Estimate repayment schedules for debts and installment loans.
Overview
Repayment planning turns a loan from a vague obligation into a clear schedule of principal, interest, and payoff timing. Even small extra payments can reduce long-term cost meaningfully.
This calculator estimates monthly payments, total interest, and payoff date based on your loan terms. It can also model accelerated repayment scenarios.
Because contract terms vary, confirm outputs against official lender amortization schedules before final decisions.
Steps
Use outstanding principal amount.
Set annual rate and remaining repayment months.
Generate standard amortized monthly amount.
Input recurring additional principal payment.
Review interest saved and months reduced.
Select strategy you can sustain consistently.
Math
PMT = P[r(1+r)^n]/[(1+r)^n - 1]
The amortization formula computes fixed periodic payments that cover interest and principal over the selected term. Extra principal payments shorten payoff duration and reduce interest.
Worked cases
Apply amortization formula
Returns monthly payment and total scheduled interest.
Recompute amortization with higher total monthly payment
Loan pays off earlier with lower total interest cost.
Compare payment and interest under new rate assumptions
Quantifies potential savings before refinancing fees.
Why use this
Questions