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Average down calculator (average cost)

Work out the average purchase price of a stock you bought in several lots, and your current return. The second part shows how many more shares you need to reach a target average cost.

Average down calculator

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Total shares–
Total invested–
Average cost–
Market value–
Unrealized P&L–
Return–

Reach a target average cost

Shares to buy–
Extra cash needed–

How it works

Average cost = total amount invested ÷ total shares. Buying 100 shares at 10,000 and 100 shares at 8,000 gives (1,000,000 + 800,000) ÷ 200 = 9,000.

Shares needed for a target average

Additional shares = current shares × (current average − target average) ÷ (target average − new buy price). The target must be above the new buy price and below your current average.

Before averaging down

A lower average does not help if the reason for the decline persists — it only enlarges the position. Set a maximum position size first. Fees and taxes are not included.