# Loan Calculator Calculate loan payments, total interest cost, and the full payoff schedule for personal, auto, or business loans in seconds. --- - **Canonical URL:** https://dothecalculation.com/calculators/loan-calculator - **Category:** Financial calculators - **Publisher:** Do The Calculation (https://dothecalculation.com) - **Cost:** Free, no account or sign-up required - **Privacy:** Runs entirely in the browser; inputs are never sent to a server - **Methodology:** https://dothecalculation.com/methodology - **Reviewed by:** Sheharyar Shahid, Data Analyst & Advanced Excel Specialist (DAE) (https://dothecalculation.com/about/team/sheharyar-shahid) --- ## Loan Calculator — Monthly Payment and Total Interest Model loan payments, total interest costs, amortization timelines, and payment structures before comparing lender offers. - Payment summary, principal and interest splits - Amortization schedule preview - Visual loan decay chart ## How to Use This Calculator Enter the loan principal, the annual interest rate, and the term in years. The calculator applies standard fixed-rate amortization to return your monthly payment, total payment, and total interest over the life of the loan. ## Worked Example: $25,000 at 7% Over 5 Years Principal $25,000, annual interest rate 7%, term 5 years (60 monthly payments). Monthly payment: ≈ $495.03. Total payment over 5 years: ≈ $29,701.80. Total interest paid: ≈ $4,701.80 — about 18.8% on top of the original principal at this rate and term. Stretching the same loan to 7 years would lower the monthly payment but increase total interest paid, the standard trade-off behind every loan term decision. ## The Anatomy of an Amortizing Installment Loan An installment loan is a closed-end borrowing agreement where a fixed principal amount is advanced to the borrower and repaid over a set term with equal periodic payments. Understanding this structure is essential for personal loans, auto financing, and consumer installment plans. Unlike revolving credit (such as credit cards), installment loans have a defined end date. Each monthly payment is split between covering the interest accrued on the remaining balance and paying down the principal. In the early months, because the principal balance is high, a larger portion of the payment goes toward interest. In the later months, the ratio reverses, accelerating equity pay-down. ## The Amortization Payment Formula To calculate the exact monthly payment required for a fixed-rate amortizing loan, lenders apply standard interest amortization math: $$PMT = P \times \frac{r(1 + r)^n}{(1 + r)^n - 1}$$ Where: * \(PMT\) is the equal monthly payment. * \(P\) is the principal loan amount borrowed. * \(r\) is the monthly interest rate (Annual Percentage Rate divided by 12 months). * \(n\) is the total number of monthly payments (Term Years multiplied by 12). This equation ensures the loan is exactly paid to zero by the final month. It shows why extending the loan term (e.g., from 3 to 5 years) reduces the monthly payment but directly increases the total interest paid, as interest is given more time to compound on the outstanding balance. ## The Real Cost of Borrowing: Interest vs. Principal The sticker price of a loan is not its true cost. The actual cost is the principal plus the total interest accrued over the life of the loan. This tool calculates both, showing the interest drag. Borrowers often negotiate monthly payments instead of total interest. Lenders can easily meet a monthly payment target by extending the term, which dramatically inflates the total amount paid. Always verify the **Total Repayment** and **Annual Percentage Rate (APR)** before signing. ## Fees, Prepayment Rules, and Debt Consolidation When comparing personal loans, verify the **Origination Fee**, which ranges from 1% to 8% and is often deducted from the loan payout, meaning you receive less cash than you borrow. Also, check for **Prepayment Penalties** (fees charged if you pay off the loan early). Selecting a loan with no prepayment penalty allows you to make extra payments toward the principal, cutting total interest costs and accelerating your debt-free timeline. ## Related Calculators Use the [payment calculator](/calculators/payment-calculator) to model prepayments and alternate payment frequencies, or the [debt payoff calculator](/calculators/debt-payoff-calculator) if you are juggling this loan alongside credit cards or other balances. ## Frequently asked questions ### Why does a longer loan term cost more? A longer term spreads the principal repayment over more months, lowering the monthly payment. However, it gives interest more time to compound, which increases the total lifetime interest paid. ### Can I use this