Calendar Spread Value Estimator
Black-Scholes value of a same-strike calendar at front expiry across spot scenarios — the tent-shaped payoff quantified.
Formula
The calendar profits when spot pins the strike at front expiry — the short front option dies worthless while the back retains time value. It's also long back-month vega, so rising IV widens the tent; collapsing IV after events can sink an otherwise perfect pin.
Not financial advice — for informational and analytical use only. Verify all figures with a qualified professional before acting on them.
Need calendar spread value estimator results fast? Analysts, founders, traders and finance professionals use the Calendar Spread Value Estimator to skip the spreadsheet and get a defensible answer in one step — free, private and instant.
About Calendar Spread Value Estimator
Black-Scholes value of a same-strike calendar at front expiry across spot scenarios — the tent-shaped payoff quantified. The calendar profits when spot pins the strike at front expiry — the short front option dies worthless while the back retains time value. It's also long back-month vega, so rising IV widens the tent; collapsing IV after events can sink an otherwise perfect pin. The governing relationship is value at front expiry = BS(back, T_rem) − intrinsic(front). The Calendar Spread Value Estimator 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 Calendar Spread Value Estimator
- 1Enter Spot price, Shared strike, Back-month IV (%), Front expiry (days), Back expiry (days), Calendar debit paid into the Calendar Spread Value Estimator.
- 2The result is computed automatically using value at front expiry = BS(back, T_rem) − intrinsic(front) — there is no button to press.
- 3Change any input to model a different scenario, then copy or share the result.
Why use Calendar Spread Value Estimator?
- ✓Computes calendar spread value estimator 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 Calendar Spread Value Estimator?+
Calendar Spread Value Estimator uses value at front expiry = BS(back, T_rem) − intrinsic(front). The calendar profits when spot pins the strike at front expiry — the short front option dies worthless while the back retains time value. The tool substitutes your actual inputs into this relationship and shows the worked example step by step.
What inputs does the Calendar Spread Value Estimator need?+
Enter Spot price, Shared strike, Back-month IV (%), Front expiry (days), Back expiry (days), Calendar debit paid and the result updates immediately — there is no button to press. Change any value to model a different scenario in real time.
Is the Calendar Spread Value Estimator 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 Calendar Spread Value Estimator?+
It's also long back-month vega, so rising IV widens the tent; collapsing IV after events can sink an otherwise perfect pin.
What is the Calendar Spread Value Estimator based on?+
The method follows authoritative sources: Natenberg — calendar spreads. The formula and references are shown on the page so you can verify and cite the result.
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