Stock Average Calculator
InvestmentBought the same stock at different prices? Find your true weighted-average cost per share so you know exactly where you break even.
In short: The stock average (weighted-average) price is your total money invested divided by the total number of shares held — not the simple average of the prices you paid.
Your inputs
Your inputs
- Buy 1 — quantity
- 10 shares
- Buy 1 — price
- ₹100
- Buy 2 — quantity
- 20 shares
- Buy 2 — price
- ₹80
- Buy 3 — quantity
- 0 shares
- Buy 3 — price
- ₹0
Results
Total shares
30
Total investment
₹2,600
Average price
₹87
Per share
Investment by purchase
How much you invested at each buy price.
Purchase breakdown
| Purchase | Quantity | Price | Amount |
|---|---|---|---|
| Buy 1 | 10 | ₹100 | ₹1,000 |
| Buy 2 | 20 | ₹80 | ₹1,600 |
| Total | 30 | ₹87 | ₹2,600 |
Average price is the total cost divided by the total number of shares.
How the Stock Average Calculator works
Formula
- quantity
- Shares bought in each purchase
- price
- Price paid per share in that purchase
- Σ
- Sum across all your purchases
Step-by-step calculation
Worked with the default values.
- 1
Total cost — Σ(qty × price)
10×₹100 + 20×₹80
= ₹2,600
- 2
Total shares — Σ(qty)
Sum of all quantities
= 30 shares
- 3
Average price
Total cost ÷ Total shares
= ₹87
How it works
- Each purchase contributes cost equal to its quantity times its price.
- All purchase costs are added to give the total money invested, and all quantities are added to give total shares.
- Dividing total cost by total shares gives the weighted-average price — bigger buys pull the average closer to their price.
Examples
Buy 10 shares at ₹100, then 20 shares at ₹80
Total ₹2,600 for 30 shares → average ₹86.67 per share, not the simple mid-point of ₹90.
Add a third buy of 30 shares at ₹70
60 shares for ₹4,700 → average drops to about ₹78.33, showing how averaging down lowers your cost.
Understanding the Stock Average Calculator
What "averaging" a stock really means
When you buy the same share more than once at different prices, your cost is no longer a single number — it is a blend. The stock average price (also called the weighted-average cost) tells you what each share cost you *on average*, weighting every purchase by how many shares it bought. This is the number that determines your break-even point and, together with the current price, your real profit or loss.
The formula is simple: add up the money spent on every purchase, add up all the shares bought, and divide.
Average price = Σ(quantity × price) ÷ Σ(quantity)
Why the weighted average, not the simple average
A common mistake is to average the *prices*. If you buy 10 shares at ₹100 and 20 shares at ₹80, the simple average of the prices is ₹90 — but that is wrong, because you bought twice as many shares at the lower price. The correct weighted average is (10×100 + 20×80) ÷ 30 = ₹86.67. The bigger purchase pulls the average toward its price. Only when you buy identical quantities do the two methods agree.
Averaging down and averaging up
- Averaging down means buying more after the price falls, lowering your average cost. It reduces the price the stock must reach to break even, but it also puts more capital into a position that is currently losing.
- Averaging up means buying more as the price rises, raising your average cost. Investors do this to add to winners they still believe in.
Neither is automatically right. Averaging down a fundamentally sound company during a market-wide dip can be a smart use of a lower price. Averaging down a business in genuine decline simply increases the size of a losing bet.
Beyond the average price
Remember this calculator shows the *pure* purchase average. Real trades add brokerage, STT, GST and stamp duty, which nudge your effective cost — and therefore your break-even — slightly higher. Once you know your average, pair it with the current market price to gauge your unrealised gain, and use the Brokerage Calculator to see the charges that sit on top.
Pros
- Reveals your true blended cost instead of a misleading simple average.
- Shows exactly where you break even before profit begins.
- Handles unequal quantities across multiple buys automatically.
- Works for shares, ETFs, mutual fund units or crypto alike.
- Helps you plan how much to add to hit a target average price.
Cons
- Excludes brokerage, STT, GST and stamp duty, so real cost is slightly higher.
- Averaging down a weak stock can deepen losses rather than limit them.
- Limited to three purchases in this tool.
Tips
- 1Average down only when you still have conviction in the company, not just to feel better about a loss.
- 2Decide your maximum position size in advance so averaging does not overconcentrate your portfolio.
- 3Factor in brokerage and taxes for a realistic break-even, especially on small lots.
- 4Record each buy price and quantity so your average stays accurate over time.
- 5Consider staggered buys rather than a single large one to smooth out volatility.
Frequently asked questions
Everything you need to know about the Stock Average Calculator.
What is stock averaging?
Why not just take the simple average of the two prices?
What is averaging down?
Does this calculator include brokerage and taxes?
How many purchases can I add?
Is averaging down always a good idea?
What is my break-even price after averaging?
Does averaging change my number of shares?
Can I use this for mutual fund units or crypto?
Methodology & sources
How the Stock Average Calculator is calculated, and where the underlying rules come from.
How we calculate it
Every result is produced by a single, shared and tested financial-formula library used across the whole site — so the maths is consistent from one calculator to the next. Figures are estimates based on the inputs you enter and standard assumptions (such as regular compounding and constant rates); real-world outcomes vary with taxes, fees and changing rates. All calculations run in your browser — nothing you type is stored or sent to a server.
Editorial policy & disclaimer. FinCalcHub provides free educational tools and estimates — not personalised financial, tax or investment advice. Verify important decisions with a qualified professional. Read our editorial approach, disclaimer and privacy policy.
Last reviewed for accuracy on .
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