How this calculator works
This calculator combines your current position with a new purchase to estimate the updated average cost per share.
New Average Cost = Total Invested ÷ Total Shares
What was added
The calculator also estimates your break-even price and the percentage move needed from the current market price to reach break-even.
How to use this calculator
- Enter realistic values that match your current situation.
- Press Calculate to refresh the estimate.
- Compare the main result with the supporting details in the result panel.
- Change one input at a time to see which variable affects the result most.
Planning note: Stock Average Cost Calculator gives an educational estimate. It does not include every tax rule, fee, platform policy, market condition, or personal constraint, so use it as a quick planning reference rather than a final decision.
FAQ
You can use this for stocks or ETFs. It does not include commissions unless you add them manually to your purchase cost.