Stock Average Calculator
Calculate your average buy price across multiple purchases, plus live profit or loss. Free, no login, nothing stored.
Enter each purchase as a separate row. Works for averaging down, averaging up, or tracking a single buy.
What Is a Stock Average Calculator?
A stock average calculator works out your weighted average buy price when you've purchased the same stock at different prices across multiple transactions. This is the actual cost basis your broker uses for profit and loss calculations, which is often different from simply averaging the prices themselves, since it accounts for how many shares were bought at each price.
Free, No Login, No Data Stored
This calculator runs entirely in your browser. There is no sign-up, no account, and nothing you enter is saved, tracked, or sent anywhere. It's free to use as many times as you need.
How to Use This Stock Average Calculator
- Enter the quantity and buy price for your first purchase.
- Tap "+ Add Another Buy" for each additional purchase of the same stock, at whatever price you bought it.
- Remove any row using the small delete button next to it.
- Optionally enter the Current Market Price to see your live profit or loss.
- Results update instantly as you type - Total Quantity, Total Investment, and your Average Buy Price.
Average Buy Price Formula
Average Price = Total Investment / Total Quantitywhere
Total Investment = Sum of (Quantity x Price) for every purchase
Profit/Loss = (Current Price x Total Quantity) - Total InvestmentProfit/Loss % = (Profit/Loss / Total Investment) x 100
This is a simple calculation tool for cost basis and profit/loss tracking. It does not account for brokerage fees, STT, or other transaction charges, which will make your actual net cost slightly different.
What Is Averaging Down and Averaging Up?
Averaging down means buying more shares of a stock you already hold at a lower price than your existing average, which brings your overall average buy price down. Averaging up is the opposite - buying more at a higher price, which raises your average.
Both are common strategies used by investors, but neither guarantees a better outcome - a lower average price still means a loss if the stock keeps falling, and this calculator only shows the arithmetic of your position, not whether adding to it is a good decision for your situation. This tool provides factual calculations only and is not financial advice; consider consulting a registered investment advisor for guidance specific to your circumstances.
Who Is This Calculator For?
- Retail investors tracking their cost basis across multiple purchases of the same stock.
- Anyone considering averaging down or up who wants to see the exact effect on their average price before deciding.
- Traders reconciling their own records against broker contract notes.
Frequently Asked Questions
Does this include brokerage and other charges?
No, this calculator uses only the quantity and price you enter for each transaction. Brokerage, Securities Transaction Tax (STT), GST, and other charges will make your actual cost basis slightly higher than shown here.
Is averaging down always a good strategy?
Not necessarily. Averaging down lowers your cost basis, but it also increases your exposure to a stock that has been declining, and the stock could continue to fall further. This calculator only shows the mathematical effect of an additional purchase, not whether it's the right decision for your portfolio.
Can I use this for mutual funds or SIPs too?
Yes, the same weighted-average logic applies. Enter each SIP installment's units and NAV as a separate row to find your average purchase NAV.
How many transactions can I add?
There's no fixed limit - keep tapping "+ Add Another Buy" for as many purchases as you need to include.
What if I sold some shares - can this calculator handle that?
This version calculates your average buy price across purchases only. If you've partially sold your position, your remaining average cost typically stays the same as your average buy price under the standard weighted-average method, but you'd need to manually reduce the Total Quantity to reflect your remaining holding.
Is this calculator free to use?
Yes, completely free, with no login and no data stored, and works on both mobile and desktop.
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