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The Sensex tracks 30 companies selected from BSE’s eligible universe; the Nifty 50 tracks 50 stocks on NSE. Both use free-float market-capitalization weighting. For monitoring Indian large-company market performance, either can be a useful reference: follow the one that matches the exchange or benchmark universe you care about. Neither is universally better, and neither predicts future returns.
What does the Sensex measure?
The Sensex is BSE’s benchmark index of 30 companies. Its level reflects the free-float market value of its constituents relative to a historical base. BSE’s current methodology draws the eligible universe from the BSE 100 and targets 30 companies, applying screens that include listing history, trading activity, derivatives linkage and float-adjusted market capitalization. Constituents are weighted by float-adjusted market capitalization. BSE’s Sensex overview provides background on the index and its calculation.
The Sensex uses a base period of 1978–79 and a base value of 100. Those are calculation reference points, not current market levels or measures of index quality. For current selection rules, consult BSE’s methodology document.
What does the Nifty 50 measure?
The Nifty 50 is NSE’s broad-market index of 50 stocks, intended to represent important sectors of the Indian economy. It has used free-float market-capitalization weighting since June 26, 2009. Its base period is November 3, 1995, with a base value of 1,000; NSE identifies the date as marking completion of one year of operations of its Capital Market Segment. These base figures are calculation references, not current levels.
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NSE Indices says the Nifty 50 represented about 53.73% of the free-float market capitalization of stocks listed on NSE as of March 30, 2026. That figure describes coverage of the NSE-listed universe on that date; it should not be directly compared with a Sensex coverage percentage without a BSE figure using the same definition and date. The Nifty 50 profile includes the index’s current profile and methodology information.
How free-float weighting works
Both indexes weight companies according to free-float, or float-adjusted, market capitalization. In broad terms, this weighting aims to account for shares available to investors rather than every share outstanding. Promoter, strategic and certain other holdings are treated as non-free-float in NSE Indices’ explanation of investible weight factors. As a result, companies with larger eligible free-float market values have more influence on an index’s movement than smaller-weighted constituents.
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Because the indexes have different constituents and weights, they can rise or fall by different amounts over the same period. Their shared weighting approach does not make them interchangeable.
Sensex vs. Nifty 50 at a glance
| Feature | Sensex | Nifty 50 |
|---|---|---|
| Exchange and eligible universe | BSE; eligible universe drawn from the BSE 100. | NSE; the Nifty 50 index universe. |
| Constituents | Targets 30 companies. | 50 stocks. |
| Weighting | Float-adjusted market capitalization. | Free-float market capitalization. |
| Base period and value | 1978–79; 100. | November 3, 1995; 1,000. |
| Coverage statistic | A comparable BSE coverage figure is not stated in the cited BSE sources. | About 53.73% of NSE-listed stocks’ free-float market capitalization as of March 30, 2026. |
The base periods and values differ because each index has its own calculation history. They do not indicate that one index is larger, better, safer or more likely to perform well.
Which index should you follow?
Follow the Sensex for BSE’s 30-company benchmark
Choose the Sensex if you want to track BSE’s benchmark and its 30-company selection from the BSE 100 eligible universe. This is especially straightforward when your existing market data, reporting or benchmark comparisons use BSE.
Follow the Nifty 50 for NSE’s 50-stock benchmark
Choose the Nifty 50 if you want NSE’s 50-stock benchmark or your data and comparisons are organized around NSE. Its constituent count and exchange universe differ from the Sensex, although both indexes use free-float weighting.
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For a general market reference
If you are monitoring broad Indian large-company performance and have no exchange-specific reason to prefer one, either can serve as a reference. Keep the index consistent when comparing performance over time, and remember that neither index is the whole market or a prediction of what comes next.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the index choice does—and does not—mean
The Sensex and Nifty 50 are indexes, not individual securities or direct investment products. Their levels summarize the movement of their respective constituent baskets according to each index’s rules. A higher or lower index level cannot be used by itself to compare quality, investment risk or likely future return, especially because the indexes have different base periods.
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Funds and exchange-traded funds designed to track the Nifty 50 exist, as noted by NSE Indices, but the existence of such products does not make the index itself an investment or establish that any particular product is suitable. A decision about investing requires evaluating the specific product and the investor’s circumstances; it is separate from deciding which index to monitor.
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How to compare their performance fairly
- Use the same start and end dates and compare percentage returns, not raw index point changes.
- Check that the figures refer to the same type of index return. A price-index comparison and a total-return comparison may treat distributions differently.
- Use the official exchange or index provider’s data and note that constituent selection and weights can change over time.
- Do not infer that past relative performance establishes which index will lead in the future.
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