What does the BGN-EUR Calculator for Merchants calculate?

The BGN-EUR Calculator for Merchants is an online tool specifically designed for merchants and businesses working during the transition period from Bulgarian lev to euro, which begins on January 1, 2026. The calculator helps you quickly calculate change in euros when a customer pays with a mixed payment - part in BGN and part in EUR. The calculator automatically converts BGN to EUR at the official fixed exchange rate (1 EUR = 1.95583 BGN) and calculates the exact change that must be returned to the customer only in euros. This tool is essential for merchants who need to handle mixed payments correctly and comply with the regulations during the transition period.

How to use the BGN-EUR calculator?

Using the calculator is very simple. Follow these steps:

Calculation steps:

1. Enter the total amount to pay in euros
2. Enter the amount paid in BGN (if any)
3. Enter the amount paid in EUR (if any)
4. Select the currency for change (EUR or BGN) - useful for daily reports
5. Click the "Calculate change" button
6. View the detailed result with all conversions in the selected currency

Why is this calculator important?

From January 1, 2026, Bulgaria enters a transition period during which Bulgarian lev and euro will be in parallel circulation. This means that customers can pay in both BGN and EUR, and merchants must return change only in euros. This calculator automatically converts BGN to EUR at the official fixed rate 1 EUR = 1.95583 BGN and calculates the exact change to return. New: You can now choose to view the change and total amounts in both euros and leva, which is especially useful for daily reports and accounting purposes.

How does the conversion work?

The calculator uses the official fixed exchange rate established by the European Council: 1 EUR = 1.95583 BGN. All BGN received from the customer are automatically converted to EUR at this rate, then added to the paid EUR to calculate the total paid amount. Finally, the total amount to pay is subtracted and the change that must be returned to the customer only in euros is obtained.

Usage example:

Frequently asked questions:

Sources and notes

The calculator uses the official fixed exchange rate of 1 EUR = 1.95583 BGN, established by the European Council for the transition period starting January 1, 2026. This rate will not change throughout the transition period. During the transition period, change is returned only in euros, according to the regulations of BNB and the European Central Bank. The calculator automatically performs all conversions with high precision, showing results rounded to the second decimal place as required for currency operations. For specific questions or complex cases, we recommend consulting with a bank, accountant, or BNB.

Last updated: January 13, 2026