Rate History
Not enough data to draw the chart.
Why traders use this tool
- Compare ECB mid-market rates with Open ER API to spot anomalies.
- Share the converted result via URL or save it to your CalcBE favorites.
- Keep working even when offline thanks to cached quotes with timestamp labels.
How to use this currency converter
Choose the amount, base currency, target currency, and data source, then read the converted amount together with the inverse rate and last update time. Use the history window to see whether today's quote is near the recent high, low, or average.
What the result means
The main line shows the converted amount for the current quote. The secondary lines show the direct rate, inverse rate, timestamp, and source label so you can tell whether you are looking at a fresh live quote or a cached fallback.
When to switch sources
ECB via Frankfurter is useful when you want a stable reference quote for major currencies. Open ER API is helpful when you need broader coverage or a fallback source. If both sources disagree, compare the update time before treating the difference as meaningful.
Common mistakes to avoid
- Comparing the app result with a bank or card charge without allowing for spreads and fees.
- Reading a cached fallback as if it were a fresh live quote.
- Forgetting that history shows the selected source and selected pair only.
- Sharing the URL without confirming the amount, source, and history window you want others to reopen.
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FAQ
Where do the exchange rates come from?
You can switch between the European Central Bank feed served by Frankfurter and the free Open ER API. Both expose HTTPS endpoints with reference market data, not the final spread or fee applied by your bank.
What happens if the API request fails?
The app can reuse the most recent successful quote stored in your browser. When that happens, the result is shown with a cache notice so you can see that the number is a fallback rather than a fresh live fetch.
Why is my bank or card rate different?
Banks, card issuers, and payment processors often add a spread or a fixed fee on top of the reference quote. Treat this tool as a planning reference and confirm the final transaction rate with your provider.
What does the history window show?
The history panel summarizes the selected source, currency pair, and lookback window only. It is useful for spotting recent highs, lows, and average levels, but it is not a trading chart or a forecast.
What does the shareable URL keep?
The copied link preserves the amount, base currency, target currency, source, and history window so the same setup reopens on another device. It does not freeze the live rate itself, so a future visitor may see a newer quote.
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How it’s calculated
- Rates come from your selected source (ECB Frankfurter or Open ER API). If a live fetch fails, the app uses the last cached rate and shows its timestamp.
- Direct pairs convert as amount × rate. When a direct quote is not available, a cross via a reference currency (for example EUR) is used to preserve consistency.
- No spreads or fees are applied here; this is mid‑market pricing for educational use. Your bank/card may differ.
- The shareable URL captures the amount, currencies, source, and history window so you can reproduce the same result later.
Exchange rates change rapidly. Always double-check critical transactions with your bank or card issuer. This calculator is provided for informational purposes only.