Averaging down lowers your cost basis — but how much can you add? See the max buy for your budget and target average.
Solve for the shares needed to hit any average.
Built for the "add to losers" decision.
Tweak the target and watch shares change.
Run through a typical scenario with the sample values below — hit See an example to load them instantly.
| Input | Sample value |
|---|---|
| Current Shares | 100 |
| Current Avg Price ($) | 120 |
| New Buy Price ($) | 80 |
| Target Avg Price ($) | 95 |
Follow the steps below to get accurate results.
Current Shares · e.g. 100Current Avg Price ($) · e.g. 120New Buy Price ($) · e.g. 80Target Avg Price ($) · e.g. 95Averaging down lowers your cost basis — but how much can you add? See the max buy for your budget and target average.
Max Buy Calculator is an interactive estimate built for quick planning. Always double-check the numbers that matter before acting on them, and reach out to a professional for personalized advice.
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Simply fill in the fields and press Calculate. Averaging down lowers your cost basis — but how much can you add? See the max buy for your budget and target average.
Just the basics — Current Shares and Current Avg Price ($) and New Buy Price ($), plus a few simple inputs. No account or signup is required; everything runs in your browser.
Yes — completely free, with no login, no watermarks and no limits. Bookmark it and share the URL with anyone who needs it.
The calculator uses current, standard formulas to produce an educational estimate. Real-world figures can vary based on your specific situation, so treat it as a planning aid rather than a final answer.
Absolutely. The tool is fully responsive and works smoothly on mobile, tablet and desktop browsers.
The result is an estimate for educational purposes only and is not financial, legal or tax advice. Consult a qualified professional before making important decisions.