Sensex and Nifty 50 are both Indian stock-market benchmarks, but they track different exchange universes. Sensex targets 30 companies drawn from the BSE 100, while Nifty 50 tracks 50 stocks listed on the NSE. Both weight constituents by the market value of shares considered available to trade, so neither is inherently better: follow the benchmark that matches the market or portfolio you want to track.
Sensex vs Nifty 50 at a glance
| Feature | Sensex | Nifty 50 |
|---|---|---|
| Exchange benchmark | BSE | NSE, maintained by NSE Indices |
| Constituent target | 30 companies | 50 stocks |
| Selection universe | Derived from BSE 100 constituents | Stocks selected under NSE Indices methodology |
| Weighting method | Float-adjusted market capitalization | Free-float market capitalization |
| Published market coverage | A directly comparable current percentage is not stated in the BSE methodology | 53.73% of the free-float market capitalization of NSE-listed stocks, as of March 30, 2026, according to NSE Indices |
Sources: BSE Indices Methodology and NSE Indices’ Nifty 50 page. The coverage figure uses NSE-listed stocks as its denominator; it cannot be treated as a direct comparison with Sensex.
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How the indices are built
Sensex: 30 companies selected from the BSE 100
BSE’s methodology sets a target of 30 companies drawn from the BSE 100. Eligibility includes at least six months of listing history on BSE, trading on every trading day during the six-month reference period, and a derivatives contract. BSE ranks eligible companies using six-month average float-adjusted and total market capitalization, alongside traded-value and minimum-weight screens. Selection rules favor existing constituents at specified ranks as the index approaches its target. Qualifying shares with differential voting rights can mean more than 30 securities while the company count remains 30.
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Nifty 50: 50 NSE stocks weighted by free float
NSE Indices describes Nifty 50 as a diversified 50-stock index representing important sectors of the economy. It has used free-float market-capitalization weighting since June 26, 2009. Under this approach, promoter, group, locked-in, and other identifiable strategic holdings are treated as non-free-float; the index weight reflects shares considered available to trade. NSE’s index-calculation explanation describes the free-float method, while its equity-indices methodology document is identified as March 2026.
Why Sensex and Nifty 50 can move differently
The indices have different selection universes and constituent counts, which can produce different holdings and company weights. As a result, they need not rise or fall by the same percentage over a given period. This follows from their documented construction; it is not a forecast about which will perform better.
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Also, index points are not directly comparable measures of performance. To compare returns, use percentage changes over the same dates and make sure you are comparing the same kind of return measure.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWhich index should you follow?
- Follow Sensex if you want BSE’s 30-company headline benchmark.
- Follow Nifty 50 if you want NSE’s 50-stock headline benchmark.
- For a portfolio or fund comparison, start with the benchmark the portfolio or fund is intended to track. Compare its holdings and benchmark context rather than selecting an index based only on its name or index-point level.
Neither benchmark is inherently safer or guaranteed to deliver higher returns. The useful choice is the one aligned with the exchange universe or benchmark context you care about.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.If you are choosing an index fund or ETF
An index name alone is not enough to assess an investment product. Check which index the fund tracks, then compare the specific fund’s costs, holdings, and tracking behavior. Those details vary by product and date; the index methodology does not establish the merits or terms of any particular fund.
NSE Indices lists categories of ETF and domestic index-fund issuers on its Nifty 50 page. Verify current product availability and details with the provider before investing.
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