Enter your loan amount, interest rate, and term to instantly calculate your monthly payment, total interest, and full payment breakdown — for mortgages, auto loans, student loans, and personal loans.
Three steps to calculate your monthly payment and full amortization breakdown in seconds.
Type in your loan amount, the annual interest rate your lender quoted, and the loan term in years. Use the rate from your loan offer letter, not the APR, for calculating your payment.
Select monthly, bi-weekly, weekly, or a custom schedule. Bi-weekly payments (26 per year) can shave years off your loan and save thousands in interest compared to 12 monthly payments.
See your periodic payment, total interest across the full loan life, and the principal-to-interest breakdown chart. Adjust any input to instantly compare different loan scenarios.
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What each result means and how it affects your borrowing decision.
This calculator uses the standard amortization formula to break down your principal and interest into equal periodic payments. An amortized loan — which covers mortgages, auto loans, student loans, and personal loans — has a fixed payment amount where each installment gradually shifts from mostly interest to mostly principal. Early in the loan, the lender earns more interest because your outstanding balance is highest. As you pay down principal, less of each payment goes to interest and more reduces your debt.
The three outputs — periodic payment, total interest, and total amount — give you everything you need to evaluate whether a loan fits your budget and to compare offers from competing lenders.
Your interest rate determines your payment amount and is what this calculator uses. APR (Annual Percentage Rate) includes the interest rate plus origination fees and other lender costs — it is always higher than the stated rate and shows the true annual cost of borrowing. When shopping for a loan, compare APR across lenders to identify the real cheapest option.
Most installment loans use monthly compounding, meaning interest accrues on your outstanding principal balance each month. The more often interest compounds relative to payments, the higher the total cost. Bi-weekly payment schedules can reduce this because you make one extra full payment per year, cutting interest faster.
Extending a loan term lowers your monthly payment but significantly increases total interest paid. A shorter term saves money over time at the cost of a higher monthly obligation. Use the calculator to compare a 3-year vs. 5-year vs. 7-year term for the same amount and rate — the total interest difference is often surprising and helps clarify which is smarter for your situation.
Backed by collateral — a home for mortgages, a vehicle for auto loans. Because the lender can repossess the asset if you default, secured loans typically carry lower interest rates. This makes them less expensive to borrow but higher stakes if you fall behind.
Backed only by your creditworthiness and income — personal loans, student loans, and credit cards fall here. Lenders compensate for higher risk with higher interest rates and stricter income and credit score requirements. Because there is no collateral, your debt-to-income ratio becomes a primary approval factor.
Different loan types come with different rate ranges, terms, and qualifying standards. Understanding these differences helps you know whether the rate you are offered is competitive.
Typical term: 15 or 30 years. Rates in 2025 for 30-year fixed mortgages range from roughly 6.5% to 7.5% for well-qualified borrowers. Jumbo loans (above $766,550) often carry slightly higher rates. Requires a minimum down payment (typically 3–20%) and full income and asset documentation.
Typical term: 36–72 months. Rates for new vehicles average 6–8% for buyers with good credit (720+), rising to 10–15%+ for subprime borrowers. Longer auto loan terms (84 months) are available but often result in the borrower being underwater (owing more than the car is worth) for much of the loan.
Typical term: 2–7 years. Rates vary widely — 7–12% for excellent credit, 15–25%+ for fair credit. Personal loans are unsecured, so your credit score and debt-to-income ratio are critical. They are often used for debt consolidation, home improvements, or large purchases without collateral.
Federal student loans for 2024–2025: 6.53% (undergraduate), 8.08% (graduate), 9.08% (PLUS). Private student loans vary by credit and can range from 4% to 14%. Federal loans offer income-driven repayment plans and forgiveness programs not available with private loans.
Your credit score is the single biggest factor in the rate you qualify for on most loans. Borrowers with scores above 720 typically get the best advertised rates. A score of 620–689 may mean 3–5 percentage points higher, which can add tens of thousands of dollars to total interest on a large loan. Improving your score before applying — even by 20–30 points — often yields meaningful savings.
