This currency converter multiplies an amount by an exchange rate you enter or by a daily rate fetched from the Frankfurter public API. Manual mode works offline and makes the conversion assumption completely transparent.
How to use this calculator
Select source and target currencies. In manual mode, enter how many target-currency units equal one source unit. In daily-rate mode, the tool requests the selected pair and displays the provider date. If the request fails, enter a manual rate instead.
Formula & calculation method
Converted amount = source amount × target units per source unitThe same formula applies in both modes; only the source of the rate changes. Daily rates are not real-time trading quotes. No rate is hardcoded or invented, and a failed network request never produces a fabricated conversion.
Worked example
If one source unit equals 0.90 target units, an amount of 100 converts to 90 target units. If your quoted rate is expressed in the opposite direction, invert it before entering or swap the currencies.
Why this is useful
Manual mode is useful for invoices, historical conversions, or a rate supplied by a bank. Daily mode reduces manual entry when an approximate current reference is sufficient, while source and date information keep the result interpretable.
Limitations to keep in mind
Banks and payment services may use different rates and add spreads or fees. Daily reference rates can lag market movements and may be unavailable on some days. The converter does not execute transactions or guarantee a dealing price.
Frequently asked questions
Why is manual mode the default?
It keeps the tool usable without a network connection and ensures you always know exactly which exchange rate produced the result.
Are daily rates live trading prices?
No. They are daily reference data, not executable bid or ask prices, and may differ from a bank or card provider quote.
What happens if the rate service is unavailable?
The calculator displays an error and keeps the manual-rate option available. It never fills in an assumed market rate.