Stock Average

The Stock Average Calculator computes the weighted average cost per share when you buy the same stock across multiple transactions at different prices — the foundation of any accurate portfolio tracking. Enter each buy transaction (quantity and price) and the tool returns the total shares held, total capital invested, and the average cost per share you can compare against the live market price to see unrealised profit or loss. The math is simple weighted averaging: average price = total money invested ÷ total shares owned. But the implications are large. When you average down (buy more of a stock after its price has fallen), your average cost drops and the price the stock needs to recover to for you to break even also drops. When you average up (buy more after a rise), your average cost rises and future gains come from a higher base. Neither is inherently better — it depends on your view of the company and the reason behind the price move. Averaging down works well when the price drop is driven by broad market volatility rather than a fundamental deterioration in the business. If the company's revenue, margins, and cash flow are intact and the stock is down because of a sector selloff or macro fear, adding at lower prices lowers your average and typically pays off when sentiment recovers. Averaging down works badly when the drop reflects real bad news — declining revenues, management issues, industry disruption. Then you're throwing good money after bad, a mistake behavioural finance calls "catching a falling knife". Systematic averaging — buying the same rupee amount every month regardless of price — is called Dollar-Cost Averaging or Rupee-Cost Averaging. It's essentially a manual SIP on individual stocks. Over 5–10 year horizons in quality companies, DCA typically outperforms lump-sum investing on a risk-adjusted basis because it removes the emotional pressure of timing entries and forces you to buy more when prices are low. Use the calculator to plan hypothetical buys: "if I add 100 shares at ₹450, what will my new average be?" Before every incremental buy, run the numbers and ask yourself whether you'd be equally comfortable adding at that price if you weren't already invested. That single question filters out most emotional averaging mistakes. Everything runs in your browser — no portfolio data is uploaded or logged. Combine this tool with the SIP Calculator for the mutual-fund equivalent, the Percentage Calculator for return math, and read our stock average and DCA guide for worked examples and common pitfalls.