Stock Average Calculator | Optimize Investments

Optimize your stock investments with our Stock Average Calculator. Easily calculate your average stock prices and make informed decisions for your portfolio.
Stock Average Calculator

Stock Average Calculator

First Purchase

Second Purchase

What is a Stock Average Calculator?

A stock average calculator is an online calculator that helps investors determine the average price they paid per share of a stock. This average price is important when you've purchased the same stock at various price points and quantities. This calculator helps to estimate your overall investment, potential profits or losses, and provides valuable insights for both short-term traders and long-term investors.

How does the Stock Average Calculator Work?

The stock average calculator uses a simple mathematical formula to determine the average price per share. To use it, you only need two key inputs:-

  • Share Price: This refers to the price you paid for the shares at each purchase. If you've bought the stock multiple times, enter each individual price.
  • Number of Shares: For each purchase, enter the number of shares you acquired.

Formula to Calculate

The calculator then uses a formula to determine your average price per share:

Average Stock Price = Total Cost of All Purchases / Total Number of Shares Purchased

While this basic formula suffices for calculating the average price per share for a single purchase, adjustments are necessary if you've made multiple purchases and seek to determine the average price for your shares.

The Adjusted Formula:

Average Stock Price = Σ (Share Pricei * Number of Sharesi) / Total Shares Purchased

This uses the summation notation (Σ), which means "sum of." Here:

  • i represents each individual purchase (1st, 2nd, etc.).
  • Share Pricei represents the price per share for purchase i.
  • Number of Sharesi represents the number of shares purchased in purchase i.
Formula Use Example

Let’s take an example for better understanding.

Imagine you have invested three times in Company X as follows:

  • First Purchase: On January 15, 2024, you bought 30 shares at ₹400 each.
  • Second Purchase: A month later, seeing a slight dip, you added another 20 shares at ₹350 each.
  • Third Purchase: By March 15, 2024, the price had risen slightly, so you strategically purchased 15 more shares at ₹425 each.

Let's calculate your average cost per share:

Total Cost: 30 shares (₹400/share) + 20 shares (₹350/share) + 15 shares (₹425/share) = ₹12,000 + ₹7,000 + ₹6,375 = ₹25,375

Total Shares: 30 shares + 20 shares + 15 shares = 65 shares

Now, to find the average price per share:

Average Price: ₹25,375 (total cost) / 65 shares = ₹390.38 per share

This means that even though the price fluctuated across your purchases, on average, you paid ₹390.38 per share.

Advantages of Using a Stock Average Calculator

Here are some of the advantages of using a stock average calculator:

  • Monitor portfolio health:The calculator helps you compare your average cost per share with the current market price. This comparison provides a quick snapshot of your portfolio's health for a specific stock. If the average cost is lower than the current price, you're potentially making a profit. Conversely, if the average cost is higher, you might be experiencing unrealized losses.
  • Informed Investment Decisions: Knowing your average price empowers you to make strategic choices. For instance, if the price dips and your average cost is significantly lower, you might consider buying more shares to bring down the average further (averaging down). Conversely, if the price soars and your average cost is much lower, it might be a good time to consider selling for a profit.
  • Set selling prices with confidence: By understanding your average cost, you can determine your desired profit margin.
  • Manage Downward Trends (Averaging Down): When share prices fall after your initial purchase, the calculator helps you identify the price point at which buying more shares would be beneficial.
  • Simplifies Calculations: Especially when you've made multiple purchases at different prices, manually calculating the average cost can be tedious and prone to errors. The share average calculator automates the process, saving you time and ensuring accuracy.
  • Accessible and user-friendly: Most shared average calculators are readily available online and require minimal effort to use. You simply input the number of shares purchased and the corresponding prices, and the calculator does the rest.

Steps to Use the Stock Average Calculator?

Utilising a stock average price calculator is straightforward. By adhering to these steps, you can effortlessly ascertain the average price for your stocks. Steps to Use a Stock Average Calculator:

  1. Input Stock Quantities: Enter the number of shares you currently hold for the specific stock you're interested in.
  2. Enter Purchase Prices: Indicate the price per share you paid each time you bought the stock. If you bought multiple times, enter each individual price.
  3. Repeat for Multiple Purchases: For each additional purchase you make at a different price, repeat steps 1 and 2.
  4. Calculate the average price: Click the "calculate" button (or similar option) to initiate the calculation and see your average price per share.
  5. Analyse Your Investment: Compare the resulting average price with the current market price of the stock. This comparison helps you understand if your overall purchase cost is currently higher or lower than the market price.

Common Mistakes to Avoid while using Stock Average Calculator ?

To ensure the accuracy of your calculations, avoid these common pitfalls when using a stock average calculator:

  • Inaccurate or Outdated Prices: Double-check that you're entering the correct purchase prices for your shares.
  • Missing Updates: Remember to update the calculator with any recent purchases you've made.
  • Limited Analysis: While the average price is helpful, consider other factors like market trends and company performance before making investment choices.


In conclusion, the Share Average Calculator helps investors in seeking clarity in their investment decisions. By calculating the average cost of their shares, investors can gain insights into portfolio performance and make informed choices.

  • Published
    Apr 25, 2024
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