Example

You get a loan for $770,000 with an interest rate of 6.875%. The term is 25 years.

Payments per year = 12
Years = 25
Interest = 6.875
Amount = 770000
Balance = 0

What's the monthly payment on the loan?

$5,380.95

Let's say you have the same loan (with the same interest rate, monthly payment, and term) but in addition there's a balloon payment (balance) due at the end of 25 years of $200,000.

Balance = 200000

What is the the loan payment?

$5,129.14