Market Cap
Total value of a company = price × number of shares.
Why it matters
Market cap, short for market capitalization, is the true size of a company in the stock market. It is the total value of every share added together, and it is the single best first measure of how big a business really is.
A high share price on its own tells you nothing about size. A stock that costs ₹5,000 is not a bigger company than one that costs ₹50. To compare two companies fairly, you look at their market cap, not their share prices. Get this one idea right and you stop being fooled by how cheap or expensive a single share looks.
An everyday way to picture it
Picture a large pizza cut into slices. The price of one slice tells you almost nothing about the size of the whole pizza. A small pizza cut into a few slices might charge a lot per slice, while a giant pizza cut into many slices charges very little per slice.
To know how big the whole pizza is, you take the price of one slice and multiply it by the number of slices. A company works the same way. The share price is the price of one slice, the total shares are the number of slices, and market cap is the size of the whole pizza.
The number behind a company's size
Market cap is simple to work out. You take the price of one share and multiply it by the total number of shares the company has issued. That is the whole formula.
This is why a ₹50 stock can be a far bigger company than a ₹5,000 stock. Size depends on price and the number of shares together, never on price alone. A company at ₹50 a share with 100 crore shares is worth ₹5,000 crore. A company at ₹5,000 a share with just 1 crore shares is worth ₹5,000 crore too. Same size, even though one share looks one hundred times cheaper than the other.
The three size buckets
In India, companies are sorted into three broad groups by their market cap. Each bucket tends to come with a different mix of risk and growth, so knowing the bucket tells you what kind of company you are looking at.
| Bucket | Market cap (approx.) | What it usually means |
|---|---|---|
| Large cap | ₹20,000 crore and above | Big, well-established companies. Lower risk and steadier prices, but slower growth. |
| Mid cap | ₹5,000 crore to ₹20,000 crore | Medium-sized companies. A balance of moderate risk and solid growth potential. |
| Small cap | Below ₹5,000 crore | Smaller, younger companies. Higher risk and sharper price swings, but more room to grow. |
The names you hear about most, like a giant bank or a large software firm, are usually large caps. The many companies you have never heard of are mostly small caps. Market cap, not share price, is what places a company in its bucket, and it is the right measure to use whenever you want to compare two businesses by size.
See it for yourself
Set a share price and a number of shares, and watch the market cap and size bucket update.
Worked example: which company is bigger?
Two companies sit side by side. Company A trades at just ₹50 a share, so it looks cheap. Company B trades at ₹2,000 a share, so it looks expensive. Share price alone would tell you Company B is the bigger business. Let us check that with market cap.
| Company A | Company B | |
|---|---|---|
| Share price | ₹50 | ₹2,000 |
| Total shares | 100 crore | 1 crore |
| Market cap | ₹50 × 100 crore = ₹5,000 crore | ₹2,000 × 1 crore = ₹2,000 crore |
| Cheaper-looking share? | Yes, only ₹50 | No, ₹2,000 |
| Actually the bigger company? | Yes, ₹5,000 crore | No, ₹2,000 crore |
If you judge size by share price, you call Company B the bigger company, since its share costs forty times more. Market cap shows the opposite: Company A is more than twice the size of Company B. The cheaper share is in fact the larger business. Judge by share price and you misread which company is bigger; judge by market cap and you get it right.
Remember this
| Concept | Meaning |
|---|---|
| Market cap | The total value of a company, equal to share price times total shares |
| Share price | The cost of one share, which on its own says nothing about company size |
| Large cap | Big and steady, lower risk and slower growth |
| Mid cap | Medium-sized, a balance of risk and growth |
| Small cap | Smaller and riskier, with more room to grow |
In short: share price tells you the cost of one share, and market cap tells you the size of the whole company. Always compare companies by market cap, never by share price alone.