Estimate payments and total interest for mortgages, personal, auto, student, and business loans, including extra payments and refinancing.
Every calculation stays in your browser
Calculation summary
Extra payments shorten the term while keeping the scheduled payment unchanged.
Original planWith extra payments
This estimate applies monthly interest to the outstanding principal and rounds each payment. Your lender may use daily interest or different fee, tax, and prepayment rules.
Full amortization schedule
See principal, current and cumulative interest, extra payments, penalties, and remaining balance for each month.
Month
Date
Rate
Starting balance
Scheduled payment
Principal
Interest
Cumulative interest
Extra principal
Penalty
Total payment
Ending balance
Which loans can this calculator estimate?
Use it for loans that charge interest on the outstanding balance and repay principal in regular monthly installments.
Mortgage and home loans
Estimate long-term payments, interest-only periods, stepped rates, extra payments, and mortgage refinancing costs.
Personal loans
Compare personal loan rates and terms by monthly payment, total interest, and the effect of early payoff.
Auto and car loans
Calculate car payments and cumulative interest while including fees and prepayment penalties.
Student loans
Estimate monthly installments and the full amortization schedule when principal, rate, and repayment term are known.
Business and equipment loans
Compare equal-payment, equal-principal, variable-rate, and extra-principal repayment strategies.
Not suitable for revolving credit cards, minimum-payment plans, precomputed-interest loans, or balloon loans with principal due at maturity.
What can you compare?
Monthly payments across loan options
Enter principal, annual rate, and term to compare the payment burden of mortgage, personal, auto, and other loans.
Whether early payoff is worthwhile
See how much interest a recurring or one-time extra payment saves and how many months sooner the loan ends.
Whether refinancing really saves money
Compare the new rate and payment while including refinance fees and the old loan’s payoff penalty.
Frequently asked questions
You can estimate mortgages, personal loans, auto loans, student loans, and business loans when interest is based on the outstanding balance and principal is repaid monthly. It is not designed for revolving credit, precomputed-interest, or balloon loans.
Not necessarily. This calculator uses a monthly rate and rounds each payment. A lender may use daily interest and add insurance, servicing fees, or other contract charges. Confirm with an official lender quote and your agreement.
The principal does not decline during an interest-only period. The same balance then has to be repaid over fewer remaining months, generally increasing later payments and total interest.
It reduces future interest when interest is calculated from the outstanding principal. Results may differ for precomputed-interest loans or loans with substantial prepayment penalties.
No. All amounts, rates, and amortization calculations stay in your browser.