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Investment calculator
Calculate a new stock average cost from current shares and cost basis plus an additional purchase.
Compare your investment and weighted average price before and after an additional purchase.
How to read these results
These values are calculated from your current inputs. Check the input units and this calculator’s stated assumptions or included scope alongside the results.
Primary result: New average price
Supporting value: Total shares
Use the result for your next decision
Compare the primary result with your target or another option, then change only the conditions you want to test and recalculate. Before acting, also check the calculator-specific guidance and applicable conditions.
Keep up to three calculated result snapshots only for this page session and compare them with the current result. Inputs, URLs, and browser storage are not used.
Shares only the calculator name and displayed result summary. Inputs and URLs are not included or stored.
Uses your browser’s print feature without uploading or automatically saving your inputs or results.
A simple weighted average excluding fees, taxes, and currency conversion.
Calculate to see the new average price and total investment.
Yes. Fractional stock or crypto quantities are supported.
Use each calculated total quantity and average price as the current holding for the next purchase.
No. Your broker's actual cost basis can include fees and other adjustments.
Yes. The same quantity-weighted calculation applies when averaging up.