Currency Converter
100% private — runs on your device, never uploaded. Works offline once loaded.
Convert an amount between any two of 150+ world currencies using live exchange rates fetched once and cached for your session. The conversion itself runs in your browser.
How the conversion works
This tool loads a full table of exchange rates a single time when you open the page, then does every conversion locally with simple arithmetic. Because all rates are quoted against a common base currency, converting from any currency to any other is a two-step ratio: the amount is effectively normalised to the base and then multiplied into the target. In formula terms, converted = amount × (rate_to ÷ rate_from), which is why you can freely switch either currency without refetching anything.
Fetching once and caching in memory keeps the tool fast and light. After the first load, changing the amount or swapping currencies is instant, and no further network calls are made for the rest of your session.
What the rate actually represents
The figures shown are mid-market (interbank) reference rates — the midpoint between the buy and sell price that large institutions quote each other. They are the fairest single number to describe what a currency is worth, which is why news sites, spreadsheets, and finance tools use them.
What you are quoted by a bank, airport kiosk, or card network is not this number. Those providers add a spread and sometimes a fixed fee, so a real transfer usually lands a percentage or two below the mid-market rate. Treat the result here as the honest benchmark to compare offers against, not the exact amount that will hit your account.
Good ways to use it
A currency converter earns its keep in everyday situations: sizing up a price while shopping on an overseas website, splitting a holiday bill, sanity-checking an invoice quoted in a foreign currency, or estimating freelance income paid from abroad. The swap button makes it easy to flip the direction when you realise you had it backwards.
- Compare a supplier or marketplace price against your home currency before buying.
- Estimate how much foreign cash to carry before a trip.
- Check whether a money-transfer service's rate is close to the mid-market benchmark.
- Convert quoted salaries or invoices when working with international clients.
Frequently asked questions
How often are the rates updated?
The source publishes fresh rates roughly once a day. The tool shows the last-update timestamp it received, and reloading the page pulls the newest set.
Which currencies are supported?
Around 150 currencies are available, including all major ones such as USD, EUR, GBP, JPY, INR, AUD and CAD, plus many smaller national currencies.
Why is the rate slightly different from my bank?
The tool shows mid-market rates. Banks and card networks apply a margin on top and may charge fees, so their effective rate is usually a little worse.
Does it work offline?
It needs one internet connection to fetch the rate table when the page loads. After that, conversions run locally, but you cannot get updated rates without a connection.
Is my amount or data sent anywhere?
No. Only the public rate table is downloaded. The amount you type and the conversion math stay entirely in your browser.
What does the exchange rate line mean?
It shows how many units of the target currency one unit of the source currency buys, so you can apply it to any amount yourself if you like.
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