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Amortization Schedule
Each row shows how your monthly payment is split between principal and interest, and your remaining balance.
| # | Month | Payment | Principal | Interest | Balance |
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How to Use the Loan Calculator
Our free loan calculator helps you quickly understand the true cost of borrowing money. Whether you're planning to take out a mortgage, finance a new car, or cover personal expenses, knowing your monthly payment and total interest upfront can save you thousands of dollars.
Step 1: Enter Your Loan Amount
Type the amount you wish to borrow or use the slider to adjust. For home mortgages, this is typically the home price minus your down payment. For car loans, it's the vehicle price minus any trade-in value or down payment.
Step 2: Set the Interest Rate
Enter your annual interest rate (APR). This is provided by your lender and varies based on your credit score, loan type, and market conditions.
Step 3: Choose the Loan Term
Select how many years you'll take to repay the loan. A longer term means lower monthly payments but significantly more interest paid over the life of the loan. A shorter term means higher payments but less total interest.
Understanding the Amortization Schedule
An amortization schedule shows every single payment you'll make over the life of the loan. In the early months, most of your payment goes toward interest. As time goes on, more and more of each payment goes toward reducing the principal balance. This is called front-loaded interest and is standard for all fixed-rate loans.
How Monthly Payments Are Calculated
The standard formula for a fixed-rate loan monthly payment is:
- M = Monthly payment
- P = Principal loan amount
- r = Monthly interest rate (annual rate ÷ 12)
- n = Total number of payments (years × 12)
Why Interest Rates Matter
Interest rates have a massive impact on the total cost of your loan. For example, on a $300,000 mortgage:
- At 4.5% interest: Total interest paid = ~$237,000
- At 6.5% interest: Total interest paid = ~$357,000
- At 8.5% interest: Total interest paid = ~$510,000
That's a difference of $273,000 between the lowest and highest rate — for the same $300K borrowed over 30 years. Even a 0.5% difference can mean $30,000+ in savings.
Understanding Different Loan Types
Mortgages: Long-term loans (typically 15–30 years) for purchasing property. Usually have the lowest interest rates because the property serves as collateral. Mortgages are secured loans.
Car Loans: Short- to medium-term loans (typically 3–7 years) for vehicle purchases. Interest rates range from 4–8% for buyers with good credit. The vehicle serves as collateral.
Personal Loans: Unsecured loans with shorter terms (2–7 years) and higher interest rates (8–25%+). These loans typically have higher rates because there's no collateral backing them.
Student Loans: Federal or private loans for education expenses. Federal student loans often have lower rates and more flexible repayment options than private alternatives.
How Interest Is Calculated: Simple vs. Compound
Most loans use simple interest, meaning interest is calculated only on the remaining principal balance. Each month, your balance decreases, so you pay less interest on future payments. This is why extra principal payments early in the loan save so much money.
Some short-term loans use compound interest, where interest can accrue on top of unpaid interest, making them far more expensive. Always ask your lender to clarify how interest is calculated.
Fixed-Rate vs. Variable-Rate Loans
Fixed-Rate Loans: Your interest rate never changes. This calculator assumes fixed-rate loans. The advantage is predictability — you always know exactly what your payment will be. Most mortgages are fixed-rate.
Variable-Rate (ARM) Loans: Interest rates start low but can adjust periodically, usually resulting in higher payments later. These are riskier but can save money in the short term if rates don't rise significantly.
Frequently Asked Questions
A "good" interest rate depends on the loan type and your credit score. For mortgages in 2024, rates below 6.5% were considered competitive. For personal loans, anything below 10% is generally favorable. Car loans from dealerships often range from 4–8% for buyers with good credit. Always compare offers from multiple lenders.
A 15-year mortgage has a higher monthly payment but you'll pay far less interest overall — often less than half the total interest of a 30-year loan. A 30-year mortgage has lower monthly payments, freeing up cash for investments or emergencies. Use our calculator to compare both options side-by-side.
Extra payments go directly toward reducing your principal balance, which reduces the amount of interest you'll pay going forward. Even one extra payment per year can shorten a 30-year mortgage by 4–6 years and save $30,000–$60,000+ in interest depending on your loan size and rate.
The interest rate is the base cost of borrowing money. APR (Annual Percentage Rate) includes the interest rate plus any fees, points, or other costs, making it a more complete picture of the true cost of a loan. When comparing lenders, always compare APRs, not just interest rates.
Your credit score is one of the biggest factors lenders use to determine your interest rate. A score above 760 typically qualifies for the best rates. A score between 620–679 may still qualify for a loan but at a significantly higher rate — sometimes 1–3% more. On a $300,000 mortgage, a 1% higher rate can cost over $60,000 in extra interest over 30 years.
Yes — our calculator uses the standard amortization formula used by banks and lenders worldwide. Results are accurate for fixed-rate loans. Note that our calculator does not include property taxes, homeowner's insurance, or PMI for mortgages, which would increase your actual monthly cost. Always confirm figures with your lender.
Amortization is the process of paying off a loan over time through regular payments. An amortization schedule shows how each payment is split between principal (money reducing your debt) and interest (money paid to the lender). Early in the loan term, most of your payment goes toward interest. As time goes on, more goes toward principal. This is why paying extra early in the loan saves significant interest — you're paying down the principal faster, reducing the amount of interest that will accrue in future months.
The more you put down, the less you need to borrow, and the less interest you'll pay overall. For mortgages, 20% is considered the sweet spot — it avoids expensive Private Mortgage Insurance (PMI). For car loans, 10–20% is standard. Even putting down an extra $1,000 on a car can save thousands in interest. Use our calculator to experiment with different loan amounts to see the impact of various down payments.
Pre-qualification is an informal estimate from a lender based on information you provide. It's quick and usually free but not binding. Pre-approval is a formal commitment after the lender verifies your financial information, credit, and income. Pre-approval carries more weight with sellers and gives you a firm interest rate quote. Always get pre-approved before making an offer on a house or car.
Yes. Refinancing means taking out a new loan at a better rate to pay off your existing loan. If interest rates drop significantly (typically 0.5%–1%+ below your current rate), refinancing can save you thousands. However, you'll pay closing costs, so calculate the break-even point. For a mortgage, refinancing usually makes sense if you plan to stay in the home long enough to recoup these costs. Use our calculator to compare your current loan payments with a refinanced loan at the new rate.
PMI (Private Mortgage Insurance) is required when you put down less than 20% on a home. If you borrow $240,000 on a $300,000 home (20% down), you avoid PMI. But if you only put down 10% ($30,000), you'll borrow $270,000 and must pay PMI, which typically costs 0.5–1.5% of your loan amount annually. On a $270,000 loan, that's $1,350–$4,050 per year or $112–$337 per month! Once you've paid off 20% of your home's value, you can request PMI be removed.
Inflation can actually work in your favor with fixed-rate loans. Your monthly payment stays the same, but inflation erodes the real value of that payment over time. For example, if inflation averages 3% annually and you pay $1,000/month, that payment effectively costs you less in "real dollars" each year. This is why longer-term loans (like 30-year mortgages) are more favorable when inflation is high — your payments become easier to afford relative to your future income.
Paying off your loan early is almost always beneficial. The primary advantage is saving on interest — the remaining unpaid months' worth of interest is eliminated. Some older loans had prepayment penalties, but these are rare in modern loans. Some lenders may require you to notify them when paying early. Use our calculator to see how much interest you'd save by paying off your loan 5, 10, or 15 years earlier.