for a personal loan? Yes. The calculator applies to most standard fixed-rate personal loans, peer-to-peer loans, and installment contracts where payments are equal and regular. ### Does the payment include lender fees? No. The payment is calculated using the principal, interest rate, and term. Prepayment, origination, or insurance fees are not included and should be factored in separately. ### What is the difference between APR and interest rate? The interest rate is the base cost of borrowing the principal. The APR (Annual Percentage Rate) includes the interest rate plus upfront fees (like origination fees), representing the true annual cost. ### How does making extra payments shorten the loan? Extra payments are applied directly to the principal balance. Reducing the principal reduces the base on which interest is calculated for all subsequent months, shortening the term. ### What is a prepayment penalty? A prepayment penalty is a fee charged by some lenders if you pay off the loan balance before the end of the agreed term, compensating them for lost interest. ### What is an origination fee? An origination fee is an upfront fee charged by lenders to process a new loan application, typically deducted from the loan proceeds at funding. ### How does my credit score affect my loan options? Higher credit scores indicate lower risk to lenders, qualifying you for lower interest rates and lower origination fees, which directly reduces borrowing costs. ### What is a secured vs. unsecured loan? Secured loans require collateral (like a car or home) that the lender can seize if you default. Unsecured loans (like personal loans) require no collateral but carry higher interest rates. ### How is interest calculated each month? Monthly interest is calculated by multiplying the outstanding principal balance by the monthly interest rate (APR / 12). The remainder of your payment goes to principal. ## Related concepts - **APR** — Annual Percentage Rate: the complete annual cost of borrowing including fees. - **Amortization** — The mathematical breakdown of debt payments into principal and interest over a fixed timeline. - **Origination Fee** — An upfront processing fee deducted from the loan payout by the lender. ## Related guides - [Loan Payment Guide: Formula, Interest, and Total Cost](https://dothecalculation.com/blog/finance/loan-payment-guide) — Learn how fixed loan payments are calculated, why term length changes total interest, and how the DTC loan calculator matches amortization math. - [Debt Snowball vs Avalanche: Compare Payoff Methods](https://dothecalculation.com/blog/finance/debt-snowball-vs-avalanche) — Compare debt snowball and avalanche payoff methods, see how ordering changes interest and timing, and model both with the DTC calculator. ## Related calculators - [Auto Loan Calculator](https://dothecalculation.com/calculators/auto-loan-calculator) — Estimate monthly car payments, total financing cost, and interest owed based on vehicle price, down payment, and loan term. - [Student Loan Calculator](https://dothecalculation.com/calculators/student-loan-calculator) — Estimate student loan monthly payments, total interest paid, and payoff timeline based on your balance, rate, and repayment term. - [Amortization Calculator](https://dothecalculation.com/calculators/amortization-calculator) — Build a full principal and interest amortization schedule for any loan to see exactly how each payment reduces your balance. - [Credit Card Payoff Calculator](https://dothecalculation.com/calculators/credit-card-payoff-calculator) — Plan exactly how long it will take to pay off credit card debt and calculate interest savings from higher monthly payments. - [Simple Interest Calculator](https://dothecalculation.com/calculators/simple-interest-calculator) — Calculate simple interest, the final amount owed, and total repayment amount based on your principal, rate, and loan term. - [Biweekly Mortgage Payment & Payoff Accelerator](https://dothecalculation.com/calculators/biweekly-mortgage-payoff-calculator) — Compare biweekly versus monthly mortgage payment schedules to calculate how much faster you pay off your loan and total interest saved. --- _This tool is for educational purposes only. Debt repayment schedules, interest accruals, auto loan terms, student loan programs, and credit card minimum payments depend on individual credit profiles, lender underwriting policies, and contract terms. Always consult a certified financial planner, credit counselor, or lending professional before making major debt consolidation or borrowing decisions._ --- _Source: [Do The Calculation](https://dothecalculation.com/calculators/loan-calculator). Quote freely with attribution and a link to this page._