The calculators on Bankmatch turn an amount, a rate and a term into a monthly payment and a total-interest figure. They are a sketch for Deutschland, not a lender quote and not a credit check.

Which tool to open

Personal loan calculator — unsecured instalments; pair it with live personal-loan offers.
Mortgage calculator — home-secured borrowing; then compare mortgages.
Car finance calculator — price, deposit and term; then car finance.

The rate you type is an assumption. Replace it with the eff. Jahreszins on a written offer before you decide. How to use the loan calculator covers the usual mistakes. When the numbers look plausible, match against live products.