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Sensex and Nifty are benchmark indexes, not shares or rupee balances. NSE equity trading normally runs from 09:15 to 15:30 India time, after a 09:00–09:08 pre-open, while the closing session runs from 15:40 to 16:00. A 100-point move is 100 index units; its percentage meaning depends on the starting level, and its rupee impact depends entirely on your exposure. The indexes can rise while an individual stock falls because they are weighted baskets whose constituents do not move equally.
Sensex and Nifty trading hours
The following timetable is NSE’s published schedule for the regular equity market. It applies to normal sessions, not every derivative segment or special exchange event.
| Session | NSE regular-equity time (India) | What happens |
|---|---|---|
| Pre-open | 09:00–09:08 | Orders are collected and an opening price is discovered. The pre-open phase is separate from continuous trading. |
| Normal market | 09:15–15:30 | Continuous trading in the normal and odd-lot markets. |
| Closing session | 15:40–16:00 | A separate closing-session window under the exchange’s rules. |
The seven-minute interval from 09:08 to 09:15 is not part of the normal continuous session. Do not assume that an order submitted during one phase is treated identically in another.
Holidays and special sessions
Exchange holidays can close the market, and the timetable can change for a special session such as Muhurat trading. Check the NSE holiday calendar for a particular date. Sensex cash trading follows the BSE’s own published calendar and session notices, so verify BSE times separately when you need a date-specific answer. These cash-market hours should not be treated as the hours of every futures or options contract.
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What the two indexes measure
The Sensex and Nifty are baskets of large, actively traded Indian companies. Sensex is the BSE benchmark; Nifty 50 is NSE’s 50-stock benchmark. An index compresses many share prices into one level so investors can track a broad market segment, compare a portfolio with a benchmark and obtain a reference for index funds and derivatives.
NSE describes indexes as reflecting changing market expectations about future dividends from India’s corporate sector. Because a basket averages many companies, company-specific news tends to be diluted while information affecting the market as a whole has more influence. That is why an index is an economic signal and benchmark, not a report of every investor’s return.
Basket size is not the same as market coverage
Sensex conventionally contains 30 constituents, while Nifty 50 contains 50. Membership is reviewed, so the current constituent lists should be checked before making a date-sensitive statement. A larger basket does not automatically make one index superior: the companies, sector mix and free-float weights are different.
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How Sensex and Nifty are calculated
Weighted market value, not a simple average
A simple average would give a tiny company the same influence as the largest company. Instead, NSE explains that the technically appropriate approach is a weighted average, with each stock’s weight proportional to its market capitalization. Modern Nifty 50 construction uses free-float market capitalization: the value of shares realistically available to public investors, rather than every share issued by a company.
Nifty 50 has used the free-float methodology since June 26, 2009. The exchange’s Nifty profile reported that the index represented 53.73% of NSE free-float market capitalization on March 30, 2026; that figure was published in a profile updated April 22, 2026, and will change as prices, share counts and constituents change.
The conceptual formula
The calculation can be expressed in simplified form as:
Index level = (current free-float market value of constituents ÷ adjusted base market value) × base index value.
The “divisor” or adjusted base market value is maintained so that a stock split, bonus issue, rights issue, special dividend, constituent replacement or other mechanical event does not create a false market jump. The exact production calculation uses the exchange’s methodology, corporate-action adjustments and constituent data; the formula above is a way to understand the logic, not a substitute for official calculation files.
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Base value and real-time publication
NSE states that Nifty information is calculated in real time and identifies a base index value of 1,000 on its index-information page updated August 14, 2026. The base is a scaling convention. It does not mean that an investor once paid ₹1,000, nor does it determine the rupee value of a later point.
What an index point means
An index point is one unit on the index scale. If an index moves from 24,000 to 24,100, it has gained 100 points. That statement alone does not say whether the move was large or small, or how many rupees an investor made.
Convert points into a percentage
Use the prior index level as the denominator:
Percentage change = (new index − old index) ÷ old index × 100.
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For a hypothetical move from 24,000 to 24,100, the calculation is 100 ÷ 24,000 × 100 = 0.4167%, or about 0.42%. The same 100-point move would be 1% from a 10,000 starting level and 0.25% from a 40,000 starting level. Always quote the points and the percentage together when comparing days or periods.
Why points do not equal rupees
The index is a scale, not a tradable quantity by itself. Your result depends on what you own and the contract or fund’s specifications.
| Exposure | How an index move relates to money | Important qualification |
|---|---|---|
| Index fund or exchange-traded fund | A 0.42% index rise would ordinarily suggest roughly a 0.42% gross change in a closely tracking product. | Fees, tracking error, cash holdings, taxes and the fund’s actual price can produce a different result. |
| Index futures | Profit or loss is the index-point change multiplied by the contract’s rupee value per point. | That multiplier and the contract size are specified by the exchange and can change; check the current contract specification. |
| Index options | The point move affects the option’s value through its contract multiplier and option sensitivities. | Delta, time decay, implied volatility, strike and expiry can dominate the result; 100 index points is not automatically ₹100. |
| Individual shares | There is no fixed rupee conversion from an index point to a share’s gain. | Your return depends on that company’s price, corporate actions and the number of shares held. |
NSE’s portfolio illustration makes the distinction clear: a portfolio built to match index weights should track the index return, whereas the index itself is an information and benchmark measure. A portfolio that is not matched to those weights can diverge substantially.
