This quick guide shows how the Stock Average Price Calculator recomputes your blended cost per share when you make an additional purchase. Use it before averaging down (or up) to see the impact instantly.
Quick overview #
The calculator combines your existing holding and a new buy to show the adjusted average cost per share. It helps you understand how a new purchase affects your overall position.
Fields to fill #
- Initial Purchase – No. of Share(s): count of shares you already own.
- Initial Purchase – Average Price Per Share: original average acquisition price.
- New Purchase – No. of Share(s): number of additional shares you plan to buy now.
- New Purchase – Average Price Per Share: price you will pay for the new shares.
Step-by-step #
- Open the Stock Average Price Calculator page.
- Enter your existing holding details under Initial Purchase.
- Enter planned additional shares and price under New Purchase.
- Click Calculate Average Price.
- Review updated Total Shares, Average Price and Total Investment.
Tip
Re-run with hypothetical extra purchases before committing. Sometimes averaging down barely moves the needle—helping you decide if capital is better deployed elsewhere.
Example #
You hold 100 shares at ₹200. You buy 50 more at ₹150.
Visual snapshot
Two purchase points (blue & green) blend into a lower average (dark) cost basis.
- Total Shares: 150
- Total Investment: ₹25,000 (100×200 + 50×150)
- Average Price: ₹25,000 ÷ 150 = ₹166.67
Average Price = Total Investment ÷ Total Shares
Where Total Investment = Σ (Shares × Price) across all purchase lots.
Tips #
- Include brokerage or fees in price for more accurate totals.
- If total shares becomes zero, average price resets to ₹0.00.
- This tool focuses on cost averaging only; it doesn’t show profit, loss or taxes.