Weekly vs Monthly Options: Expiries and Tool Limits

Weekly vs monthly options differ in when their contracts end, the time remaining and the risk held until exit. On NSE, Nifty has weekly options; Bank Nifty, FinNifty and Midcap Nifty no longer do. Monthly contracts remain available under their specifications. Compare actual listed contracts and quotes. This tool’s Theta and Annualized labels are simple premium ratios: they do not calculate option Greeks [measures of option price sensitivity] or predict returns.

Which NSE contracts can you actually compare?

As checked on 15 October 2026, NSE lists Nifty weekly expiries on Tuesday and monthly expiries on the last Tuesday, with expiry moved to the previous trading day when that Tuesday is a trading holiday. Check the listed contract date rather than counting weekdays yourself.

NSE/FAOP/64506, dated 10 October 2024, ended Bank Nifty, Midcap Nifty and FinNifty weekly series, with final weekly expiries in November 2024. NSE/FAOP/68747, dated 25 June 2025, set revised Tuesday expiries for contracts expiring from September 2025, subject to its transition arrangements. A discontinued weekly series cannot be created by entering a premium in this calculator.

The weekly series excludes the monthly-expiry week under the current contract specifications. A monthly option can have very little time left if bought close to its expiry. The words weekly and monthly therefore do not reliably tell you the remaining days of the two contracts you are comparing.

Quick answer: weekly vs monthly options for buyers and sellers

There is no single winner. The two expiries suit different holding periods and different tolerance for fast moves. The table gives the general picture. It describes how the contracts behave, not what you should trade.

For a buyer, the question is whether your view can be proved right before the contract runs out. A cheap weekly premium looks attractive, but it needs the move to arrive on time. For a seller, a high premium per day comes with a bigger risk of a large loss on a sudden move. Neither side gets a better result just from the label. Position size, strike, stop and exit rules matter far more.

Which Indian indices have weekly expiry today

Only one index on each exchange has weekly options now. The rest are monthly only. The standing weekdays below follow the exchanges' rules in force on the check date, so always confirm the date of the listed contract, because a trading holiday moves an expiry to the previous trading day.

If you read an older blog that says Nifty expires on Thursday or that Bank Nifty has weekly expiry, it is out of date. Nifty's weekly expiry has been Tuesday since 1 September 2025. The calculator above has no way to check that a weekly contract exists, so it is up to you to compare real, listed contracts.

Expiry changes the exposure, rather than deciding a winner

A contract that expires sooner leaves less time before its expiry outcome is determined. A longer-dated contract extends exposure to price and volatility changes. Neither label establishes a suitable position size, likely profit, liquidity or the right holding period for a particular trader.

Theta [sensitivity to time passing] estimates how the option premium changes when time passes while the other pricing factors stay unchanged. The Options Industry Council explains that time decay is not linear. Dividing a premium by the remaining days cannot reproduce that sensitivity.

Gamma [change in price sensitivity] describes how delta [premium sensitivity to underlying moves] changes as the underlying price moves. Near-expiry, near-the-money options can have particularly high gamma. These sensitivities depend on the actual contract and conditions, rather than the weekly or monthly label alone.

Liquidity [ability to trade readily] also needs contract-level evidence. Compare the bid, ask and available quantities at the strike and expiry you intend to trade. This form has no order-book input and cannot establish that either maturity offers an easier entry or exit.

Why weekly options lose value so fast in the last days

An option's price has two parts. One is intrinsic value, which is what you would get if you exercised it now. The other is time value, which is the market's price for the chance that things change before expiry. Time value shrinks as the end date nears, and it does not shrink in a straight line. The Options Industry Council explains that decay speeds up as expiry approaches.

This is why a weekly contract in its last day or two looks so different from a monthly contract with the same strike. The weekly contract has almost no time left, so a small move in the index can change its premium by a large share. The monthly contract with several weeks left loses time value more gently. The key point for a buyer is that the underlying has to move in your favour by enough, and soon enough, to beat the premium lost to the passing of days. When a monthly contract reaches its own final week, it behaves like a weekly one.

That is also why this tool's premium-per-day number is only a rough average. Real decay is uneven, so the last day usually takes a bigger share than the first.

What the comparison form accepts

• Current Spot Price: the underlying level used as the base for the Annualized arithmetic.
• Strike Price: the contract’s exercise price. Match the strike across the two quotes for a same-strike comparison.
• Weekly Option Premium and Monthly Option Premium: quoted per-unit prices from contracts that actually exist.
• Days to Weekly Expiry and Days to Monthly Expiry: positive time inputs measured on the same basis.
• Option Type: Call or Put. The visible premium-per-day ratios do not change their formula with this choice.
• Lot Size: units per lot. The visible ratios do not scale up with the entered lot quantity.

The form has no actual expiry-date picker, implied-volatility field, bid-ask input or trade-direction selector. It does not retrieve current premiums, confirm matching quote times or validate listed contracts. A positive time shorter than one day is treated as a full day, so it cannot model the final hours accurately. Blank or zero day entries substitute stored defaults.

