Free Loan Calculator: Monthly Payment, Total Interest & Amortization Schedule
Calculate any loan payment in seconds. Enter loan amount, rate, and term to instantly see monthly payment, total interest, and full amortization schedule.
What does a loan calculator show you?
A loan calculator shows your monthly payment, total interest paid, and full amortization schedule — the month-by-month breakdown of principal versus interest. Enter three inputs: loan amount, annual interest rate, and loan term. The calculator uses the standard amortization formula to compute your fixed monthly payment and project how your balance decreases over time.
Initializing Loan Engine...
Taking out a loan is one of the most significant financial decisions most Americans make, whether it's buying a car, covering a medical bill, consolidating debt, or financing a home renovation. The monthly payment is the number everyone focuses on. But it's only part of the story.
This loan calculator gives you the full picture in seconds. Enter your loan amount, interest rate, and repayment term. Instantly see your fixed monthly payment, total interest cost over the life of the loan, and a complete amortization schedule that breaks down every payment showing exactly how much goes toward principal versus interest each month.
No signup. No email required. No ads. Just the numbers you need to borrow smarter.
How a Loan Calculator Works
Every fixed-rate installment loan uses the same mathematical formula behind the scenes: the present value of an annuity equation. What that means in plain terms is this: your lender figures out what equal monthly payment, paid over your full loan term, exactly pays off your principal plus all the interest owed.
Three numbers drive every calculation:
- Loan amount (principal): the amount you borrow
- Annual interest rate (APR): what the lender charges per year
- Loan term: how many months (or years) you have to repay
Plug those three numbers in and this calculator handles the rest, including building out your full amortization schedule so you can see how your balance shrinks month by month.
Understanding Your Monthly Payment
Your monthly payment is fixed for the entire loan term on a standard amortizing loan. But what's inside that payment changes every single month. In month one, a larger share of your payment goes toward interest. By the final payment, almost all of it is principal.
Here's a real example that makes this concrete: Say you borrow $25,000 for a home improvement project at 7.5% APR over 60 months (5 years).
| Month | Payment | Principal | Interest | Remaining Balance |
|---|---|---|---|---|
| 1 | $500.93 | $344.68 | $156.25 | $24,655.32 |
| 12 | $500.93 | $356.56 | $144.37 | $23,021.10 |
| 30 | $500.93 | $381.50 | $119.43 | $19,046.30 |
| 48 | $500.93 | $415.33 | $85.60 | $13,280.15 |
| 60 | $500.93 | $497.81 | $3.12 | $0.00 |
Total paid over 60 months: $30,055.80. Total interest cost: $5,055.80. That's the real price of borrowing, not the $25,000 headline, but the $30,055 you actually pay. Knowing this number upfront helps you decide whether a shorter term (higher payment, less interest) or longer term (lower payment, more interest) makes sense for your budget.
Loan Type Quick Reference: Which Rate to Expect
One of the most common questions users have: "What interest rate should I enter?" Here's a quick-reference guide based on average rates for creditworthy borrowers in the USA as of 2026:
| Loan Type | Typical Term | Average APR (Good) | Average APR (Fair) |
|---|---|---|---|
| Personal Loan | 24–84 months | 7%–12% | 15%–25% |
| Auto Loan (New) | 36–72 months | 5%–8% | 10%–18% |
| Auto Loan (Used) | 24–60 months | 6%–10% | 12%–22% |
| Student (Federal) | 10–25 years | 6.5%–8% | Fixed |
| Home Improvement | 24–144 months | 7%–13% | 16%–28% |
| Debt Consolidation | 24–84 months | 8%–14% | 18%–29% |
| SBA Loan | 10–25 years | 6%–8% | Varies |
These are reference ranges. Your actual rate depends on your credit score, income, debt-to-income ratio, and lender. Use these as starting inputs when comparing loan scenarios. Then get real quotes from lenders and run your actual offered rate through this calculator.
How Loan Term Affects Your Total Cost
Stretching your loan term lowers your monthly payment, but it significantly increases the total interest you pay. This is the trade-off that catches most borrowers off guard. Here's how dramatic the difference is on a $20,000 personal loan at 9% APR:
| Loan Term | Monthly Payment | Total Interest | Total Paid |
|---|---|---|---|
| 24 months | $913.82 | $1,931.68 | $21,931.68 |
| 36 months | $635.99 | $2,895.64 | $22,895.64 |
| 48 months | $497.70 | $3,889.60 | $23,889.60 |
| 60 months | $415.17 | $4,910.20 | $24,910.20 |
| 84 months | $320.13 | $6,890.92 | $26,890.92 |
The 84-month loan saves you $493/month compared to the 24-month loan, but costs you $4,959 more in total interest. That's the hidden cost of "affordable" payments. Use this calculator to find the shortest term your budget can actually handle.
The Extra Payment Strategy — When $100/Month Saves You Thousands
Most loan calculators stop at the scheduled payment. This section covers what none of the big competitors explain clearly: the extra payment math.
On a $30,000 auto loan at 7% APR over 72 months, your scheduled payment is $456.20/month. Total interest: $2,846.40. But if you add just $100 extra per month to principal:
- You pay off the loan 14 months early
- You save $782 in total interest
- Your "extra" $100 saves you $7.82 for every dollar you put in
The math works best early in the loan when your balance is highest. Even a one-time lump sum payment, a tax refund a bonus applied to principal in month 6 or 12 has an outsized impact on total interest. Run your own scenario using the amortization schedule: look at your remaining balance after 6 months, then recalculate with a lower principal.
Loan Calculator vs. APR Calculator: What's the Difference?
Your monthly payment and your loan's APR are two different things. Your payment is calculated on the interest rate alone. APR includes origination fees, closing costs, and other charges. It's the true annual cost of borrowing expressed as a percentage.
A lender quoting you 6.9% with a 2% origination fee on a $20,000 loan is actually charging you more than a lender quoting 7.5% with no fees. Always ask for both the interest rate and the APR when comparing loan offers. Enter the interest rate in this calculator to see your payment but compare APRs across lenders to find the actual best deal.
What Credit Score Do You Need to Get a Good Rate?
Credit score is the single biggest driver of your interest rate outside of loan type. Here's how lenders typically tier borrowers in 2026:
| Score Range | Credit Tier | Typical APR |
|---|---|---|
| 760+ | Exceptional | 6%–9% |
| 720–759 | Very Good | 9%–13% |
| 680–719 | Good | 13%–17% |
| 640–679 | Fair | 17%–22% |
| 580–639 | Poor | 22%–30%+ |
| Below 580 | Very Poor | Hard to qualify |
A 100-point credit score improvement can save you $3,000–$8,000 in total interest on a $25,000 personal loan over 5 years. If your score is below 680, it's worth spending 3–6 months improving it before applying, the savings are that significant.
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