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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.
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.