Calculate monthly loan payments, total interest, and total cost for any fixed-rate loan. Switch to Advanced mode for full amortization schedules and extra payment analysis. Works for mortgages, car loans, personal loans, and business financing.
Current average: 6–8% for mortgages, 5–12% for auto loans
Monthly Payment
$1,580.17
Total Interest
$318,861.22
Total Cost
$568,861.22
over 360 months
| Term | Monthly Payment | Total Interest | Total Cost |
|---|---|---|---|
| 10 years | $2,838.70 | $90,643.93 | $340,643.93 |
| 15 years | $2,177.77 | $141,998.31 | $391,998.31 |
| 20 years | $1,863.93 | $197,343.88 | $447,343.88 |
| 25 years | $1,688.02 | $256,405.37 | $506,405.37 |
| 30 years | $1,580.17 | $318,861.22 | $568,861.22 |
Understanding how loan payments work is essential whether you're buying a home, financing a car, or taking out a personal loan. This guide explains the math behind monthly payments, how interest compounds, and strategies to pay less over the life of any loan.
Every fixed-rate loan uses the same standard formula to calculate your monthly payment. The formula is: M = P × [r(1+r)n] / [(1+r)n – 1], where:
For example, a $250,000 mortgage at 6.5% for 30 years gives a monthly payment of approximately $1,580. Over the life of the loan, you'd pay about $319,000 in interest — more than the original loan amount. This is why even small rate differences matter enormously.
In the first years of a loan, the majority of each payment covers interest rather than principal. This is because interest is calculated on the remaining balance, which is highest at the start. As you pay down the principal, the interest portion shrinks and more of each payment goes toward the actual debt. This is called amortization.
On a 30-year mortgage, it typically takes 18–20 years before more than half of each payment goes to principal. This is why making extra payments early in the loan has a disproportionately large impact.
Adding even a small amount to your monthly payment can dramatically reduce both the total interest and the loan term. Here's why: extra payments go directly to reducing the principal, which means less interest accrues in every subsequent month. It's a compounding effect that works in your favor.
Consider a $250,000 mortgage at 6.5% for 30 years. Adding just $200/month in extra payments would save approximately $108,000 in interest and pay off the loan nearly 8 years early. Use the Advanced mode above to model your own scenario.
This calculator is designed for fixed-rate loans, where the interest rate stays the same for the entire term. Variable (or adjustable) rate loans start with a lower rate but can change over time based on market conditions. While variable rates can save money initially, they introduce uncertainty. For budgeting purposes, fixed-rate calculations give you a reliable monthly payment you can plan around.
The loan term is one of the most impactful decisions you'll make. Shorter terms mean higher monthly payments but significantly less total interest. A 15-year mortgage at the same rate as a 30-year mortgage will have roughly 40–50% higher monthly payments, but you'll pay less than half the total interest. Use the Term Comparison table in Simple mode to see exact numbers for your loan.
Different loan types carry different interest rates and terms. As of 2025–2026, typical ranges include:
Your actual rate depends on your credit score, down payment, loan-to-value ratio, and the lender's terms. Always shop around — even a 0.25% difference in rate can save thousands over the life of a mortgage.
To secure the lowest possible interest rate, focus on these factors: maintain a credit score above 740, make a down payment of at least 20% (for mortgages), keep your debt-to-income ratio below 36%, and compare offers from at least 3–5 lenders. Getting pre-approved by multiple lenders within a 14-day window counts as a single credit inquiry, so it won't hurt your score.
Once you have a loan, staying on top of payments is crucial. If you're a freelancer or business owner managing client invoices, tools like our Invoice Reminder Schedule Builder and Invoice Reminder Email Generator can help ensure consistent cash flow — so you can always make your loan payments on time.
Follow these guidelines to minimize your borrowing costs and pay off loans faster.
Always compare 15-year vs 30-year (or shorter vs longer) terms to see the true cost difference.
Even $50/month extra on a mortgage can save thousands and shave years off your loan.
Your credit score directly impacts your interest rate. Improving it before borrowing can save significantly.
Monthly payments don't include insurance, taxes, or HOA fees. Budget for the full picture.
Everything you need to know about loan payments and amortization.
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