Weekly vs Monthly Expiry: A Full Comparison
Weekly and monthly options behave very differently even on the same underlying — this page compares their life, decay speed, gamma profile and typical use cases side by side.
Weekly vs Monthly Expiry: Weekly options are short-lived, cheap and decay fast (high theta, high gamma near expiry) and exist only on Nifty (NSE) and Sensex (BSE); monthly options are longer-lived, cost more, decay more gently until their final week, and exist on every index and stock — including Bank Nifty and FinNifty, which are monthly-only.
Weekly vs monthly, side by side
| Attribute | Weekly expiry | Monthly expiry |
|---|---|---|
| Contract life | Up to about 7 calendar days | Up to about 30–35 calendar days |
| Time value | Small — little time for the underlying to move | Larger — a full month of possible movement priced in |
| Theta (decay) | High and fast throughout the contract's short life | Modest early on, accelerating sharply in the final week |
| Gamma near expiry | Very high — price swings sharply on small index moves | Moderate until the final week, then rises like a weekly |
| Typical cost (premium) | Lower | Higher, for the same strike |
| Which instruments | Only Nifty (NSE) and Sensex (BSE) | Every index and stock, including Bank Nifty & FinNifty (monthly-only) |
| Common use case | Short-term views, event hedges, theta-harvesting income trades | Positional trades, portfolio hedges, rollovers, term-structure reference |
For the deeper mechanics of each, see weekly expiry and monthly expiry.
Why weeklies decay and swing faster
A weekly option packs whatever time value it has into just a few days. With so little time left, theta (daily decay) consumes a large share of that value each day, and — for at-the-money strikes especially — gamma runs high, meaning the option's delta (and price) can swing sharply on even a small index move. This is what makes weekly expiry day feel qualitatively different from an ordinary session. See theta acceleration and gamma risk.
Why monthlies are steadier — until they aren't
A monthly option carries a much bigger cushion of time value, so its decay is gentler and more linear for most of its life, and its gamma stays moderate while there is still weeks to run. But in the final week before expiry, a monthly option starts to behave just like a weekly — decay accelerates and gamma rises — so the caution that applies to weekly expiry day applies equally to a monthly's last few sessions. See the time-decay curve for how this curve is shaped.
When each suits a trader
- Weeklies suit: a view that should play out within days, hedging a specific near-term event (a results date, a policy announcement), or income strategies designed to harvest fast theta with defined risk.
- Monthlies suit: a view that needs weeks to develop, portfolio-level hedges held over a longer horizon, and any instrument — like Bank Nifty or FinNifty — where no weekly alternative exists.
- Neither is inherently "better" — the contract should match the trader's time horizon and risk tolerance. This is educational information, not a recommendation to trade either.
See the expiry cheat sheet for the full instrument-by-instrument expiry-day table, and days-to-expiry to check how much life a given contract has left.
Frequently asked questions
What is the main difference between weekly and monthly options?
Which is cheaper, weekly or monthly options?
Which decays faster, weekly or monthly?
Does every index have weekly options?
Are weekly options riskier than monthly options?
Should I trade weekly or monthly options as a beginner?
Can weekly and monthly options expire on the same day?
Why doesn't Bank Nifty have weekly options anymore?
Last reviewed 11 July 2026. Educational content only — not investment advice.