Concept
Weekly vs Monthly Expiry
Weekly contracts expire each week; monthly contracts run to the monthly expiry date. The difference is remaining time, which changes how premium behaves rather than changing the instrument itself.
How to read it
- Less remaining time means less time value in the premium. A weekly option costs less than a comparable monthly one for that reason alone.
- Decay is proportionally faster in a shorter contract, so the same passage of a day removes a larger share of remaining value.
- Gamma is higher in shorter-dated contracts near the money, meaning Delta shifts faster for a given move in the underlying.
What it does not tell you
- Cheaper is not safer. A lower premium reflects less time for the position to work, not reduced risk.
- Liquidity concentrates in the nearest expiry, so further-dated weeklies can carry wider spreads.
- Which expiries are listed and on what schedule is set by the exchange and has changed several times. Confirm the current listing schedule rather than assuming.
Frequently asked questions
What is the difference between weekly and monthly expiry?
Only the amount of time remaining. That changes how much time value the premium carries and how quickly it decays, but the contract type is the same.
Why are weekly options cheaper?
Because there is less time for the underlying to move before expiry, so the time-value component of the premium is smaller.
Is trading weekly options riskier?
They behave differently: faster decay and higher gamma near expiry mean values change more sharply. Whether that constitutes more risk depends entirely on position size and what is being done, which is not something this page can assess for you.
Which expiry has the most liquidity?
Generally the nearest expiry, with activity thinning in further-dated contracts. This varies by instrument and can change with exchange listing decisions.
Related
- Theta (Time Decay) — Concept
- Vega and Gamma — Concept
- Expiry Day Mechanics — Concept
Educational use only
This page is educational material about how a technical tool is calculated and read. It is not investment advice, not a recommendation to buy or sell anything, and not a signal service. No indicator predicts future prices. CernoQuant is a trading journal and analytics platform, not a SEBI-registered investment adviser. Trading decisions and their outcomes are yours alone.
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