Stock Average Calculator
Buying 100 shares at ₹500 and 50 more at ₹440 gives an average buy price of ₹480 on 150 shares.
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If you bought the same share at different prices, your average cost is the total amount paid divided by the total number of shares.
How the stock average calculation works
Average price = Σ(quantity × price) ÷ Σ quantity
Example
Buying 100 shares at ₹500 and 50 more at ₹440 gives an average price of ₹480; total cost is ₹72,000.
Stock Average Calculator scenarios
| Extra shares at ₹400 | Total shares | Total cost | Average price | Rise needed from ₹400 to break even |
|---|---|---|---|---|
| 0 | 100 | ₹50,000 | ₹500.00 | 25.0% |
| 25 | 125 | ₹60,000 | ₹480.00 | 20.0% |
| 50 | 150 | ₹70,000 | ₹466.67 | 16.7% |
| 100 | 200 | ₹90,000 | ₹450.00 | 12.5% |
| 200 | 300 | ₹1,30,000 | ₹433.33 | 8.3% |
| 400 | 500 | ₹2,10,000 | ₹420.00 | 5.0% |
What changes the result
- The quantity bought at each price — the average moves towards the price of the larger purchase.
- Brokerage, STT, stamp duty and other charges, which add to your true cost.
- Bonus issues and stock splits, which change the share count and must be adjusted for.
- Partial sales, which do not change the average of the shares you still hold (FIFO is used for tax).
How to use this calculator
- Enter the quantity and price of your first purchase.
- Add each further purchase of the same stock.
- Enter the current market price.
- Read your average buy price, total cost and current profit or loss.
Stock Average Calculator FAQs
Does averaging down reduce risk?
It lowers your average cost but increases your exposure to that stock. Review why the price fell before buying more.
How do bonus shares and splits affect my average?
The total cost stays the same but the number of shares rises, so the average price falls proportionally. For a 1:1 bonus, the average halves.
Is the average price used for capital gains tax?
Not directly. For tax, shares are matched on a first-in, first-out (FIFO) basis, so the cost of the specific lots sold is used.
Results are estimates for planning only and are not financial, tax or investment advice. Check figures with your bank, fund house or tax adviser before acting on them.