Simulator or calculator?
A calculator solves one exact question, like the BMI for a given height and weight. A simulator plays out a scenario over months or years, so you can compare paths side by side, such as a 15-year versus a 30-year mortgage. For one-off math, the calculators are the faster pick.
Results are estimates based on the rates you enter. The real terms of a loan depend on your credit, lender fees, insurance and local taxes.
Popular simulators
The mortgage calculator breaks a home loan into principal, interest and the full payoff schedule, and the auto loan calculator does the same for a car. If a balance is growing, the credit card payoff calculator shows how long it takes to reach zero at a given monthly payment.
Weighing a purchase? Try rent vs buy. Planning ahead? The FIRE calculator estimates how much you need to retire early, and the amortization calculator shows how each payment splits between interest and principal on any loan. For a simple personal loan, use the loan calculator.
Frequently asked questions
Are the simulators official quotes?
No. They use the rates and terms you enter and are meant for comparing scenarios. A real loan depends on your credit and on each lender's conditions.
Do I need to enter my Social Security number or personal info?
No. No personal data is requested, and nothing you type leaves your browser.
What is APR, and should I enter it?
APR is the yearly cost of borrowing, including interest and certain fees. Enter the rate on your loan offer, and compare offers using APR rather than the interest rate alone.
What is amortization?
Amortization is paying a loan off in regular installments. Early payments go mostly to interest, and later ones go mostly to principal.
Can I use the result to decide on a loan?
Use it as a reference to compare and negotiate, then confirm the final terms in writing with the lender.