Loan Payment Calculator
Calculate monthly loan payments with interest for auto, mortgage, and personal loans — see total cost and interest breakdown.
Use this loan payment calculator to compute your fixed monthly payment, total repayment cost, and total interest for any installment loan. Covers auto loan, mortgage, and personal loan scenarios with government-sourced rate context.
Calculator Inputs
Principal amount borrowed
Nominal annual rate
Repayment duration
Live Results
Breakdown
Your Financial Snapshot
Loan Payment Calculator
Arogun Payment Snapshot
Your estimated tax liability
$525.05
Estimate monthly payments and the full borrowing cost before signing.
What This Loan Payment Calculator Computes
This calculator uses the standard amortization formula to find the fixed monthly payment required to fully repay an installment loan. It also shows total repayment and total interest — so you can see the real cost of borrowing, not just the monthly number.
It applies to any fixed-rate installment loan: auto loans, mortgage loans, personal loans, and student loans.
Loan Payment Formula (Monthly)
M = P × [r(1 + r)ⁿ] / [(1 + r)ⁿ − 1]
M = monthly payment
P = loan principal (amount borrowed)
r = monthly interest rate = annual rate ÷ 12
n = total number of monthly payments = years × 12
This is the standard present-value annuity formula used by lenders under the Truth in Lending Act (Regulation Z) to disclose APR and payment obligations.
Visual 1: Monthly Payment Comparison by Loan Type
Same principal, different rates and terms. Rate and term together determine both the monthly figure and the total interest you pay.
Loan Payment Calculator for Auto Loans
According to the Federal Reserve Consumer Credit G.19 release (March 2026), the average commercial bank interest rate on new car loans was 7.52% for 60-month terms and 7.55% for 72-month terms. Total motor vehicle loan balances outstanding were approximately $1.56 trillion.
The Consumer Financial Protection Bureau recommends knowing your interest rate and term before visiting a dealership, as dealer-arranged financing may carry different terms than direct bank or credit union financing.
Use this calculator with your expected rate and loan amount to compare 48-, 60-, and 72-month terms side by side before you commit.
Visual 2: Term Length Effect — Monthly Payment vs Total Interest (Auto Loan Example)
Extending from 48 to 72 months saves $217/month but adds $1,268 in total interest on a $25,000 auto loan at 7.52%.
Mortgage Loan Calculator Payment Context
For mortgage loans, the same amortization formula applies. Because mortgage terms are much longer (typically 15 or 30 years), even small rate differences produce large total interest differences. The CFPB's Explore Rates tool allows comparison of live mortgage rates by credit score and down payment to help consumers understand how rate shopping affects payment.
The CFPB notes that comparing at least three mortgage offers can reduce total borrowing cost meaningfully over the loan life. Use this calculator alongside a rate comparison before locking.
Visual 3: Interest Rate Impact on Total Interest Cost
Each 3-point increase in rate adds approximately $1,300–$1,500 in interest on a $25,000 five-year loan. Rate shopping is one of the highest-leverage decisions when borrowing.
How to Lower Your Monthly Loan Payment
- Increase the down payment to reduce the principal financed.
- Improve your credit profile before applying, since higher credit scores typically qualify for lower rates.
- Extend the loan term — but understand this increases total interest paid.
- Compare multiple lenders including banks, credit unions, and online lenders, which may offer different rates for the same loan amount.
- Negotiate the purchase price (auto or home) before the financing terms.
Frequently Asked Questions
How do I use a loan payment calculator with interest?
Enter the principal (amount borrowed), annual interest rate, and loan term in years. The calculator applies the amortization formula to return the fixed monthly payment, total repayment, and total interest cost.
How is a monthly loan payment calculated?
Monthly payment = P × [r(1+r)ⁿ] / [(1+r)ⁿ − 1], where P is principal, r is monthly interest rate (annual rate ÷ 12), and n is total months. This is the standard amortizing payment formula.
What is a typical auto loan payment calculator rate to use?
According to the Federal Reserve G.19 release (March 2026), commercial banks charged an average APR of 7.52% on 60-month new car loans and 7.55% on 72-month terms. Your actual rate will depend on your credit profile and lender.
How is a mortgage loan calculator payment different?
The formula is identical, but mortgage terms (15–30 years) and principal ($100k–$600k+) are much larger, so total interest compounds significantly. A 30-year mortgage can result in total interest exceeding the original principal.
Does total repayment include the principal?
Yes. Total repayment = monthly payment × number of months. Total interest = total repayment − original principal. Both figures are shown in this calculator's output.
Should I choose a shorter or longer loan term?
Shorter terms have higher monthly payments but lower total interest. Longer terms ease monthly cash flow but cost more over time. The right choice depends on your income stability and total budget, not just the monthly payment alone.
Does the rate include fees (APR vs interest rate)?
This calculator uses a nominal interest rate. APR includes fees and is therefore higher than the nominal interest rate on most loans. The CFPB's Regulation Z requires lenders to disclose APR for consumer credit so borrowers can compare offers on a true cost basis.
Can I use this for a personal loan payment calculator?
Yes. Enter the personal loan amount, the quoted annual rate (the Fed G.19 shows 24-month personal loan rates averaging 11.40% as of Q4 2025), and the term in years. The formula is the same regardless of loan type.
Sources
- Board of Governors of the Federal Reserve System. Consumer Credit — G.19 Statistical Release, March 2026 (released May 7, 2026). Includes commercial bank interest rates on new car loans and personal loans. FederalReserve.gov
- Consumer Financial Protection Bureau. Auto loans — Steps for getting an auto loan. ConsumerFinance.gov
- Consumer Financial Protection Bureau. Owning a Home — Explore loan choices and interest rate scenarios. ConsumerFinance.gov
- Consumer Financial Protection Bureau. Explore interest rates — mortgage rate comparison tool. ConsumerFinance.gov
- Consumer Financial Protection Bureau. 12 CFR § 1026 (Regulation Z) — Truth in Lending Act requirements, APR disclosure standards. ConsumerFinance.gov
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.
Last methodology review: May 17, 2026.
Written by
Founder of Arogun. Software engineer with hands‑on experience in taxes, budgeting, and financial planning. Passionate about transparent, accurate financial tools anyone can trust.
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