The amortization formula step-by-step — with a real worked example.
M = P × [ r(1 + r)^n ] / [ (1 + r)^n − 1 ]
M = monthly payment
P = principal loan amount
r = monthly interest rate (annual rate ÷ 12)
n = total number of payments (years × 12)
Identify the variables
P = $25,000 | Annual rate = 7% | Term = 5 years (60 months)
Calculate monthly rate (r)
r = 7% ÷ 12 = 0.07 ÷ 12 = 0.005833
Calculate the numerator: P × r × (1 + r)^n
(1 + 0.005833)^60 = 1.41763 | Numerator = $25,000 × 0.005833 × 1.41763 = $206.72
Calculate the denominator: (1 + r)^n − 1
1.41763 − 1 = 0.41763
Divide: M = 206.72 ÷ 0.41763
M = $494.97 per month
Each payment in the schedule above splits between interest and principal. In month 1, the outstanding balance is the full $25,000, so interest = $25,000 × 0.5833% = $145.83. The remaining $349.14 reduces principal. By month 60, your balance is nearly zero, so almost the entire $494.97 payment is principal.
| Month | Payment | Interest | Principal | Balance |
|---|---|---|---|---|
| 1 | $494.97 | $145.83 | $349.14 | $24,650.86 |
| 12 | $494.97 | $124.51 | $370.46 | $21,003.55 |
| 30 | $494.97 | $86.28 | $408.69 | $14,376.11 |
| 60 | $494.97 | $2.88 | $492.09 | $0 |
Real scenarios where knowing your loan payment before you sign saves you money.
On a $350,000 mortgage at 7%: a 30-year loan costs $2,329/month and $488,281 in total interest. The same loan over 15 years costs $3,145/month but only $216,103 in interest — a savings of over $272,000. If you can afford the higher payment, the 15-year option builds equity much faster and dramatically reduces your total cost of homeownership. Enter both scenarios in the calculator above to compare.
Most financial advisors recommend keeping total car costs (payment + insurance + fuel) under 15–20% of take-home pay. For someone earning $5,000/month after taxes, that is $750–$1,000/month for all car expenses. If insurance costs $150/month and fuel runs $150/month, the maximum comfortable car payment is $450–$700. Use this calculator to find the loan amount that fits your budget — not the payment a dealer pushes you toward.
Credit card debt at 20–24% APR can be dramatically reduced by consolidating into a personal loan at 8–12%. For example, $15,000 in credit card debt at 22% with minimum payments may never be paid off. The same $15,000 in a 3-year personal loan at 10% costs $484/month and is fully paid in 36 months with just $2,424 in total interest — compared to potentially tens of thousands on revolving credit card debt.
Federal student loans offer income-driven repayment (IDR) and extended plans not available with private loans. For a $40,000 federal loan at 6.53% on a standard 10-year plan, the payment is $452/month. Extending to 25 years drops it to $271/month but adds $21,000+ in extra interest. Use this calculator to understand the true cost of extended repayment before choosing a plan. For state-specific student aid resources, California residents can visit the California Student Aid Commission (CSAC); Texas residents can check the Texas Higher Education Coordinating Board (THECB).
On a $200,000 mortgage at 7% over 30 years, your regular payment is $1,331/month. Adding just $100 extra per month reduces your payoff by nearly 3.5 years and saves approximately $26,500 in interest. The key is to ensure your lender applies extra payments directly to principal — confirm this before making additional payments. Always check your loan agreement for prepayment penalties, which some lenders impose within the first 3–5 years.
What to look for beyond the monthly payment — and how to use this calculator to choose wisely.
