Loan Calculator
Use this loan calculator to estimate monthly payment, total interest, and total repayment for personal loans, auto loans, student loans, business loans, and other fixed-term installment borrowing. Enter the loan amount, annual interest rate, and repayment term to compare lender offers, test shorter-vs-longer payoff timelines, and understand how rate changes affect the full cost of borrowing. The tool handles 0% interest scenarios, works for general installment-loan planning, and gives you a quick affordability check before you borrow or refinance. Calculations run instantly in your browser with no signup required.
How it works: Enter your loan amount, annual interest rate, and duration to calculate your monthly EMI. The calculator uses the standard EMI formula: rate, and n is number of months.
What Is a Loan Calculator?
A loan calculator computes your monthly payment and total interest for any installment loan — personal loans, auto loans, student loans, business loans, or debt consolidation. The calculation uses the standard amortization formula: each month you pay a fixed amount, with the split between interest and principal shifting over time. Early payments are mostly interest; later payments go mostly to principal. This calculator shows both the monthly payment and the total cost, letting you compare offers before you commit.
How to Use This Loan Calculator
Enter the loan amount (principal), the annual interest rate (APR), and the loan term in months. The calculator instantly shows your monthly payment, total interest, and total repayment amount. To compare two offers, run each APR and term combination separately and compare the total interest rows. Lower monthly payment is not always better — a longer term saves on cash flow but almost always costs more total.
Worked Example: Maria's $15,000 Debt Consolidation Loan
Maria has $15,000 in credit card debt across three cards averaging 21% APR. A credit union offers her a personal loan at 9.5% APR for 48 months.
Monthly Payment: $377
Loan: $15,000 | Rate: 9.5% APR | Term: 48 months
Total Interest: $3,096 | Total Repaid: $18,096
Credit cards at 21% APR (min. payments only) would cost $9,800+ in interest and take 8+ years to clear
Loan Payment Reference Table — 9% APR, Various Amounts & Terms
| Loan Amount | 24-mo Payment | 36-mo Payment | 60-mo Payment | Total Interest (60mo) |
|---|---|---|---|---|
| $5,000 | $228 | $159 | $104 | $1,240 |
| $10,000 | $456 | $318 | $208 | $2,480 |
| $15,000 | $685 | $477 | $311 | $3,660 |
| $20,000 | $913 | $636 | $415 | $4,900 |
| $30,000 | $1,369 | $954 | $622 | $7,320 |
| $50,000 | $2,282 | $1,590 | $1,037 | $12,220 |
All payments at 9% APR. Actual results vary with your rate.
Key Loan Concepts: Principal, APR, Term, and Amortization
Principal is the amount borrowed. APR (Annual Percentage Rate) is the yearly cost of the loan including fees, expressed as a percentage. Term is the repayment period in months. These three variables fully determine your monthly payment via the amortization formula: M = P × [r(1+r)⊃n] ÷ [(1+r)⊃n − 1], where r = APR/12 and n = number of months.
Amortization means your loan balance decreases with each payment. Early payments are mostly interest; later payments are mostly principal. A fully amortizing loan reaches $0 balance at the final payment. Interest-only or balloon loans do not amortize fully and leave a large lump-sum payment at maturity.
Shorter vs. Longer Term — Real Numbers on $20,000 at 9% APR
| Term | Monthly Payment | Total Interest | Total Repaid | Extra Interest vs. 24mo |
|---|---|---|---|---|
| 24 months | $913 | $1,912 | $21,912 | — |
| 36 months | $636 | $2,896 | $22,896 | +$984 |
| 48 months | $498 | $3,904 | $23,904 | +$1,992 |
| 60 months | $415 | $4,900 | $24,900 | +$2,988 |
| 84 months | $321 | $6,964 | $26,964 | +$5,052 |
Tips Before Taking Any Loan
Always compute total repayment (monthly × months) before signing, not just the monthly payment. Lenders promote long terms because they look affordable — but a 7-year loan at 9% costs $5,052 more in interest than a 2-year loan on the same $20,000. If you can afford a higher monthly payment, shorter terms save significant money. Also check for prepayment penalties — most personal and auto loans have none, but some business loans do. If there’s no penalty, making one extra payment per year on a 5-year loan typically cuts 4–6 months off the payoff and saves hundreds in interest.
Frequently Asked Questions About Loan Calculators
How do I calculate a loan payment?
Use the formula M = P × [r(1+r)^n] / [(1+r)^n − 1] where P = loan amount, r = monthly interest rate (APR/12), and n = number of payments. For a $10,000 loan at 9% APR over 36 months: r = 0.09/12 = 0.0075, n = 36, M = $318/month.
What is the difference between APR and interest rate?
The interest rate is the base cost of borrowing. APR includes the interest rate plus fees (origination fees, closing costs) expressed as a yearly percentage. APR gives a more accurate picture of total cost. Always compare APRs when shopping loans.
Can I pay off a loan early without penalty?
Most personal and auto loans allow early payoff with no penalty. Business loans and some mortgages may include prepayment penalties. Check your loan agreement under ‘prepayment’ or ask the lender directly before assuming early payoff is free.
How does a loan affect my credit score?
Applying causes a small hard inquiry (−5 points). Once open, the loan improves your credit mix. Regular on-time payments are the single biggest positive factor in your credit score. Missing a payment drops your score 50–100 points, so only borrow what you can repay reliably.
What is a good interest rate for a personal loan?
In 2024–2025, below 10% APR is excellent for a personal loan (requires 720+ credit). 10–15% is good. Above 20% is expensive. Rates above 36% (payday/predatory loans) should be avoided — the total interest often exceeds the original principal.
Should I choose a shorter or longer loan term?
Shorter terms cost more per month but significantly less total. If you can afford the higher payment, shorter is almost always better financially. Choose a longer term only if cash flow is genuinely tight — not just to lower the payment.
Related Calculators
Personal Loan Calculator
Estimate payment and total cost for unsecured personal loans
Car Payment Calculator
Car loan with trade-in, tax, and down payment
Mortgage Calculator
Home loan with taxes, insurance, and PMI
Amortization Calculator
Full payment-by-payment schedule for any loan
Debt Payoff Calculator
Plan payoff of multiple loans with avalanche or snowball
Refinance Calculator
Model savings from refinancing an existing loan