A currency converter you type into

Every example was run through Ratio 0.6.1 on 15 October 2026. Rates change with the market.

Type it the way you'd say it: “100 usd in eur”. Ratio knows 160+ currencies and the major cryptos, refreshes their rates on its own (hourly on the Mac, every few hours on Windows and Linux), and keeps working offline with the last ones it downloaded.

Convert in a single line

Calculate first, convert after

Name a value and reuse it, or mix currencies in a single line. Ratio converts each part before it adds them up.

Crypto, too

Rates from the past

Add a date, and Ratio uses that day's European Central Bank reference rate. Perfect for expenses and invoices.

On the Mac, it works in Terminal too: ratio "100 usd in eur". Every form is in the syntax reference.

Ratio runs on Mac, Windows and Linux with the same engine, so every example here gives the same answer on all three.

Try Ratio free for 7 days · $9.99 once, updates included

Questions

How do I convert currency on a Mac or PC without a browser? Open Ratio and type “100 usd in eur”. The answer appears beside the line.

Does the currency converter work offline? Yes. Ratio keeps the last rates it downloaded and refreshes them while you're online: every hour on the Mac (and when it wakes), every few hours on Windows and Linux.

Can I use an exchange rate from a past date? Yes. Add the date: “100 eur in usd on 1 jan 2024” uses that day's ECB reference rate.