Blog
The European Central Bank mid-market rate is the most widely used reference rate for recording multi-currency transactions. You can check it here for 32 currencies, free, with no account. The rate updates daily by 4 PM CET, and the converter shows the exact ECB date stamp on every conversion.
If you do multi-currency bookkeeping — whether for a client with overseas revenue, a business paying foreign suppliers, or a non-profit receiving international donations — you need a consistent, auditable rate source. The ECB mid-market rate is that source for most accounting frameworks.
When you record a transaction in a foreign currency, accounting standards (both GAAP and IFRS) generally require the "spot rate" on the transaction date. The spot rate is the current exchange rate — and the mid-market rate is the closest publicly available approximation.
The key distinction for accountants:
| Rate Type | What It Is | When to Use It |
|---|---|---|
| Mid-market (ECB reference) | True interbank rate, zero markup | Recording transactions, revaluing balances, financial statements |
| Bank transaction rate | Mid-market + bank margin (1-3%) | Reflects actual cost of a specific transfer (may differ from recorded rate) |
| Credit card rate | Mid-market + card network spread | Expense reporting — record the amount your card was actually charged |
| PayPal/processor rate | Mid-market + 2.5-3.5% markup | Record the received amount, book the difference as FX cost |
Your books should reflect the mid-market rate for the transaction itself. The difference between what you recorded and what you actually received or paid is an exchange gain or loss — a separate line item. If you are recording a $10,000 invoice and the bank charges 2% over mid-market, you record $10,000 at the mid-market rate and book the $200 bank spread as a foreign exchange cost.
For creating the invoice itself, our invoice generator lets you build professional invoices with line items, taxes, and payment terms — then download as PDF. Pair it with the currency converter to price the invoice accurately.
At month-end, you revalue all foreign currency balances (receivables, payables, bank accounts denominated in foreign currency) using the ECB rate from the last business day of the month. The difference between the previously recorded rate and the month-end rate gets booked as an unrealized exchange gain or loss.
Example: You invoiced €50,000 to a German client on March 10 at a rate of 1 EUR = 1.0850 USD (booked as $54,250). By March 31, the rate has moved to 1 EUR = 1.0920 USD. The receivable is now worth $54,600. You book an unrealized gain of $350.
The converter shows the ECB date on every conversion, which gives you a clear audit trail. Screenshot or note the rate and date for your workpapers.
You bill clients in EUR but report in USD. Every invoice needs to be recorded at the USD equivalent using the ECB rate on the invoice date. Payments arrive days or weeks later at a different rate. The difference is booked as realized exchange gain or loss on settlement.
On a $500K annual European revenue stream, even a 1% rate movement between invoicing and payment means $5,000 in exchange gains or losses that need proper recording. This is not rounding error — it hits your P&L.
You hire developers in India (INR), a designer in the UK (GBP), and a translator in Brazil (BRL). Each contractor payment needs to be recorded at the mid-market rate on the payment date. If you pay through PayPal, the amount your bank sends and the amount the contractor receives will differ from the mid-market rate — PayPal takes 2.5-3.5%. Record the mid-market equivalent and book PayPal's spread as a transaction cost.
Donations arrive in multiple currencies. Each donation needs recording at the mid-market rate on the date received. For year-end reporting, revalue any held foreign currency at the December 31 rate. If you track donor contributions by country, the converter handles the most common donation corridors: GBP, EUR, CAD, AUD, CHF to USD.
Check ECB mid-market rates for your multi-currency bookkeeping.
Open Currency Converter →Auditors want to know where your exchange rates come from. "I Googled it" is not a satisfactory answer. The European Central Bank is a recognized rate source that auditors accept globally. When you use the converter:
For a more formal audit trail, take a screenshot showing the rate, date, and ECB source label. Some firms paste these into their workpapers or reconciliation files.
The converter covers 32 currencies, including every major business currency:
If your practice handles clients with transactions in currencies not on this list, you will need a broader source like XE or the relevant central bank's own published rates. For the 32 currencies covered, this tool gives you the same ECB data that banks use internally.
Multi-currency accounting often overlaps with other financial calculations. If you are preparing financial models or client reports, these might save some time:
For the full guide on how the converter works and a comparison against other free tools, see our complete currency converter guide.