Stock Average Calculator
Calculate a new average cost basis after buying additional shares at a new price.
New Average Cost
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Total Shares
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Total Cost Basis
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New Purchase Cost
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Guide
How it works
Use this calculator to find your new average stock cost after buying more shares.
What this calculator does
The stock average calculator combines your current shares and average cost with a new purchase.
Stock Average Formula
Average Cost = Total Cost Basis / Total Shares
Example calculation
If you own 100 shares at an average cost of 40 and buy 50 shares at 32, the calculator estimates your new average cost.
When to use this calculator
- averaging down
- averaging up
- tracking cost basis
- planning additional purchases
FAQs
Is average cost the same as tax basis?
It can be related, but tax basis rules vary. This calculator is a planning estimate.
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