How the conversion works
The ECB expresses reference rates as units of each currency per euro. Tabel derives a cross-rate by dividing the destination rate by the source rate, then multiplying by your amount. EUR is the base at 1.
A worked example
With illustrative rates of 1 EUR = 1.20 USD and 1 EUR = 0.80 GBP, 120 USD becomes 80 GBP: 120 × 0.80 ÷ 1.20. These example rates explain the arithmetic; the calculator uses the dated ECB snapshot shown beside its result.
Source and date
Source: European Central Bank euro foreign exchange reference rates. The reference date and retrieval date are included with results and PDF downloads. The website ships a cached snapshot; it does not fetch rates live from the ECB while you use it.
ECB information is freely available from its website under its reuse conditions. Cross-rates are calculated by Tabel and labelled as derived.
Limits that matter
Reference rates are for information, not settlement. Bank spreads, fees and transaction dates can change the amount paid. The snapshot is not worldwide currency coverage; currencies such as KWD are absent. For any missing currency or negotiated rate, enter the actual rate in the comparison desk. No guessed parity is used.
Download the dated reference snapshot (JSON) · Browse the separate currency and territory registry.
Keep the whole comparison in view
Have several supplier spreadsheets? Open the comparison desk to map columns, review identity and preserve source evidence.