How is a loan payment calculated?

A loan payment is calculated using the formula M = P[r(1+r)^n] / [(1+r)^n - 1], where P is the loan principal, r is the monthly interest rate (annual rate divided by 12), and n is the total number of monthly payments. This gives you the fixed monthly payment needed to fully repay the loan.

What is the difference between APR and interest rate?

The interest rate is the cost of borrowing the principal. APR (Annual Percentage Rate) includes the interest rate plus any additional fees and costs associated with the loan, giving a more complete picture of the true cost. APR is always equal to or higher than the interest rate.

What is a good interest rate for a personal loan?

A good personal loan interest rate is generally below 10% APR for borrowers with excellent credit (720+). Average rates range from 10–20% for good credit. Rates above 20% are considered high and typically apply to borrowers with fair or poor credit scores.

Should I choose a shorter or longer loan term?

A shorter loan term means higher monthly payments but significantly less total interest paid. A longer term lowers monthly payments but costs more overall. Choose a shorter term if you can comfortably afford the higher payment — you'll save money in the long run.

Can I pay off a loan early?

Yes, most loans allow early repayment. Paying extra toward principal reduces your balance faster and saves interest. However, some loans have prepayment penalties — always check your loan agreement before making extra payments.

Loan Calculator – Monthly Payment, Total Interest & Amortization

How to Use This Calculator

Enter the following to calculate your loan payment instantly:

1. Loan Amount

The total amount you plan to borrow. Use the slider or type directly. For personal loans this is usually $1,000–$50,000.

2. Interest Rate

Your annual interest rate (APR). Select a loan type at the top to auto-fill a typical rate, or enter your lender's exact rate.

3. Loan Term

How long you have to repay. Shorter terms mean higher payments but less total interest. Longer terms lower payments but cost more overall.

4. Extra Payment (Optional)

Adding even a small extra payment each month can save significant interest and shorten your loan term. Toggle it on to see exactly how much you save.

Loan Payment Formula

Loan payments are calculated using the standard amortization formula:

M = P × [r(1+r)ⁿ] ÷ [(1+r)ⁿ - 1]

M = Monthly payment
P = Loan principal
r = Monthly rate (annual rate ÷ 12)
n = Total number of payments

Example: $15,000 loan at 11.5% for 3 years (36 months):

Monthly rate = 11.5% ÷ 12 = 0.9583%
n = 36 payments
Monthly payment = $494
Total paid = $17,789
Total interest = $2,789

Typical Loan Interest Rates

Rates vary by loan type and credit score. Here are typical ranges:

Loan Type	Good Credit	Average Credit
Personal Loan	6–13%	14–24%
Auto Loan (new)	4–7%	8–13%
Auto Loan (used)	6–9%	10–16%
Student Loan	4–7%	7–12%
Business Loan	6–11%	12–25%

Always shop multiple lenders — rates can vary by 3–5% for the same borrower profile.

How to Pay Off a Loan Faster

Make Extra Monthly Payments

Even $50–$100 extra per month reduces principal faster, cutting both the loan term and total interest significantly.

Make Bi-Weekly Payments

Paying half your monthly payment every two weeks results in 26 half-payments (13 full payments) per year instead of 12 — one extra payment annually.

Refinance at a Lower Rate

If your credit improves or rates drop, refinancing can lower your rate and save thousands in interest.

Round Up Your Payments

If your payment is $347, pay $400. The extra $53 goes directly to principal with zero effort.

Frequently Asked Questions

Monthly loan payments use the amortization formula: M = P[r(1+r)^n] / [(1+r)^n - 1]. P is the principal, r is the monthly interest rate (annual rate ÷ 12), and n is the total number of payments. Our calculator applies this instantly as you adjust inputs.

The interest rate is the basic cost of borrowing. APR (Annual Percentage Rate) includes the interest rate plus fees and other costs, giving the true annual cost. APR is always equal to or higher than the stated interest rate. Always compare loans using APR.

A shorter term means higher monthly payments but you pay far less total interest. A longer term lowers monthly payments but significantly increases total cost. If you can comfortably afford a shorter term, it's almost always the better financial decision.

Many loans allow early repayment without penalty, but some charge prepayment fees — typically 1–3% of the remaining balance. Always check your loan agreement before making extra payments. If your loan has no prepayment penalty, paying early saves meaningful interest.

Your credit score is one of the biggest factors in your loan rate. Borrowers with excellent credit (750+) typically qualify for rates 5–10% lower than borrowers with fair credit (580–669). Improving your score before applying can save hundreds or thousands of dollars over the loan term.

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