Worked example: reproduce the ratios, then interpret them carefully

For this fictional Nifty comparison, use Spot and Strike of 25,000, weekly premium ₹120 with 4 days remaining, and monthly premium ₹300 with 20 days remaining. Choose Call and enter the verified 65-unit NIFTY lot shown in NSE’s October through December 2026 market-lot columns. The prices and days are assumptions, rather than live quotes.

The card called Weekly Theta is 120 ÷ 4 = ₹30 per day per quoted premium unit. Monthly Theta is 300 ÷ 20 = ₹15 on the same basis. These are average premium-per-day amounts. The formula description mentions a square root, but the visible cards actually divide by days directly.

Premium Ratio = 300 ÷ 120 = 2.5x, meaning the assumed monthly premium is that multiple of the weekly premium. Weekly Annualized = (120 ÷ 25,000) × (365 ÷ 4) × 100 = 43.80%. Monthly Annualized uses the same formula with 300 and 20, producing 21.90%.

For a separate cost check, multiplying these fictional premiums by 65 gives ₹7,800 for the weekly lot and ₹19,500 for the monthly lot before charges. Those full-lot amounts are not the visible Theta cards. Compare actual rupee exposure as well as the ratios.

Why Annualized cannot rank buyer or seller profits

The tool’s percentage base is the underlying spot level. It is neither the buyer’s premium outlay nor the seller’s actual margin. Repeating premium-to-spot arithmetic across a year does not account for closing losses, settlements, fees, changing quotes, capital constraints or time between positions.

For a buyer, the premium paid is an initial cost. For a seller, the premium received comes with the obligation of the option position. A larger premium-per-day figure alone cannot establish a better trade for either side. The Recommendation and Theta Advantage labels do not fix those missing risk inputs.

The form also uses the full premium in its comparisons. For an in-the-money option, part of that premium reflects existing exercise value rather than time value. Dividing that full amount by days is another reason the output cannot be treated as the next day’s expected decay.

SEBI rule changes that reshaped weekly expiries

In its circular SEBI/HO/MRD/TPD-1/P/CIR/2024/132 of 1 October 2024, SEBI changed several rules for index derivatives. The dates below come from that circular. They explain why there are fewer weekly contracts than there used to be.

So, do weekly options need more margin on expiry day? For sellers of options that expire that day, yes: the extra 2% extreme loss margin applies. Buyers pay the premium upfront and their loss is limited to it. Your broker's margin screen shows the exact amount for your position.

Gamma and expiry-day risk

Gamma measures how fast an option's delta changes as the underlying moves. Near expiry, a strike close to the current index level has a very high gamma. In plain words, a small move can flip the option from nearly worthless to valuable, or the reverse, within minutes. That cuts both ways. A buyer can see a fast gain, but also a fast loss. A seller can collect the premium quickly, yet a sudden move against the position can cost many times that premium.

Expiry-day moves also bring wider bid-ask gaps and quick price changes, so exits can be worse than the screen price you planned on. Plan the maximum loss in rupees before entry, and decide whether you will hold into the close at all. If your option ends in the money at expiry, check how settlement and STT work for your broker and contract. Different NSE pages describe index option settlement differently, so read the contract specification for the exact series.

Record the comparison you actually made

Write the underlying, option type, strike, exact expiry, quote time, premium, quantity and planned exit. Keep expected event exposure separate from a forecast of profit. Comparing unmatched strikes or quotes taken at different times can make a premium difference look like an expiry effect.

Use the options breakeven calculator for expiry-payoff questions and the options Greeks calculator for its stated sensitivity model and limitations. The breakeven points calculator addresses estimated cost per unit. OneTradeJournal lets you log the trade and comparison notes manually; it does not select a contract or place an order.

Positional or intraday: which expiry fits which style

Intraday traders often use the weekly contract because the premium is lower and responds quickly to the day's move. The cost is that the same speed works against a wrong view. Positional traders who want to hold for days or weeks tend to look at monthly contracts, where time decay is gentler and the position has room for a pullback.

Whichever you choose, your own records show what works for you. After a few weeks, compare your weekly trades and monthly trades on the same measures: average holding time, win rate, average loss and charges paid. OneTradeJournal lets you log each trade by hand with the strategy, stop, target and emotions, and its reports split results by strategy and time. It does not choose the contract or place the order. See the options Greeks calculator for the sensitivity side and the F&O trading cost calculator for charges.

Sources

• NSE: Weekly-contract discontinuation notice (checked 15 October 2026).
• NSE: Revised index and stock expiry days (checked 15 October 2026).
• NSE: Equity Derivatives Contract Specifications (checked 15 October 2026).
• NSE: Market lots by expiry month (checked 15 October 2026).
• Options Industry Council: Theta (checked 15 October 2026).
• Options Industry Council: Gamma (checked 15 October 2026).