Loan Calculator
Estimate your monthly payments, total interest, and total cost for any loan.
How to Use
- Enter the total loan amount you plan to borrow in dollars.
- Enter the annual interest rate as a percentage (e.g., 6.5 for 6.5%).
- Enter the loan term in years (e.g., 30 for a 30-year mortgage).
- Click "Calculate" to see your estimated monthly payment, total interest, and total payment.
Frequently Asked Questions
What formula does this calculator use?
This calculator uses the standard amortization formula: 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 total number of payments.
Does this include taxes and insurance?
No. This calculator computes principal and interest only. Your actual monthly payment may be higher when property taxes, homeowner's insurance, and PMI are included.
Can I use this for different types of loans?
Yes. This calculator works for mortgages, auto loans, personal loans, student loans, and any other fixed-rate amortizing loan.
What if my interest rate is 0%?
If the interest rate is 0%, the calculator will simply divide the loan amount by the total number of months to determine the monthly payment, with zero total interest.
How Interest Rate Affects Your Loan — Real Numbers
Even a 1% difference in interest rate has a dramatic effect on total cost. This table shows the real impact on a $200,000 loan over 30 years:
| Interest Rate | Monthly Payment | Total Interest Paid | Total Cost |
|---|---|---|---|
| 4% | $955 | $143,739 | $343,739 |
| 5% | $1,074 | $186,511 | $386,511 |
| 6% | $1,199 | $231,676 | $431,676 |
| 7% | $1,331 | $279,018 | $479,018 |
| 8% | $1,468 | $328,310 | $528,310 |
Shorter vs Longer Loan Terms
| Loan Term | Monthly Payment | Total Interest | Best For |
|---|---|---|---|
| 10 years | Higher | Lowest | Pay off debt fast, minimise interest |
| 15 years | Moderate | Low | Balance between payment and interest savings |
| 20 years | Lower | Moderate | Lower monthly commitment with some savings |
| 30 years | Lowest | Highest | Maximum monthly affordability, most flexibility |
Tips for Managing Your Loan Effectively
- 1Shop for the lowest interest rate before committing. Even 0.5% difference in rate can save thousands over the life of a loan. Get quotes from at least 3 lenders and compare the APR, not just the interest rate.
- 2Make extra payments when possible. Any amount paid above your minimum monthly payment goes directly to reducing your principal — dramatically cutting total interest.
- 3Understand APR vs interest rate. The Annual Percentage Rate (APR) includes fees and other costs, making it the true cost of borrowing. Always compare APR when evaluating loan offers.
- 4Improve your credit score before applying. Borrowers with higher credit scores qualify for significantly lower interest rates. Even a 50-point improvement can save thousands over the life of a large loan.
- 5Use this calculator to stress-test your budget. Calculate what your monthly payment would be if rates rise by 1–2%. If the higher payment would strain your budget, consider a smaller loan or longer term as a buffer.
Learn More
How to Calculate Student Loan Payments
Understand interest rates, repayment plans, and strategies to pay off student loans faster.
How to Calculate Your Retirement Savings Goal
Use compound interest and savings calculators to plan your financial future.
Frequently Asked Questions
What formula does this loan calculator use?
Does this include taxes and insurance?
Can I use this for different types of loans?
What is amortisation?
Should I choose a 15-year or 30-year mortgage?
Is my financial data private?
What if my interest rate is 0%?
Financial Disclaimer: The loan calculator on ToolsNest is provided for informational purposes only. Results are estimates based on the standard amortisation formula. They do not constitute financial advice. Always consult a qualified financial advisor or lender before making borrowing decisions.