When you receive multiple loan offers, do not focus on the monthly payment alone. Always calculate total interest to compare the true cost. The table below shows a $30,000 personal loan at 8% across three common terms:
| Term | Monthly Payment | Total Interest | Total Cost |
|---|---|---|---|
| 3 years | $940 | $3,840 | $33,840 |
| 5 years | $608 | $6,497 | $36,497 |
| 7 years | $467 | $9,228 | $39,228 |
The 7-year term looks attractive at $467/month, but costs $5,388 more in interest than the 3-year term. If you can manage the $940/month, you save substantially. If cash flow is tight, the longer term may still make sense — but go in knowing the full cost.
Understanding what affects your approval and rate helps you apply when you are in the strongest position:
720+ typically qualifies for the best rates. Below 620 often means subprime rates or denial for unsecured loans. Check your score for free via AnnualCreditReport.com before applying.
Most lenders prefer a DTI under 43%. Divide your total monthly debt payments by gross monthly income. A $3,000/month income with $1,000 in existing debts gives a 33% DTI — a strong position for approval.
For secured loans (mortgages, auto), LTV is the loan amount as a percentage of the asset value. Lower LTV means lower risk for the lender and often a better rate. 80% LTV on a mortgage avoids private mortgage insurance (PMI).
Most lenders want at least 2 years of steady employment or self-employment income. Changing jobs just before applying can complicate approvals even with an excellent credit score.
Answers to common questions about loan calculations and repayment.
Use the formula M = P × [r(1+r)^n] / [(1+r)^n − 1], where P is the principal, r is the monthly rate (annual rate ÷ 12), and n is total payments. For a $25,000 loan at 7% over 5 years, this yields $494.97/month. Or just enter your figures above — the calculator does the math instantly.
An amortization schedule shows every payment over the loan's life — how much goes to interest, how much reduces principal, and the remaining balance after each payment. Early payments are mostly interest because your balance is highest. Over time, more of each payment goes to principal as the balance falls.
Significantly. A $30,000 loan at 8%: a 3-year term costs $3,840 in total interest ($940/month). A 7-year term costs $9,228 ($467/month) — more than double the interest for a $473/month saving. Longer terms cost far more over time; shorter terms save money if you can manage the higher payment.
The interest rate is the base cost of borrowing. APR includes the interest rate plus lender fees such as origination fees and points — giving a more accurate picture of total loan cost. When comparing multiple offers, always compare APRs, not just interest rates.
It depends on your rate and term. At 7% over 5 years: roughly $5,581 in interest. At 7% over 7 years: about $7,868. At 10% over 5 years: approximately $8,162. Enter your specific rate and term above for an exact figure tailored to your loan.
Extra payments reduce principal directly, which lowers the base for future interest calculations. On a $200,000 mortgage at 7% for 30 years, adding $100/month saves over $26,000 in interest and cuts nearly 3.5 years off the loan. The earlier you start, the greater the savings. Always confirm with your lender that extra payments are applied to principal and check for prepayment penalties.
Most lenders offer their best rates to borrowers with scores of 720 or higher. Scores of 690–719 still qualify for good rates. Below 630, you're in subprime territory with substantially higher rates. A 100-point score improvement can save 3–5 percentage points on your rate, potentially adding up to tens of thousands of dollars in savings over a large loan.
This calculator uses the same amortization formula as banks for fixed-rate installment loans and is highly accurate for standard monthly payment calculations. Minor differences may occur due to lender rounding, day-count conventions, or fees not included here. For variable-rate loans, use your current rate as an estimate — future payments may change as rates adjust.
Yes — it works for any fixed-rate installment loan: mortgages, auto loans, student loans, personal loans, and business loans. Enter the loan amount, annual interest rate, and term in years. The payment frequency selector lets you calculate weekly, bi-weekly, monthly, or custom schedules to match your lender's payment structure.
Evaluate your debt-to-income ratio (most lenders prefer under 43%), the total cost of borrowing — not just the monthly payment — origination fees, prepayment penalties, and whether the rate is fixed or variable. Use this calculator to model two or three loan scenarios before you sign, so you understand the real long-term cost of each option.