Stock Average Price Calculator
Add every purchase lot and get the weighted average price, total shares and total invested.
Result
- Total invested
- ₹3,900
- Average price including charges
- ₹130.00
- Add your charges above to see the true cost
| Lot | Quantity | Price | Amount | Share of investment |
|---|---|---|---|---|
| Lot 1 | 10 | ₹150.00 | ₹1,500 | 38.5% |
| Lot 2 | 20 | ₹120.00 | ₹2,400 | 61.5% |
Averaging changes your cost base, not the outlook for the business. Buying more of a falling stock increases both the position and the loss if it keeps falling.
Estimated from the numbers you entered — not a projection of guaranteed returns.
About this calculator
When you buy the same stock more than once, your cost per share is the weighted average of every lot — total money in divided by total shares held, not the simple average of the prices. Add a row for each purchase to see the true average, and the optional charges box to see what the position really cost you.
Formula
- Total shares = Σ (quantity of each lot)
- Total invested = Σ (quantity × price of each lot)
- Weighted average price = Total invested ÷ Total shares
Frequently asked questions
Why is it not the simple average of my buy prices?
Because bigger lots count for more. Buying 10 shares at ₹100 and 90 at ₹200 averages to ₹190, not ₹150 — the weighting is by quantity.
Should charges be included in my average?
For deciding when you are actually in profit, yes. Enter your total buy-side charges and use the "average price including charges" figure, or go to the break-even price calculator for the full round-trip cost.
Does this handle averaging up as well as down?
Yes. The maths is identical whether the later lots are cheaper or dearer than the first.