DocomintCurrency Converter
Convert between 20 major currencies using live, daily-updated exchange rates.
What is a Currency Converter?
The one calculator in this catalog that isn't purely offline — everything else here runs entirely on formulas, but a currency conversion is only as good as its exchange rate, which changes daily. This fetches a live mid-market rate at the moment you convert, rather than a stale hardcoded table.
How to use the Currency Converter
- Enter an amount and choose the currencies to convert from and to
- Press Convert
- The converted amount and current exchange rate are fetched live and shown instantly
Formula
Converted amount = Amount × exchange rate(from → to)
The exchange rate is fetched live at the moment you convert from a public rate API, not looked up from a hardcoded or cached table.
Example
Converting $100 USD to EUR at a live rate of roughly 0.92 returns about €92 — the mid-market rate shown here is typically a bit better than what a bank or card network actually applies, since those add their own markup on top.
Common mistakes
- Treating the mid-market rate shown here as the exact rate a bank, card network, or currency exchange counter will actually give you — those add their own markup on top.
- Assuming the rate updates continuously in real time rather than roughly once per day, as is typical for a free exchange-rate feed.
- Forgetting the rate direction matters — the USD→EUR rate is the mathematical reciprocal of the EUR→USD rate, not the same number.
Frequently asked questions
Where do the exchange rates come from?
A free, publicly available exchange rate API (open.er-api.com), updated roughly once per day. Rates are fetched live at the moment you convert, not cached indefinitely.
Is this the rate I'll actually get at a bank or when using my card abroad?
No — this shows the mid-market rate (the rate banks trade at among themselves), which is usually better than what you'll get from a bank, card network, or currency exchange counter, since those add their own markup or fee on top.
Which 20 currencies are supported?
USD, EUR, GBP, JPY, INR, AUD, CAD, CHF, CNY, PKR, AED, SGD, ZAR, BRL, MXN, NZD, SEK, NOK, KRW, and HKD — the major currencies most commonly needed for everyday conversions and travel.
Why did the rate change since I last checked?
Exchange rates float continuously in real markets and this tool's feed refreshes roughly once a day, so a rate checked yesterday and today can genuinely differ — it isn't a bug, just normal currency market movement.
Is my numbers uploaded anywhere?
No — Currency Converter runs entirely in your browser using JavaScript/WebAssembly. Your numbers is never sent to a server.