Currency Converter
Currency Converter works out Converted amount and Result from Amount, From currency and To currency. The default figures on this page give converted amount of 86.27; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
4 steps
- Rate: 1 USD = 0.862664 EUR (Rate entered by the user).
- Applied directly, USD to EUR.
- No spread applied.
- 100 x 0.862664 = 86.27 EUR, rounded to the 2 minor-unit digits ISO 4217 gives EUR.
Figures from ISO 4217 currency list, checked 31 August 2026. Its 6 worked examples are re-run on every release, last on 15 September 2026. What changed · how reference data is kept current
Sources and references
4 sources
What the Currency Converter calculates
Converts an amount between currencies at a supplied or provider-sourced exchange rate, applies the bank spread and any fixed fee, and rounds to the target currency's official ISO 4217 minor units. Euro legacy currencies and treaty-pegged currencies use their legally fixed rates.
How to use this Currency Converter
Enter Amount, From currency, To currency and Exchange rate (from your bank or a rate feed). Converted amount updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Converted amount, Result and Rate actually applied.
The method follows ISO 4217 Currency codes, list one (current currency and funds code list), Council Regulation (EC) No 2866/98 on the conversion rates between the euro and the currencies of the Member States adopting the euro, Council Regulation (EC) No 1103/97, Articles 4 and 5 - triangulation through the euro and rounding rules and European Central Bank, the euro: irrevocable conversion rates.
250 pounds at a bank rate of 1.27 dollars to the pound example
With Amount: 250, From currency: GBP, To currency: USD, Exchange rate (from your bank or a rate feed): 1.27, the calculator returns Converted amount: 317.5, Rate actually applied: 1.27, Inverse of the applied rate: 0.787402. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Converted amount, Result and Rate actually applied. The inputs you can vary are Amount, From currency, To currency, Exchange rate (from your bank or a rate feed), The rate I entered is and Bank or card spread on the rate.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How do I calculate a currency conversion?
Converts an amount between currencies at a supplied or provider-sourced exchange rate, applies the bank spread and any fixed fee, and rounds to the target currency's official ISO 4217 minor units. Open “How this is worked out” beside the result to see each step for your own figures.
How to currency conversion calculator?
It needs Amount, From currency, To currency, Exchange rate (from your bank or a rate feed), The rate I entered is and Bank or card spread on the rate. Nothing else is required, and the figures stay in your browser.
What information do I need for the Currency Converter?
You need Amount, From currency, To currency, Exchange rate (from your bank or a rate feed), The rate I entered is, Bank or card spread on the rate, Fixed fee, in the source currency and Allow codes that are not on the ISO 4217 list. The page opens with default figures that give converted amount of 86.27, so you can see the scale before entering your own.
What does this Currency Converter show?
It shows Converted amount, Result, Rate actually applied, Rate before any spread, Inverse of the applied rate, Total cost of the spread and fees, in the target currency, Decimals in the target currency and From, with the working and any warnings for your entries.
Can I check how the Currency Converter result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.