This calculator assumes a fixed-rate installment loan
The Loan Calculator estimates payment, total interest, total paid, and payoff time from loan amount, annual interest rate, term, first payment date, and optional extra monthly payment. It is built around fixed scheduled payments rather than revolving credit.
The result is useful for personal loans, simple installment comparisons, and understanding how rate and term change payment size.
The payment is based on the periodic rate
The local solver converts the annual rate into a monthly periodic rate, then calculates the payment needed to amortize the balance across the selected term. If the rate is zero, the payment is essentially principal divided across the payments.
Small rate changes can matter when the term is long or the loan amount is large.
Term can be entered as months or years
The term unit controls whether the entered term is multiplied into months or used directly. A five-year loan and a five-month loan are completely different schedules.
Confirm the term unit before comparing offers, especially when one lender quotes months and another describes years.
Extra payments are treated as additional principal
The optional extra payment is added to the regular monthly payment in the amortization schedule. When applied to principal, extra payments can reduce payoff time and total interest.
Actual lenders may have rules for prepayment, payment timing, and how extra amounts are credited. Read the loan agreement before assuming the calculator pattern will match servicing.
Fees are not part of this simple loan amount
Application fees, origination charges, credit insurance, late fees, and other costs may not be included unless they are already folded into the loan amount. APR can also differ from the note interest rate when fees are included.
A serious comparison should look at total cost, not just the monthly payment.
The schedule explains why interest falls over time
In a standard amortizing loan, each payment covers that period's interest first and then reduces principal. As the principal balance falls, the interest portion usually falls too.
The Amortization Calculator uses similar loan fields when the schedule itself is the main focus.
Loan purpose can require a specialized page
A car purchase may include trade-in value, sales tax, dealer fees, and a different shopping process. The Auto Loan Calculator includes those vehicle-specific fields.
A home purchase has property taxes, insurance, and mortgage-specific costs, so the Mortgage Calculator is more complete for housing.
Payment comfort is not the same as affordability
A low monthly payment can come from a long term, high total interest, or both. A payment that fits this month can still be expensive over the full life of the loan.
Compare payment, total paid, interest, fees, payoff time, and budget risk together.
Use lender documents for final decisions
The calculator cannot know underwriting terms, exact APR disclosures, prepayment penalties, credit requirements, variable-rate clauses, or payment due-date rules. It is a planning tool.
Before signing, read the loan agreement and ask the lender to explain any number that differs from the calculator.
Save the assumptions with the result
A useful loan note includes amount borrowed, rate, term, first payment month, extra payment, monthly payment, total interest, total paid, and payoff time. Those assumptions make later comparisons much clearer.
Refinancing changes the comparison
If replacing an existing loan, compare remaining balance, new fees, new rate, new term, and total cost from today forward. A lower payment can still cost more if the term is reset too far.