Loan Calculator
Use this loan calculator to estimate how a fixed-rate installment loan could cost each month, how much you may pay over the full term, and how much of that total may go toward interest.
It is built as a broad borrowing-planning tool for comparing how loan amount, interest rate, and loan term change monthly payment, total paid, and total interest across many fixed-term borrowing scenarios.
If you are specifically planning around unsecured borrowing for debt consolidation, emergency expenses, or home repairs, compare it with the Personal Loan Calculator.
If you are financing a car and need to model trade-in value, sales tax, and dealer fees, use the Auto Loan Calculator.
If you are planning a home purchase with taxes, insurance, HOA, or PMI, use the Mortgage Calculator instead.
Results are planning estimates only. Fees, APR differences, and lender-specific terms may not be included, and actual loan offers can vary.
How to use this calculator
- Enter the amount you plan to borrow.
- Add the interest rate you want to model.
- Set the number of years you expect to repay the loan.
- Review the estimated monthly payment, total paid over the term, and total interest paid.
This works well for early borrowing research, comparing how loan size, rate, and term affect cost, or seeing how a longer term may lower your monthly payment while increasing total interest.
How it works
This calculator estimates your monthly payment using the loan amount, interest rate, and repayment term.
It is designed as a general fixed-rate installment loan estimator for comparing how amount, rate, and term affect cost over time.
Calculation formula
M = P × r × (1 + r)n / ((1 + r)n − 1)
Variable definitions
- M
- Monthly payment
- P
- Loan amount (principal)
- r
- Monthly rate derived from annual rate
- n
- Total number of monthly payments
Notes and assumptions
- Interest is modeled as a fixed rate over the full term.
- Years are converted into total monthly payments.
- Total paid over the loan term is the sum of all scheduled monthly payments, and total interest is the amount paid above the original loan amount.
Assumptions and limitations
- Results are estimates based on a fixed interest rate over the full repayment term.
- Monthly payments are modeled as equal payments made over the full term.
- Fees, APR differences, prepayment behavior, and lender-specific charges are not included.
- This calculator is for planning only and is not a formal loan quote or approval.
Example scenario
Use this example to see how a neutral fixed-rate installment loan estimate can help you compare the effect of amount, rate, and term.
- Loan amount:
$20,000 - Interest rate:
8.5% - Loan term:
5 years
With those inputs, the estimated monthly payment is $410.33.
The estimated total paid over the loan term is $24,619.84.
That means total interest paid is about $4,619.84.
This example shows why a general loan calculator is useful for comparison: monthly affordability and long-term borrowing cost can change meaningfully with different rate and term assumptions.
Frequently asked questions
What is a loan calculator used for?
A loan calculator helps you estimate monthly payment, total paid, and total interest for a fixed-rate loan before you apply with a lender.
How does loan term affect monthly payment and total interest?
A longer term usually lowers the monthly payment because you spread repayment over more months, but it often increases total interest. A shorter term usually raises the monthly payment while reducing total interest.
Does this calculator show monthly payments?
Yes. The main result is an estimated monthly payment based on the loan amount, interest rate, and repayment term you enter.
Does it include fees or APR?
No. This version focuses on the base fixed-payment loan estimate. Origination fees, APR differences, and lender-specific charges are not included.
How do fixed-rate installment loans work?
A fixed-rate installment loan is typically repaid with equal monthly payments over a set term. Each payment usually covers both principal and interest, and the payment amount stays the same if the rate does not change.
What is the difference between APR and interest rate?
Interest rate is the base borrowing rate used to calculate the payment. APR can include interest plus certain fees, so it may be higher than the interest rate. This calculator uses the interest rate you enter and does not calculate APR.
What affects my monthly loan payment?
The biggest drivers are the amount borrowed, the interest rate, and the repayment term. Larger loans and higher rates usually raise the payment, while longer terms can lower the monthly payment but increase total interest.
How can I lower my monthly payment?
Common ways include borrowing less, qualifying for a lower rate, or choosing a longer repayment term. A longer term can reduce the monthly payment but often increases the total interest paid.
Why is the total paid higher than the amount borrowed?
Because interest adds borrowing cost over time. The longer the term and the higher the interest rate, the larger the total paid can become.
Is this a lender quote?
No. This is a planning estimate, not a lender quote or loan approval. Actual offers vary by credit profile, fees, lender terms, and underwriting.
Can I use this for personal or auto loans?
Yes. It works well for general fixed-rate installment loan planning, including many personal loans and auto loans. If you want a vehicle-specific estimate that includes down payment, trade-in value, taxes, and fees, use the Auto Loan Calculator.
Related Calculators
Amortization Calculator
View a full amortization schedule for a fixed-rate loan, including principal, interest, remaining balance, payoff timing, and the impact of extra monthly payments.
Personal Loan Calculator
Estimate your monthly personal loan payment, total paid over the term, and total interest paid for a fixed-rate unsecured loan.