Loan Calculator
Calculate your monthly loan payments, total interest, and total cost with our free Loan Calculator. See a complete amortization schedule showing exactly how each payment is applied to principal and interest over the life of your loan. Perfect for mortgages, auto loans, personal loans, and more.
How Loan Calculations Work
Loans use simple interest amortization. Each monthly payment is divided between interest charges and principal reduction. Early in the loan, a larger portion goes toward interest; later, more goes toward principal. This is because interest is calculated on the outstanding balance, which decreases over time.
The formula used to calculate your monthly payment is:
M = P × [ r(1 + r)n ] / [ (1 + r)n - 1 ]
Where:
M = Monthly payment
P = Principal (loan amount)
r = Monthly interest rate (Annual rate ÷ 12)
n = Total number of payments (loan term in months)
For example: A $25,000 loan at 6.5% APR for 60 months:
- Monthly rate = 0.065 ÷ 12 = 0.0054167
- Monthly Payment = $25,000 × [0.0054167(1.0054167)^60] / [(1.0054167)^60 − 1] = $489.15
- Total Interest = ($489.15 × 60) − $25,000 = $4,349
- Total Cost = $29,349
Smart Loan Strategies
- Make a Larger Down Payment: A 20% down payment reduces your loan amount and saves thousands in interest.
- Choose Shorter Loan Terms: While monthly payments are higher, shorter terms save significant interest. Example on $25,000 at 6.5%: 48 months ($593/month, $3,464 interest) vs 72 months ($421/month, $5,311 interest) — save $1,847 in interest!
- Pay Extra Each Month: Adding just $50 extra per month can shorten your loan by months and save hundreds in interest.
- Improve Your Credit Score: Before applying, check your credit. A 700+ score qualifies for the best rates.
❓ Loan Calculator FAQ
What is the formula for calculating loan payments?
The formula is M = P × [r(1+r)^n] / [(1+r)^n - 1], where M is the monthly payment, P is the principal, r is the monthly interest rate, and n is the number of payments. This calculator does the math for you.
What is the difference between principal and interest?
Principal is the amount you borrowed. Interest is the cost of borrowing that money, calculated as a percentage of the remaining balance. Each payment covers both principal and interest.
What is an amortization schedule?
An amortization schedule shows each payment's breakdown between principal and interest, along with the remaining balance. It helps you understand how your loan is paid off over time.
How does the calculator handle extra payments?
When you enter an extra monthly payment, the calculator applies it directly to the principal balance. This reduces your total interest paid and can shorten your loan term significantly.
What is a good interest rate for a personal loan?
Good rates vary by credit score. With excellent credit (750+), rates are typically 6-10%. With good credit (700+), expect 8-14%. With fair credit (650+), rates may be 14-20%.
What is the difference between APR and interest rate?
APR (Annual Percentage Rate) includes interest plus fees. The interest rate is the base cost of borrowing. Always compare APR when shopping for loans.
Can I pay off my loan early?
Most loans have no prepayment penalties. Paying extra each month, even $25-50, reduces principal faster and saves significant interest. Check your loan terms for any prepayment penalties.
How does the loan term affect my monthly payment?
A longer loan term lowers your monthly payment but increases the total interest you pay. A shorter term means higher monthly payments but less interest overall. Compare different terms with this calculator.
What is the difference between simple interest and compound interest?
Most loans use simple interest, calculated only on the principal balance. Compound interest is calculated on principal plus accumulated interest. Simple interest is more favorable for borrowers.
How does a down payment affect my loan?
A larger down payment reduces the amount you need to finance, which lowers your monthly payment and total interest paid. It also reduces your loan-to-value ratio.
What is the total cost of a loan?
The total cost includes the loan amount plus all interest paid over the life of the loan. This calculator shows the total cost so you can see the true price of financing.
What credit score do I need for a loan?
Requirements vary by loan type. Personal loans typically require 600+ (fair credit), while mortgages and auto loans may accept 580+ with higher rates. The best rates go to 750+ scores.
How do I calculate my monthly payment?
Use the formula: M = P × [r(1+r)^n] / [(1+r)^n - 1]. This calculator does the math for you — just enter your loan details and click "Calculate Loan."
What is the difference between a secured and unsecured loan?
A secured loan requires collateral (like a house or car). An unsecured loan has no collateral but typically has higher interest rates. This calculator works for both.
How does making extra payments affect my loan?
Extra payments reduce your principal balance faster, which lowers the total interest you pay and can shorten your loan term. Even small extra payments ($25-50/month) can save hundreds in interest.
What is the difference between a fixed-rate and variable-rate loan?
A fixed-rate loan has the same interest rate for the entire term. A variable-rate loan can change over time based on market conditions. Fixed rates offer predictability.
How accurate is this loan calculator?
This calculator provides accurate results based on the standard loan formula. However, actual loan terms may vary by lender. Use this as a planning tool to understand your options before applying for a loan.