Stock Average Cost Calculator
Find your average cost per share after buying a stock, ETF or coin at different prices — and the price you need to break even.
For information and education only — not financial advice. Results are estimates based on the numbers you enter; check important decisions with a qualified professional.
How to use
- 1Enter each purchase as 'shares price' on its own line.
- 2Add the current price to see your gain or loss.
How it's calculated
Average cost = total spent ÷ total shares = Σ(shares × price) ÷ Σ shares.
Frequently asked questions
What is averaging down?
Buying more shares after the price falls, which lowers your average cost. It only helps if the price recovers.
Should I include fees?
Yes, for your tax cost basis. Add each purchase's commission to its total, or enter a slightly higher price.
Does this work for crypto?
Yes — fractional quantities work the same way.