The formula
How it works
Convert an amount from one currency to another using an exchange rate you supply. Enter the amount and the rate, and the calculator shows the converted total and the reverse rate.
FAQ
Where do I get the exchange rate?
From a bank, a currency website or a search — rates change constantly. Enter the rate as how many units of the target currency one unit of your currency buys; for example, if £1 = $1.25, enter 1.25.
Why isn’t the rate built in?
Exchange rates move every second and this calculator runs entirely in your browser without live data. Supplying the current rate yourself keeps the conversion accurate to the moment you look it up.
Why is the rate my bank gives me worse than the mid-market rate?
Banks and card networks typically quote the mid-market rate online but add a markup or fee when they actually convert your money, so the rate you are charged is usually a little less favorable.
What does the reverse rate tell me?
The reverse rate is simply 1 divided by the rate you entered, showing how many units of your original currency one unit of the target currency is worth — handy for converting back the other way.
Can I use this to convert the target currency back to the source?
Yes — swap the amount for the converted total and enter the reverse rate shown, or just divide the converted amount by the original rate to get back to the source currency.
Why do my results have so many decimal places?
Exchange rates are often quoted to four or six decimal places because small fractions add up on large amounts, so the calculator keeps that precision rather than rounding too early.
Does the calculator remember or fetch rates automatically?
No — it performs no lookups and stores nothing; every conversion uses only the amount and rate you type in at that moment, so it works the same offline as online.
About the currency calculator
This calculator converts money from one currency to another using an exchange rate you enter. Because rates change by the second, it does not try to guess them — you look up the current rate and the calculator does the arithmetic, showing the converted amount and the reverse conversion. It is a quick, reliable way to work out prices, budgets and payments in a foreign currency.
How to use it
Enter the amount you want to convert, then the exchange rate — how many units of the target currency you get for one unit of your own. The calculator shows the converted total, along with the rate the other way round. For example, 100 units at a rate of 1.08 converts to 108, and the reverse rate of about 0.926 tells you how to convert back.
The formula
The conversion is simply the amount times the rate, . To go the other way, divide instead — or use the reverse rate, which is . Bear in mind that banks and exchange services usually add a margin or fee to the mid-market rate, so the rate you actually get may be a little worse than the one you look up.
Where it is used
Travellers use it to budget for a trip and check prices abroad, online shoppers use it to compare foreign listings, and freelancers and businesses use it to convert invoices and payments. Because it works from any rate you enter, it handles any pair of currencies. Pairing it with a live rate source gives an up-to-the-minute conversion for spending, saving or getting paid across borders.