Loan Calculator
Model the real monthly payment and total interest before you accept a lender offer or refinance plan.
Need a walkthrough? Read the Loan Calculator Guide.
How Loan Calculation Works
The Loan Calculator computes monthly payments, total interest, and amortization schedules for any fixed-rate loan. Enter the loan amount, interest rate, and term to see exactly how much you will pay each month and how your payments split between principal and interest over time.
Formula
Monthly Payment = P x [r(1+r)^n] / [(1+r)^n - 1] where P=principal, r=monthly rate, n=total payments
Key Features
- ✓Monthly payment calculation for any loan amount
- ✓Complete amortization schedule with principal/interest split
- ✓Total interest paid over the life of the loan
- ✓Compare different loan terms and rates
Pro Tip
Even small interest rate differences matter significantly over long terms. A 0.5% lower rate on a 200,000 USD 30-year mortgage saves over 20,000 USD in total interest. Always shop multiple lenders.
Borrowing check
Compare the total loan cost before focusing on the monthly payment
A loan can look affordable month to month while still being expensive over the full term. Use the calculator to compare payment, interest, and term length before accepting an offer or refinancing.
Methodology
- Use the loan amount, annual percentage rate, and term length to estimate the amortized monthly payment.
- Compare total interest across terms so a lower payment does not hide a much higher lifetime cost.
- Pressure-test the payment against income, emergency savings, and other fixed obligations before applying.
Practical examples
- A $25,000 loan at 8 percent for 5 years has a payment near $507 and total interest around $5,415.
- A longer term can reduce the monthly payment but usually increases total interest.
- A small rate improvement matters more on large balances or long repayment terms.
Common mistakes to avoid
- Do not compare loans using monthly payment only.
- Do not ignore origination fees, early repayment rules, late fees, or variable-rate risk.
- Do not assume approval terms will match an advertised rate without checking eligibility and credit impact.
When to use this calculator
- Before taking a new car, personal, or consolidation loan.
- When comparing two loan terms with different monthly payments.
- When you want to see whether a slightly lower rate is worth shopping for.
Worked example
A $25,000 loan at 8% over 5 years produces a payment of about $506.91 per month. Over the full term, you repay roughly $30,414.59, which means about $5,414.59 of the total cost is interest. That gives you a clean baseline to compare against shorter terms or lower-rate offers.
How to interpret your results
Do not stop at the monthly payment. If the payment fits your budget but the total interest feels too expensive, rerun the numbers with a shorter term or a lower rate target. If the shorter term is too tight, use the payment result as your ceiling and work backward from there.
For a clearer explanation of why early payments are interest-heavy, read How to Calculate Loan Payments.
What to do next
Pressure-test the payment against take-home pay, then compare the rate structure before you apply.
Related tools: Loan Payoff Calculator and Salary Calculator.
Compare loan types: Fixed Rate vs Variable Loan.
If this borrowing decision affects a home purchase, run the housing scenario in Mortgage Calculator.
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