Educational tool: calculations are illustrative and are not investment advice or predictions.
Stock returns

Stock Average Calculator

Calculate the weighted average price and total investment after buying more shares.

Free to useNo account requiredPrivate by defaultInputs stay in your browserTransparentFormula shown below

Formula-based educational calculator · Tested with worked examples · View methodology

Enter your scenario

Example values are pre-filled. Replace them with your own.

How this calculator works

Weighted average, not simple average

When purchase quantities differ, adding the two prices and dividing by two is incorrect. This calculator weights each price by its quantity.

Averaging down carries risk

A lower average price does not improve the company or guarantee recovery. Recheck the investment thesis and total portfolio exposure before adding capital.

How average share price is calculated

The weighted average uses both price and quantity. A small purchase at a very different price does not affect the average as much as a large purchase. Purchase fees may be included so the result reflects total cost rather than quoted prices alone.

Averaging example

Buying 100 shares at ₹500 and another 100 at ₹450 creates 200 shares with a ₹475 average before fees. Buying more below the current average reduces the average cost, but also increases total money at risk. Use the current-price field to inspect unrealised P&L; it does not predict whether averaging is a good decision.

Frequently asked questions

Can this result predict a trade?

No. It only applies a formula to your assumptions. Market prices, fills, fees and outcomes can differ.

Does TradeCalcZen store my values?

Calculations stay in your browser. Turn on Remember my inputs to save a scenario locally; turn it off to remove that saved scenario. No calculator values are sent to our servers.

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