Stock Average Price Calculator: Calculate Your Cost Basis

📊 Stock Average Price Calculator

A Stock Average Price Calculator (also known as an average share price calculator India or stock purchase average calculator) computes the weighted average cost per share when you make multiple purchases at different prices. It helps you determine your break-even price and total investment.

This is an essential stock investment calculator for:

• tracking cost basis
• planning exits or adding to positions (averaging down/up)
• tax reporting and record-keeping

The Formula — How Average Price Is Calculated

The formula used by every reliable average price calculator for stocks is:

Weighted average price = (Σ (Quantityi × Pricei)) ÷ (Σ Quantityi)

Where:

• Quantityi = number of shares bought in transaction i
• Pricei = buy price per share in transaction i

Example (manual)

You bought 100 shares at ₹250 and later 200 shares at ₹275.
Total investment = (100 × 250) + (200 × 275) = ₹25,000 + ₹55,000 = ₹80,000
Total shares = 100 + 200 = 300
Average price = ₹80,000 ÷ 300 = ₹266.67

You can also use an online stock trading calculator or our embedded Stock Average Price Calculator to compute this instantly.

How to Use the Online Stock Average Price Calculator

1. Start with the first purchase: enter quantity and buy price.
2. Add the second purchase: enter quantity and buy price.
3. Click Add Entry to include further purchases.
4. Click Calculate — the tool will validate inputs and show:

• Total Quantity (sum of shares)
• Total Investment (sum of quantity × price)
• Average Price (per share)

If any value is invalid (non-positive or missing), correct it — the calculator ensures accurate results before computing.

Why Average Price Matters (Practical Uses)

• Break-even analysis: Know the price you must sell at to recover investment.
• Averaging strategies: Decide whether averaging down (buying more as price drops) makes sense.
• Performance tracking: Compare current market price against your average to compute unrealized P/L.
• Simplified record-keeping: Useful for tax calculations and reporting.

Example Walkthrough (Using the Calculator)

Suppose you have these buys:

• Buy 1: 50 shares @ ₹120
• Buy 2: 30 shares @ ₹150
• Buy 3: 20 shares @ ₹110

Manual calculation:
Total shares = 50 + 30 + 20 = 100
Total investment = (50×120) + (30×150) + (20×110) = 6,000 + 4,500 + 2,200 = ₹12,700
Average price = 12,700 ÷ 100 = ₹127.00

FAQs

What is a Stock Average Price Calculator?

A tool that calculates the weighted average cost per share across multiple purchases, showing total investment, total shares, and average buy price.

How do I calculate the average price of a stock?

Use the formula (Σ quantity × price) ÷ (Σ quantity). An average price calculator for stocks automates this.

Can I include brokerage or fees?

Not by default in simple calculators. For accurate cost basis, add per-transaction fees to the buy price, or include an additional fee field if available.

Is this useful for Indian investors?

Yes — the average share price calculator India use case is identical. Consider brokerage, taxes (STT, GST), and other charges when calculating final cost basis.

References:

• Investopedia — Average Price
• NSE India — Official Market Data