Currency Exchange Calculator

About Currency Exchange Calculator

Exchange rates fluctuate constantly. Banks and services add markup. Use mid-market rate for fair comparison.

How to use this calculator

1. Enter the amount you want to convert in the starting currency.
2. Type in the exchange rate, which tells you how many units of the target currency equal one unit of the source currency.
3. Check the converted amount shown by the calculator.
4. If needed, reverse the conversion by swapping the currencies and using the inverse rate.

The formula explained

The formula \(amount_{to} = amount_{from} \\times rate\) computes the converted amount in the target currency. It multiplies the original amount by the exchange rate to find its value in the new currency.

• \(\text{amount}_{from}\) = the amount of money you start with
• \(\text{amount}_{to}\) = the amount of money after conversion
• \(\text{rate}\) = the exchange rate used for the conversion

Step by step method

1. Write down the starting amount and the exchange rate.
2. Multiply \(amount_{from}\) by \(rate\) to get \(amount_{to}\).
3. Check the units to make sure the result is in the target currency.

Worked example

Problem. Convert \(50\) US dollars to euros using an exchange rate of \(0.92\) euros per dollar.

1. Start with \(amount_{from} = 50\) and \(rate = 0.92\).
2. Compute \(amount_{to} = 50 \\times 0.92 = 46\).
3. The converted amount is \(46\) euros.

Tips and common mistakes

• Make sure the exchange rate matches the direction of conversion, from source currency to target currency.
• Watch for fees or rounding, since real exchange services may give a slightly different final amount.

Frequently asked questions