How to Use the FX Spread Cost Calculator
Buying international stocks — European or Asian shares, for example — usually means converting dollars into a foreign currency first, and brokers add a spread on top of the mid-market exchange rate during that conversion. Even with a preferred-rate discount, part of this markup often remains, so the foreign currency you actually receive always comes in a bit below the ideal, spread-free amount.
This calculator multiplies your conversion amount by the spread rate to find the dollar cost, then divides the remaining amount by the exchange rate to show the foreign currency you actually receive. It also compares that to the ideal amount you'd get with zero spread, showing your loss in foreign currency units.
Spreads vary significantly between brokers and conversion methods, so comparing FX rates across providers or converting a larger amount in one transaction rather than several small ones can meaningfully reduce your cost. Since the same spread percentage costs more in absolute dollars as your conversion amount grows, it's worth checking this cost before converting a large sum.
Frequently Asked Questions
It's the markup a broker or bank adds on top of the mid-market exchange rate. Even with a preferred-rate discount, part of this markup usually remains, so the foreign currency you actually receive is always a bit less than the ideal amount.
Compare FX rates across brokers, since spreads vary, and converting a larger amount at once often gets a better rate than several smaller conversions. Some brokers also offer fee-free or reduced-spread conversion for certain international trading accounts.
Yes. Since the spread is usually a percentage of the amount converted, and some brokers also apply a minimum fee, converting small amounts frequently can end up costing more relative to your total than converting a larger sum at once.