通貨コンバーター
透明で日付入りの為替レートスナップショットを使って主要通貨を換算します。
この計算機について
米ドル、ユーロ、英ポンド、日本円、人民元など主要通貨を、透明な為替レートスナップショットで換算します。レートを取得した日時を明示し、古くなると警告するため、その数値を信頼してよいか常に判断できます。レートは静的なスナップショットであり、リアルタイムの市場データではありません。
How to use the currency converter
- Enter the amount you want to convert.
- Choose the currency you are converting from and the one you are converting to.
- Read the converted amount and the exchange rate used.
- Check the snapshot date — if a stale warning appears, treat the result as an estimate.
一般的な例
- 100 USD → EUR、スナップショットレート 0.92 → €92.00
- 50 GBP → USD（基準通貨経由のクロスレート）≈ $63.29
- 10,000 JPY → USD、1ドル=157.2 ≈ $63.61
- 250 EUR → GBP ≈ £214.67
- 1 USD → CNY、スナップショットレート 7.24 → ¥7.24
よくある質問
Are these exchange rates live?
No. The converter ships with a static, dated snapshot of representative rates so it works reliably offline and without a paid data feed. The page always shows the snapshot date and warns when the rates are stale. A live data source is a planned future addition.
Why does it warn that the rates are out of date?
The snapshot has a fixed capture date. When that date is older than the freshness threshold, the converter shows a warning so you treat the result as an approximation rather than a real-time quote.
How is a cross rate between two non-USD currencies calculated?
Every rate is stored relative to a common base (USD). To convert from one currency to another, the tool divides the destination rate by the source rate, so the base cancels out and the math stays exact.
Can I share a specific conversion?
Yes. The amount and both currencies live in the URL, so copying the address bar reopens the exact same conversion for anyone who clicks the link.