Currency Converter
Enter an amount, pick the currency you have and the currency you want to see it in — the result updates live using current exchange rates.
How Currency Converter Works
This currency converter turns an amount in one currency into its equivalent in another, using exchange rates fetched live from an external rate provider when the page loads. Pick the currency you have, the currency you want to see it in, and the converted amount updates instantly as you type.
Formula & Method
On load, the tool fetches a full table of exchange rates against the US Dollar (USD) from the open.er-api.com API. To convert between any two currencies from and to, it computes a cross rate as rate = usdRate[to] ÷ usdRate[from], then multiplies your entered amount by that rate: converted = amount × rate. Because every rate is derived from the same USD table, this works for any currency pair the API supports, not just conversions to or from USD.
Worked Example
Say you want to convert 20 USD to INR and, at the moment you load the page, the live table shows 1 USD = 83 INR (illustrative -- the real number moves with the market and is whatever the API returns at that instant). The cross rate for USD → INR is 83 ÷ 1 = 83, so 20 × 83 = ₹1,660.00 is shown as the result, along with a "1 USD = 83.0000 INR" note underneath.
Frequently Asked Questions
- How often are the exchange rates updated?
- Rates are fetched once when you load the page, from open.er-api.com, which refreshes its own data roughly once a day. The page shows the provider's "last updated" timestamp under the result so you can see how current the rates are.
- What happens if the exchange rate data can't be loaded?
- If the request to the rate provider fails -- for example, no internet connection -- the result shows "Unavailable" along with a short message asking you to try again shortly, rather than showing a stale or incorrect number.
- Can I convert between two non-USD currencies, like EUR to JPY?
- Yes -- all rates are stored relative to USD internally, but the tool computes a cross rate between any two currencies you pick, so converting EUR to JPY (or any other pair) works the same way as converting to or from USD.
- Is this rate exact enough for sending money or trading?
- These are indicative market exchange rates meant for quick estimates -- banks, card networks, and money transfer services add their own markup and fees on top, so the amount you actually pay or receive will differ somewhat from this calculator's figure.