How it works
When you change the source currency, we fetch the latest rates for that base from exchangerate.host's public API. The rate table is stored in sessionStorage so subsequent conversions in the same tab do not re-fetch.
FAQ
Where do the rates come from? exchangerate.host — a free public API with no API key required. They aggregate rates from multiple central bank sources. Rates update roughly every 60 minutes.
How fresh are the rates I see? We cache rates in your browser's sessionStorage for 1 hour to avoid hammering the API. If the API is unreachable, we fall back to the last cached rates and show a "rates may be stale" notice.
Are these the rates I will get at my bank? No. The interbank/mid-market rates shown here are what banks see between themselves. Retail customers typically pay 1–3% above the mid-market rate as a margin. Use these rates for estimation, not for exact bank transactions.