Why an index can rise when your share falls
Every constituent has a weight. A heavily weighted company’s rise can outweigh declines in several smaller constituents, while a broad advance in low-weight stocks may not offset a fall in the largest companies. Sector composition also matters: a technology, banking or energy shock can affect the benchmark differently from a company-specific event in your holding.
A simple weighted example
Imagine an index with two components: Company A has an 80% weight and falls 1%, while Company B has a 20% weight and rises 3%. The approximate index return is (0.80 × −1%) + (0.20 × 3%) = −0.2%. Company B rose, but the index still fell because Company A carried more weight. Real indexes contain many stocks and use free-float values, but the principle is the same.
What the index is signalling
Because averaging tends to cancel isolated company news, an index move often reflects information investors are applying across many companies: expected earnings, interest rates, currency conditions, commodity prices, policy or risk appetite. It is still an imperfect signal. A concentrated move in a few large constituents can make the headline index look stronger or weaker than the typical stock.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How closing values are formed
NSE says NIFTY 50 closing prices use the weighted-average prices of constituents during the last half-hour of trading. This is intended to represent the closing market more robustly than one isolated trade.
The stale-price problem
If a constituent is illiquid, its last traded price may be old. That stale price can remain in the calculation and make the displayed index less current than the prices of actively traded stocks. A quoted closing level is therefore a rules-based benchmark value, not a guarantee that every component could have been traded at that exact price at the same instant.
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Sensex versus Nifty: which is better?
There is no universal winner. Choose the benchmark that matches the market, product or portfolio you are evaluating, and compare percentage returns over identical dates rather than comparing raw point levels.
| Comparison | Sensex | Nifty 50 |
|---|---|---|
| Exchange | BSE benchmark | NSE benchmark |
| Constituents | Conventionally 30; membership can change at reviews | 50; membership can change at reviews |
| Weighting context | Free-float market-cap approach is used in the benchmark context; current weights vary by constituent | Free-float market-cap methodology; adopted June 26, 2009 |
| Common uses | Market benchmarking and products linked to the BSE benchmark | Benchmarking, index funds and derivatives, as identified by NSE |
| Best comparison method | Use percentage returns, constituent and sector exposure, product tracking difference and the same measurement dates | |
Nifty’s March 2026 profile reported an impact cost of 0.02% for a ₹50 lakh Nifty 50 portfolio. That is an exchange-published reference for the stated portfolio size and date, not a promise that every trade, investor or market condition will incur that cost.
How circuit breakers turn percentages into points
India’s index circuit-breaker framework is triggered by percentage moves and then expressed operationally as absolute Sensex and Nifty points. SEBI’s framework uses quarterly reference closes and separate rounding rules to convert the percentage thresholds into point levels. The resulting point trigger changes when the reference close changes.
Do not treat an old circular as the complete current rulebook. For a live trading decision, check the latest SEBI and exchange notices, including any amendments, the applicable reference close and the market segment involved. Circuit breakers are market-wide controls; they are not a forecast of where an index will finish.
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A practical way to read a daily Sensex or Nifty headline
- Record the starting and ending levels. Confirm whether the report refers to an intraday level, an official close or a futures price.
- Compute the percentage move. Divide the point change by the prior cash-index level and multiply by 100.
- Check the time and session. A pre-open indication, normal-session quote and closing-session value are not interchangeable.
- Look at constituent breadth and weights. Find out whether the move came from many stocks or a few large constituents.
- Match the benchmark to your exposure. Compare your fund, futures contract, option or shares using its own price, multiplier and costs.
- Check for calendar and methodology effects. Verify holidays, special sessions, corporate actions, rebalances and stale prices before drawing a conclusion.
Common mistakes to avoid
- Calling a point move a rupee gain without stating an investment amount or contract multiplier.
- Comparing 100 points on two different index levels without converting both moves to percentages.
- Assuming every Nifty or Sensex constituent rose because the index rose.
- Using NSE cash-market hours as the timetable for derivatives or as the BSE’s date-specific schedule.
- Ignoring free-float weights, which can make a company’s total market capitalization a poor guide to its index influence.
- Treating a closing value as perfectly contemporaneous when an illiquid constituent may have a stale last trade.
- Using an outdated constituent list or circuit-breaker threshold after a review or quarterly reference update.
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