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Investing
Combine an existing foreign-currency position with an additional purchase to calculate the new weighted average exchange rate and total cost basis.
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 exchange rate
Supporting value: Total cost basis
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.
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This calculator does not fetch live FX rates or perform conversion. Enter rates as payment-currency units per 1 unit of foreign currency. Spreads, exchange fees, and taxes are excluded.
It multiplies each foreign-currency amount by its exchange rate to get cost basis, adds the existing and additional costs, and divides the combined cost by the combined foreign-currency amount.
The rate actually applied by a bank, broker, or card provider can differ from a reference market rate. Use the applied transaction rate from your records for a closer cost-basis estimate.