Loan Payment Calculator
Calculate monthly payment, total repayment, and total interest for personal or business installment loans.
Model fixed-rate installment loan costs before borrowing. Compare payment burden and long-term interest impact with transparent formulas.
Calculator Inputs
Principal amount borrowed
Nominal annual rate
Repayment duration
Live Results
Breakdown
Why Loan Math Matters Before You Borrow
The advertised loan amount is only part of the story. Fixed monthly payments can look manageable, but total interest cost over the full term can be substantial. This calculator exposes both monthly affordability and long-run cost.
Scenario Snapshot
The same monthly payment always contains both principal and interest. Over long terms, interest can become a large share of total cost.
Trend View (Term Comparison)
Shorter terms raise monthly payments but reduce interest. Longer terms lower monthly burden but increase total borrowing cost.
Frequently Asked Questions
Why is total repayment much higher than the amount borrowed?
Installment loans include interest in every payment. Over longer terms, cumulative interest can be substantial.
Does this include origination fees?
No. This calculator models principal and interest only. Include fees separately when comparing offers.
Can extra payments reduce total interest?
Yes. Additional principal payments generally reduce both payoff time and total interest cost.
Sources
- Federal Reserve. Consumer Credit (G.19) and borrowing trends. FederalReserve.gov
- Consumer Financial Protection Bureau. Loans and debt management explainers. CFPB.gov
- Investopedia. Amortization and installment loan mechanics. Investopedia.com
Methodology and Limits
This tool uses transparent formulas and user-provided inputs to generate planning estimates in your browser. Results are for educational use and should be validated before making legal, financial, tax, or medical decisions.
Key Assumptions
- Uses a standard fixed-rate amortization equation with equal monthly payments.
- Origination fees, insurance products, and prepayment penalties are excluded.
- Displayed totals are planning estimates and may differ from lender disclosures.
Primary References
Last methodology review: May 17, 2026.
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