Formula & assumptions
When you calculate in latest-rate mode, the browser requests the selected currency pair from Frankfurter using ECB reference data. The entered amount and fee are not sent with that request. The result displays the rate’s date and source; rates are daily references, not live executable quotes. Manual mode works without a network request. Banks and card issuers may apply a spread, fixed charge or another rate.
Worked example
With a manually entered rate of 1.10 target units per source unit, 100 becomes 110 before fees. A 2% proportional fee leaves 107.80. This example rate is illustrative and does not represent today’s market.
How to use this calculator
- Select source and target currencies and enter the amount.
- Choose latest reference data or enter a known rate yourself. Add an optional percentage fee.
- Calculate and check the displayed date, source and fee assumptions before using the estimate.
Frequently asked questions
Is the rate live?
No. ECB reference rates are normally published on working days. Weekends and holidays can show the previous published date.
What happens if the rate service is unavailable?
An error is shown and no old result is presented as fresh. You can retry or switch to manual mode and enter your own rate.
Is the result what my bank will pay?
No. Reference rates differ from bank buy/sell quotes. Only the entered percentage fee is modeled; fixed charges and spreads are excluded.