Stock Average Calculator
Calculate your average buy price across multiple stock purchases.
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Stock Average Calculator
Use the formula and worked example below to calculate manually.
Overview
The stock average calculator computes your average buy price when you purchase shares of the same stock at different prices and quantities — useful for tracking your break-even point after averaging down or up.
How to use this calculator
- Enter the quantity and price for each stock purchase (add as many transactions as needed).
- The calculator shows the total shares held, total amount invested, and average cost per share.
- Enter the current market price to see your unrealised profit or loss.
Understanding the inputs & results
Average cost per share
Total amount invested ÷ Total shares purchased. Your effective break-even price.
Averaging down
Buying more shares at a lower price to reduce your average cost per share.
Averaging up
Buying more shares at a higher price — increases average cost but adds to a winning position.
Unrealised P&L
Profit or loss based on the current market price vs your average cost, before you sell.
The formula
Weighted average cost
Average Price = Σ(Quantity × Price) / Σ(Quantity)
Sum of (quantity × price) for all purchases divided by total quantity gives the weighted average cost per share.
Worked example
Bought 100 shares at ₹500 and 150 shares at ₹400.
- Total invested = (100 × 500) + (150 × 400) = 50,000 + 60,000 = ₹1,10,000.
- Total shares = 100 + 150 = 250.
- Average price = 1,10,000 / 250 = ₹440.
✓ Average cost per share = ₹440. Break-even at current price ₹440.
Frequently asked questions
Average price calculations are for informational purposes only and not investment advice. Consult your broker or financial advisor for accurate cost-basis reporting.