Loan Calculator Online Free
Calculate your monthly payments, total interest, and full amortization schedule. Free, no signup, everything runs in your browser.
⏱ 6 min read · Complete guide below
Loan Details
Enter your loan details and click Calculate to see your monthly payment, total interest, and amortization schedule.
This calculator provides estimates only and does not constitute financial advice. Actual loan terms and rates may vary. Consult a qualified financial professional for personalized guidance.
How to Calculate Your Loan
- 1Enter the loan amount — the principal you are borrowing (e.g. $250,000 for a mortgage, $25,000 for a car loan).
- 2Enter the annual interest rate as a percentage and the loan term in years or months.
- 3Click Calculate. Your monthly payment, total repayment amount, total interest paid, and a full month-by-month amortization schedule appear instantly.
Understanding Loan Amortization
A loan amortization schedule shows how each monthly payment is split between interest and principal over the life of the loan. In the early months, a larger portion goes toward interest and a smaller portion reduces the principal. Over time this ratio reverses: as the principal decreases, less interest accrues each month, so more of each payment reduces the outstanding balance.
Understanding this structure helps borrowers make smarter decisions. Making additional principal payments early in the loan term has a disproportionately large effect because it reduces the base on which all future interest is calculated — saving significantly more total interest than the same payment made late in the term.
What Determines the Rate You Are Offered
The interest rate is the single biggest lever on what a loan costs, and it is not arbitrary — lenders price it around risk. The most important factor is whether the loan is secured or unsecured. A secured loan is backed by collateral the lender can repossess (the house in a mortgage, the vehicle in a car loan), which lowers their risk and, in turn, the rate — this is why mortgages carry far lower rates than credit cards, which are unsecured. On top of that, lenders weigh your credit score and history, your debt-to-income ratio, the loan term (longer terms often carry slightly higher rates), and the size of your down payment. A useful consequence for borrowers: the numbers you enter here are only as good as the rate you actually qualify for, so improving your credit profile or offering a larger down payment before applying can change the monthly payment more than tinkering with the term. Always compare offers using APR, which folds fees into the rate, rather than the headline interest rate alone.
Worked Example: 15-Year vs 30-Year on the Same $300,000 Loan
Borrow $300,000 at a fixed 6.5% annual rate and the term you choose changes the outcome dramatically. Over 30 years, the payment works out to about $1,896/month, and by the final payment you will have paid roughly $382,600 in interest alone — more than the original loan amount. Over 15 years, the payment rises to about $2,614/month — $718 more each month — but total interest drops to roughly $170,400.
Paying $718 extra per month buys you about $212,200 in interest savings. Whether that trade is worth it depends on what else that $718/month could earn you elsewhere — if you can reliably invest it at a return higher than your loan's 6.5% rate, the 30-year term plus investing the difference can outperform the 15-year payoff mathematically, even though it feels less intuitive than "debt-free faster." Run both scenarios above with your own numbers to see the exact crossover point.
Common Loan Types Reference
| Loan Type | Typical Amount | Typical Term | Approx. Rate Range |
|---|---|---|---|
| Home mortgage | $150,000–$600,000 | 15–30 years | 4–7% |
| Car loan | $10,000–$50,000 | 3–7 years | 5–12% |
| Personal loan | $1,000–$50,000 | 1–7 years | 8–20% |
| Student loan | $5,000–$100,000 | 5–20 years | 3–7% |
| Business loan | $10,000–$500,000 | 1–10 years | 6–15% |
| Credit card (revolving) | Varies | No fixed term | 18–29% |
Tips for Smarter Borrowing
Shorter Term = Less Interest
A 15-year mortgage at the same rate as a 30-year loan will have higher monthly payments but you'll pay roughly half the total interest over the loan's life. Run both scenarios in the calculator to see the exact difference.
Extra Payments Save Thousands
Even one extra principal payment per year significantly reduces total interest and loan duration. The earlier in the term you make extra payments, the greater the impact.
Compare Total Cost, Not Monthly Payment
A lower monthly payment from a longer loan term typically means more total interest paid. Always compare the total repayment amount — not just the monthly figure.
APR vs Interest Rate
Annual Percentage Rate (APR) includes fees and other costs in addition to the base interest rate. For true cost comparison between lenders, use APR — not just the advertised interest rate.
Fixed vs Variable Rates
Fixed-rate loans lock in your rate for the entire term. Variable-rate loans may start lower but can increase. This calculator uses fixed rates — factor in rate risk when comparing loan options.
Model Refinancing Scenarios
If interest rates drop after you take out a loan, refinancing can reduce your rate and monthly payment. Use this calculator to model both the original loan and a refinanced version to see if the savings justify any refinancing fees.
Frequently Asked Questions
What is the monthly payment formula?
The monthly payment for an amortising loan is: M = P × [r(1+r)n] / [(1+r)n - 1], where P is the principal, r is the monthly interest rate (annual rate ÷ 12), and n is the total number of payments. This formula assumes equal payments throughout the term with no extra fees.
What is an amortization schedule?
An amortization schedule is a table showing each periodic payment, how much goes toward interest, how much reduces the principal, and the remaining balance after each payment. This calculator generates a full month-by-month amortization table.
What is the difference between interest rate and APR?
The interest rate is the base annual cost of borrowing. APR (Annual Percentage Rate) includes the interest rate plus additional fees — origination fees, mortgage insurance, points. For a true cost comparison between lenders, always compare APR rather than interest rate alone.
How does making extra payments affect my loan?
Additional principal payments reduce the outstanding balance, which reduces the interest charged in all subsequent periods. Even one extra monthly payment per year on a 30-year mortgage can cut 4–5 years off the loan term and save tens of thousands in total interest.
Can I calculate a mortgage with property taxes and insurance?
This calculator computes pure principal and interest (P&I) payments. Property taxes, homeowner's insurance, and PMI (private mortgage insurance) are not included. Your actual monthly payment to a lender (PITI — Principal, Interest, Taxes, Insurance) will be higher.
What is the difference between a 15-year and 30-year mortgage?
A 30-year mortgage has lower monthly payments but roughly double the total interest cost of a 15-year loan at the same rate. A 15-year mortgage builds equity faster and costs less overall, but requires higher monthly payments. Use the calculator with both terms to compare the exact numbers for your situation.
Does this calculator work for car loans, personal loans, and mortgages?
Yes. The same amortization formula applies to any fixed-rate instalment loan. Enter the principal, rate, and term and the calculator gives the correct result regardless of loan type.
How accurate is the calculator?
The calculator uses standard loan amortization mathematics and assumes fixed monthly payments, no fees, and no rate changes. Results match those from bank calculators for the same inputs. It does not account for prepayment penalties, balloon payments, or variable interest rates.