Reference number calculator
With the reference number calculator you can calculate reference numbers to your invoices. As the basis of the reference number you can use the customer number or the invoice number.
The minimum length of a reference number is four characters (basis 3 characters + control number) and the maximum length is 20 characters (19 + 1).
Fill in the fields requested by the calculator and you get a list of the reference numbers.
The function 'international references' creates RF references for international use based on a Finnish reference number (choice Y = yes, choice N = no).