This free stock average calculator works out the weighted average price you've paid for a stock after buying it at different prices and quantities over time. Add each purchase — the number of shares and the price you paid — and the calculator instantly totals your shares, your total investment, and your weighted average buy price. Buying more shares at a different price naturally shifts this average, and the amount of shift depends on how many shares you buy relative to what you already hold, not just the price itself. This is a calculation tool based entirely on the purchases you enter; it does not use live market data, does not calculate brokerage, taxes or other charges, and does not provide investment advice or recommendations.
Total Shares
Total Cost (₹)
0.00
Avg. Price/Share (₹)
0.00
Example: ₹25,000 invested in 100 shares, plus ₹55,000 invested in 200 more shares → Total Investment = ₹80,000, Total Shares = 300, Average Price = ₹80,000 ÷ 300 = ₹266.67 per share.
This table breaks down every lot you've entered, showing what share of your total investment each purchase represents.
This calculator uses the standard weighted-average formula:
For multiple purchases, that expands to:
This is a weighted average, not a simple average of the prices — it's weighted by how many shares you bought at each price, so a larger purchase pulls the average toward its price more than a smaller one does.
Here's a worked example, calculated using this calculator's own logic:
| Purchase | Price per Share | Quantity | Investment |
|---|---|---|---|
| 1 | ₹250 | 100 | ₹25,000 |
| 2 | ₹275 | 200 | ₹55,000 |
| Total | — | 300 | ₹80,000 |
Average Price = ₹80,000 ÷ 300 = ₹266.67 per share. Enter these same two lots into the calculator above and it will show this exact figure. This is an illustrative example only.
Buying additional shares at a price above your current average generally pulls the average up; buying at a price below your current average generally pulls it down. How much the average moves depends heavily on the size of the new purchase relative to what you already hold — a small additional purchase has a modest effect, while a large one can shift the average significantly, even at the same price. This is simply the mechanics of a weighted average; it isn't a recommendation to buy more or less of anything.
Averaging down describes buying additional shares of a stock you already hold at a price lower than your existing average, which reduces the combined weighted average purchase price. For example, if you hold 100 shares at an average of ₹200 and buy 100 more shares at ₹150, your new average becomes (100×200 + 100×150) ÷ 200 = ₹175. Reducing the average purchase price does not guarantee a profit — the market price can rise or fall independently of your calculated average cost, and a lower average simply changes the price at which you'd break even, not the future direction of the stock.
Averaging up is the opposite situation: buying additional shares at a price above your existing average, which increases the combined weighted average. For example, if you hold 100 shares at an average of ₹150 and buy 100 more at ₹200, your new average becomes (100×150 + 100×200) ÷ 200 = ₹175 — the same mathematical mechanism as averaging down, just moving the average in the other direction.
This is a different, reverse calculation from what this calculator performs — instead of computing the average from known purchases, it works backward from a desired average to find the required additional quantity. This calculator does not include that reverse-calculation feature; the tool above takes your actual purchases as input and computes the resulting average, rather than solving for a target. If you want to explore this mathematically, it generally involves setting up the weighted-average formula above with the target average as a known value and solving for the unknown additional quantity.
Your average buy price (what this calculator computes) is the weighted cost of the shares you've purchased. The current market price is simply what the stock is trading at right now — a completely separate figure that this calculator does not fetch or display. Comparing the two can give a sense of unrealized gain or loss: broadly, (Current Market Price − Average Buy Price) × Total Shares gives an approximate unrealized profit or loss figure, but you would need to look up the current market price yourself and enter it manually if you want to work this out — this calculator does not connect to live NSE, BSE or any other market data.
No. This calculator computes a weighted average based purely on the price per share and quantity you enter for each lot. It does not include brokerage, Securities Transaction Tax (STT), exchange charges, GST on charges, stamp duty, or any other transaction-related costs, unless you choose to build them into the price you enter for a given lot yourself. Your actual cost basis, once these charges are included, will generally be somewhat higher than the average price this calculator shows. Applicable charges and tax rules can change and vary by broker, so check your broker's contract note or current official guidance for exact figures rather than relying on this calculator for tax reporting.
The weighted-average calculation this tool performs applies equally to shares purchased on Indian exchanges such as NSE and BSE, and works regardless of which broker you use to place your trades — this calculator isn't affiliated with, and doesn't pull data from, any specific broker, exchange or market-data provider. It's simply a calculation tool: you enter the purchases you've made, in rupees, and it computes your weighted average. It does not provide live NSE or BSE prices, and results are only as accurate as the purchase data you enter.
This calculator takes the shares and price you enter for each purchase lot, multiplies them to get that lot's investment, sums the investment and shares across all lots, and divides total investment by total shares to give your weighted average price — exactly the formula shown above. It does not include brokerage, taxes, exchange charges or other transaction costs; it does not use live market data from NSE, BSE or any other source; and it does not calculate unrealized profit or loss unless you separately look up and factor in a current market price yourself. Results depend entirely on the purchase data you enter and are only as accurate as that data.
This calculator is provided for educational and informational purposes. It calculates a weighted average based on the prices and quantities entered by the user. It does not provide investment, trading or financial advice, and does not recommend buying, selling or holding any security. Actual portfolio costs may differ once brokerage, taxes and other transaction charges are included. Reducing your average purchase price does not guarantee a profit, since the market price can move independently of your average cost. ToolPlex is not affiliated with any stock exchange, broker or regulatory body.
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A simple average would just average the prices you paid. A weighted average — what this calculator uses — also accounts for how many shares you bought at each price, giving your true average cost.
Click any shares or price value in your purchase list to edit it directly, then press Enter or click away to save. Each lot also has its own remove button, or use "Reset All Lots" to start over.