What this currency converter does
This tool tells you how much an amount of money is worth when you move it from one currency to another: dollars to euros, euros to yen, or dollars to Dominican pesos. You type the amount, pick the source and target currencies, and the result appears instantly along with the exchange rate and the date it comes from.
The rates come from the European Central Bank (ECB), delivered through the free Frankfurter service. They are market reference rates: the mid-market price at which currencies trade between banks, with no fees or margins attached. That makes them ideal for understanding real value, even though they rarely match to the cent what your bank or a currency exchange actually charges you.
How to use it
- Pick the From currency (the one you hold).
- Pick the To currency (the one you want).
- Type the amount. The result updates on its own.
- Use the swap button to flip source and target in one click.
Below the result you will see the pair rate (for example, “1 USD = X EUR”), its inverse, and the date of the rates. You can copy the result with the button provided.
The calculation method
Converting between two currencies is a simple proportion. Every rate is quoted against the US dollar, so the math has two steps:
- First, turn the amount into dollars by dividing by the source currency’s rate.
- Then multiply by the target currency’s rate.
As a formula: result = amount ÷ source_rate × target_rate.
Worked example
Suppose you want to convert 250 USD into Dominican pesos and the day’s reference rate is T pesos per dollar. Since the source is already the dollar, the first step is skipped and you just multiply:
- result = 250 ×
T
If T were around 62 that day, you would get roughly 15,500 DOP; if it were 60, about 15,000 DOP. That is why we do not hard-code a number here: the rate changes every business day, and the tool always uses the most recent one available. For a pair without the dollar, such as euro to yen, the calculation first converts the euros into dollars and then those dollars into yen.
Reference table (example with 100 USD)
| Target currency | Sample rate | Approximate result |
|---|---|---|
| Euro (EUR) | 0.88 per USD | 88 EUR |
| Pound (GBP) | 0.75 per USD | 75 GBP |
| Mexican peso (MXN) | 17.5 per USD | 1,750 MXN |
| Dominican peso (DOP) | 62 per USD | 6,200 DOP |
The values in the table are illustrative; the tool uses the real rate of the day.
Frequently asked questions
Where do the rates come from?
From the European Central Bank, which publishes official reference rates every business day. We receive them through Frankfurter, an open and free service. The Dominican, Colombian, Argentine and Chilean pesos are not published by the ECB; for those the tool uses a static reference rate and says so clearly on screen.
Why does my bank give me a different rate?
Because the reference rate is a wholesale average with no costs baked in. Banks and exchanges add a margin (the “spread”) and sometimes fixed fees: they buy low and sell high, and that gap is their profit. A difference of several percentage points is normal, especially when buying cash.
How often are they updated?
The ECB sets its reference rates once per business day, around 16:00 Central European Time. There is no update on weekends or holidays, so you will see the last published rate. The exact date always appears under the result.
Can I use it to know what a transfer will cost?
As an estimate, yes. For the real cost, check with your bank or the transfer provider, because their margin and fees are added on top of the reference rate.