Mortgage Calculator
The mortgage calculator takes certain inputs such as purchase price, down payment, and interest rate to determine the monthly mortgage payment. I recommend this calculator form bankrate.com.
Car Loan Calculator
Similar to the Mortgage calculator, the Car Loan calculator will use inputs, including your estimated credit score to calculate a payment. I recommend this one from nerdwallet.com
Student Loan Calculator
This calculator from finaid.org computes an estimate of the size of your monthly loan payments and the annual salary required to manage it.
Personal Loan Calculator
This calculator from from smartasset.com will calculate your personal loan payment and tell you how much you can save by paying extra.