How to Use This Calculator
- 1
Enter Loan Amount
Input the total principal sum of money you wish to borrow.
- 2
Specify Annual Interest Rate
Enter the yearly interest rate (APR) charged by the lender, expressed as a percentage.
- 3
Define Loan Term
Input the total repayment period for the loan, measured in months.
- 4
Review Your Loan Summary
The calculator displays your Monthly Payment, Total Interest, Total Cost of Loan, and Payoff Date. The Insights panel shows first/last month interest breakdown and daily accrual. Scroll down for the balance chart and full amortization schedule.
Example Calculation
A prospective car buyer needs to calculate the monthly payments and total cost for a $25,000 auto loan at 7% interest over 5 years.
Loan Amount ($)
25,000
Annual Interest Rate (%)
7
Loan Term (months)
60
Results
Monthly Payment
$495.03
Total Interest
$4,701.80
Total Cost of Loan
$29,701.80
Tips
Shorter Terms Save More
A 48-month term instead of 60 months on a $25,000 loan at 7% raises the payment by about $104/month but saves $966 in total interest.
Check the Amortization Schedule
Scroll down to see the full month-by-month breakdown. In the early months, 29% of each $495.03 payment goes to interest — by the last month, almost all goes to principal.
Factor in All Loan Costs
The APR can include fees beyond the interest rate. Review your loan disclosure documents for origination fees, and use the Total Cost figure to compare offers.
Your Essential Loan Payment Calculator
Taking on a loan is a significant financial commitment, and understanding its true cost is paramount.
The Loan Payment Calculator computes your monthly payment, total interest, total cost, and provides a full amortization schedule for any fixed-rate loan.
For example, a $25,000 loan at 7% annual interest over 60 months results in a monthly payment of $495.03 and total interest of $4,701.80.
The Amortization Formula for Calculating Loan Payments
The calculator uses the industry-standard amortization formula to determine the fixed monthly payment:
M = P x [i(1 + i)^n] / [(1 + i)^n - 1]
Where:
P= principal loan amounti= monthly interest rate (Annual Rate / 12 / 100)n= total number of payments (months)
Estimating a Car Loan Payment: A Worked Example
Consider financing a $25,000 car with a 7% annual interest rate over 60 months.
- Monthly interest rate (i): 7% / 12 / 100 = 0.0058333
- Calculate (1 + i)^n: (1.0058333)^60 = 1.4176
- Calculate numerator: 25,000 x 0.0058333 x 1.4176 = 206.73
- Calculate denominator: 1.4176 - 1 = 0.4176
- Monthly payment: 206.73 / 0.4176 = $495.03
- Total paid: $495.03 x 60 = $29,701.80
- Total interest: $29,701.80 - $25,000 = $4,701.80
Your first payment splits $145.83 to interest and $349.20 to principal.
By month 60, nearly all of the payment goes to principal.
Key Factors Influencing Your Loan Payments
Your loan payment is determined by three variables: loan amount, interest rate, and term.
Even a small rate change matters — reducing from 7% to 6.5% on a $25,000 loan over 5 years saves about $353 in total interest.
Extending a mortgage term from 15 to 30 years for $200,000 at 7% drops the monthly payment by about $467, but roughly doubles the total interest paid.
Typical Loan Payment Ranges by Loan Type
Monthly loan payments vary significantly by loan type and current market rates.
For a $300,000 30-year fixed mortgage at 7%, monthly payments are approximately $1,996 (excluding taxes and insurance).
A $30,000 5-year auto loan at 6% has monthly payments of about $580.
Personal loans of $10,000 over 3 years at 8% cost approximately $313 per month.
Frequently Asked Questions
What factors determine my monthly loan payment?
Your monthly loan payment depends on three factors: the loan amount (principal), the annual interest rate, and the loan term in months. A higher principal or interest rate increases the payment, while a longer term decreases it but increases total interest paid.
Can I use this calculator for any type of loan?
Yes, this calculator works for any fixed-rate, fully amortizing loan including personal loans, auto loans, and fixed-rate mortgages. It does not account for variable rates, balloon payments, or interest-only periods.
Why does a longer loan term result in more total interest?
A longer term means you are paying interest on the outstanding balance for more months. Even though each monthly payment is smaller, the cumulative interest charges over the extended period exceed what you would pay with a shorter term.
What happens if I miss a loan payment?
Missing a payment typically results in late fees, potential damage to your credit score, and additional interest accrual. If payments are missed repeatedly, the loan may go into default. Contact your lender immediately if you anticipate difficulty making a payment.