Cost Basis / Average Down Calculator
Blended average cost after adding to a position.
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New average cost
$40.00
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Short answer
Blended average cost after adding to a position.
What is the Cost Basis / Average Down Calculator?
Blended average cost after adding to a position.
How does the Cost Basis / Average Down Calculator work?
Enter the inputs above and read the result.
Formula
Variables
S,PShares and price of each lot
Explanation
Averaging down lowers the breakeven price when buying more shares at a lower price.
Examples
Applications
Advantages
Limitations
Common mistakes
Tips
Related concepts
The Cost Basis / Average Down Calculator sits inside the Finance Calculators hub, in the investing & retirement cluster. Growing capital and planning for withdrawal. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Cost Basis / Average Down
Blended average cost after adding to a position. Within finance calculators, cost basis / average down belongs to the investing & retirement cluster, where it shares terminology and assumptions with closely related tools.
Learning how cost basis / average down is calculated
Averaging down lowers the breakeven price when buying more shares at a lower price. Working through the variables one at a time — S,P — makes the result reproducible by hand and easier to sanity-check.
Using cost basis / average down to make a decision
Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How cost basis / average down compares with related measures
compound growth, asset allocation, withdrawal rate, yield all describe adjacent aspects of investing & retirement. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
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