LLoanLab

LoanLab

Clear payments, interest, and payoff plans

Free calculators for mortgages, auto loans, personal loans, student loans, and home equity — with amortization, early repayment, and rate comparison built in.

Browse calculatorsStart with mortgage

Choose a calculator

Each tool shares the same engine: monthly payment, total interest, full amortization, extra payments, and APR scenarios.

Built for clarity

  • Payment & interest

    See the scheduled monthly payment and lifetime interest before you commit.

  • Amortization

    Follow principal vs. interest month by month until the balance hits zero.

  • Extra pay & rates

    Model early repayment savings and compare multiple APR scenarios side by side.

Frequently asked questions

How is a monthly loan payment calculated?+

For a fully amortizing loan, the payment uses the standard formula M = P × r(1+r)^n / ((1+r)^n − 1), where P is the principal, r is the monthly interest rate, and n is the number of months. If the rate is zero, the payment is simply principal divided by months.

What does an amortization schedule show?+

Each row shows how one payment splits into interest and principal, any extra payment applied that month, and the remaining balance. Early rows are usually interest-heavy; later rows pay down more principal.

How does early repayment save money?+

Extra principal reduces the balance sooner, so less interest accrues in future months. LoanLab shows months saved and interest saved compared with making only the scheduled payment.

Can I compare different interest rates?+

Yes. Enter two or three APR scenarios to see side-by-side monthly payments, total interest, and total amount paid for the same loan amount and term.

Updated 2026-11-11. Canonical home: https://loanlab.app/