Turn on any business news channel and you'll hear both numbers read out in the same breath: "Sensex up 400 points, Nifty up 120." They usually move in the same direction, which is exactly why beginners assume they're two names for the same thing. They're not.
Sensex is the benchmark index of the Bombay Stock Exchange (BSE), India's oldest stock exchange. Nifty 50 is the benchmark index of the National Stock Exchange (NSE). Each exchange runs its own index to represent the overall health of its listed market — they are calculated independently, by two different organisations, using two different (though similar) methodologies.
| Sensex | Nifty 50 | |
|---|---|---|
| Exchange | BSE | NSE |
| Number of stocks | 30 | 50 |
| Launched | 1986 | 1996 |
| Base year | 1978-79 | 1995 |
| Base value | 100 | 1,000 |
| Calculation method | Free-float market capitalisation weighted | Free-float market capitalisation weighted |
| Full form | Sensitive Index | National + Fifty |
Sensex's 30 companies are a subset of Nifty's 50 — most of India's largest listed businesses by market capitalisation (think Reliance Industries, HDFC Bank, ICICI Bank, Infosys, TCS) are dual-listed on both NSE and BSE and appear in both indices. Because both indices are free-float market capitalisation weighted — meaning bigger companies pull the index more than smaller ones — and share most of their biggest constituents, the two almost always move in the same direction on any given day, even though the exact percentage change can differ slightly.
People often ask why Sensex "is worth more" than Nifty when Sensex crosses, say, 82,000 while Nifty sits around 25,000. This has nothing to do with one exchange being bigger — it's purely a base-year artifact. Sensex was set to a base value of 100 back in 1978-79; Nifty 50 was set to a base value of 1,000 in 1995. Different starting points produce different absolute levels today. What actually matters for comparison is the percentage change, not the raw number — a 1% move in Sensex and a 1% move in Nifty represent the same scale of market movement. You can track both live, side by side, on their own interactive charts: Sensex live chart and Nifty 50 live chart.
Both exchanges also run broader and narrower indices — Nifty Next 50, Nifty Midcap 150, Nifty Bank, BSE 100, BSE Midcap, and sector-specific indices like Nifty IT or Nifty Pharma. Nifty 50 and Sensex are simply the two headline numbers everyone quotes because they're the oldest and most widely tracked.
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TRY SAMJHO BHAI →No. Nifty 50 is the benchmark index of the National Stock Exchange (NSE) and tracks 50 large companies, while Sensex is the benchmark index of the Bombay Stock Exchange (BSE) and tracks 30 large companies. They move very similarly because they share most of the same large companies, but they are calculated separately by two different exchanges.
Sensex is older. BSE launched Sensex in 1986, making it India's oldest stock market index, while NSE launched Nifty 50 in 1996, a decade later.
The absolute index level depends on each index's own base value and base year, not on which market is "bigger". Sensex uses a base value of 100 set in 1978-79, while Nifty 50 uses a base value of 1,000 set in 1995 — different starting points mean the numbers aren't directly comparable in absolute terms, only in percentage movement.
You can't buy an index directly, but you can invest in it indirectly through index mutual funds or ETFs that replicate the Nifty 50 or Sensex, or trade Nifty and Sensex futures and options contracts on the exchanges.
Educational information only, not investment advice. Index levels, base years and constituent counts are periodically revised by NSE and BSE; verify current figures on the exchanges' own websites before relying on them.
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