entire surfaces as ATM + RR + fly. The tool substitutes your actual inputs into this relationship and shows the worked example step by step.
What inputs does the Risk Reversal Calculator need?+
Enter 25Δ put IV (%), ATM IV (%), 25Δ call IV (%) and the result updates immediately — there is no button to press. Change any value to model a different scenario in real time.
Is the Risk Reversal 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 Risk Reversal Calculator?+
A steepening negative RR means crash insurance is being bid — often a better fear gauge than the VIX level itself.
What is the Risk Reversal Calculator based on?+
The method follows authoritative sources: Gatheral, The Volatility Surface — smile parameterization. The formula and references are shown on the page so you can verify and cite the result.
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