Loan Calculator

Simple and powerful loan calculator for personal loans, auto loans, and student loans. Calculate monthly payments, interest totals, and payoff dates.

Calculator Inputs

$
Total initial borrowed sum.
mo
Total duration of repayment in months.
%
Annual percentage rate (APR).

Calculated Results

Monthly Payment
$461.45
Total Principal $25,000
Total Interest $2,687
Total Repaid $27,687
Values calculate live as you adjust inputs.

About Loan Calculator

Your monthly payment tells you how much you need to repay regularly, but the total interest shows what borrowing actually costs beyond the original amount. To calculate it, subtract the original loan principal from the total amount repaid.

Total Interest = Total Repayment − Loan Amount

For example, if you borrow $15,000 and repay $17,400 over the full loan term, your total interest is $2,400. This amount represents the cost of borrowing, excluding any additional fees that are not included in the repayment calculation.

How Loan Amount, Interest Rate, and Term Affect Payments

Three factors have the greatest influence on a typical fixed-rate loan payment.

  • Loan amount: Borrowing more generally increases both your monthly installment and the total interest paid.
  • Interest rate: A higher rate increases borrowing costs when the loan amount and repayment term remain unchanged.
  • Loan term: Extending repayment over more months usually lowers each installment, but it can increase the total interest paid because interest accrues over a longer period.

For example, a five-year loan will generally have higher monthly payments but lower total interest than the same loan spread over seven years, assuming the same interest rate and repayment structure. Comparing both figures helps you see the trade-off between affordable monthly payments and the overall cost of borrowing.

What Is Included in a Monthly Loan Payment?

For a standard fixed-rate installment loan, each scheduled payment covers two main components: principal and interest.

The principal is the amount you borrowed, while interest is charged for borrowing the outstanding balance. Early in the repayment schedule, a larger share of each payment typically goes toward interest. As the balance decreases, less interest accrues, allowing more of each payment to reduce the principal.

Your actual payment may also include lender fees, insurance, or other charges, depending on the loan agreement. These costs are not necessarily included in a basic loan calculator’s estimate, so check what your lender includes in its quoted payment.

How to Compare Loan Options

When comparing loan offers, don’t choose based on the monthly installment alone. A lower payment may result from a longer repayment term rather than a lower borrowing cost.

Compare the following figures for each option:

  • Monthly payment: Whether the installment fits your budget.
  • Total interest: How much you will pay to borrow the money.
  • Total repayment: The principal and interest paid across the full term.
  • Fees and annual percentage rate (APR): Additional borrowing costs that may affect the overall price.

You can adjust the loan amount, interest rate, and term in the calculator to compare different scenarios. The results can help you understand the trade-offs before reviewing the lender’s final offer.

For other financial, mathematical, health, fitness, and everyday calculation tools, CalculatorSee brings a range of online calculators together in one place.

What is Loan Calculator?

A loan calculator computes the required equal monthly installment (EMI) necessary to fully amortize an installment debt over a predetermined schedule at a fixed interest rate.

How to Use This Calculator

  1. Enter the principal amount you intend to borrow.
  2. Specify the loan term in months or years.
  3. Enter the lender’s nominal interest rate (APR).
  4. View your monthly obligation and total interest payable.

The Mathematical Formula & Variables

PMT = (P * r) / (1 - (1 + r)^(-n))

Variables Definition

Symbol / Variable Name Description
PMT Periodic Payment Monthly loan installment.
P Principal Initial loan amount.
r Periodic Rate Annual interest rate / 12.
n Periods Total number of monthly payments.

Step-by-Step Worked Example

Scenario: Borrowing $25,000 for 5 years (60 months) at 7.0% annual interest.

  1. Monthly rate r = 0.07 / 12 = 0.005833.
  2. Number of payments n = 60.
  3. Discount factor 1 - (1 + 0.005833)^(-60) = 0.31604.
  4. Monthly payment = ($25,000 * 0.005833) / 0.31604 = $461.45.
  5. Total paid = $461.45 * 60 = $27,687. Total interest = $2,687.

Result: Monthly payment is $461.45. Total financing cost is $2,687.00.

Frequently Asked Questions

Does a longer loan term reduce monthly payments?

Usually, yes. Spreading repayment across more months reduces the amount due each month, but you will generally pay more total interest if the interest rate stays the same.

Does a lower interest rate reduce the total loan cost?

Yes, for an otherwise identical fixed-rate loan, a lower interest rate generally reduces both the monthly payment and total interest paid.

Can I use a loan calculator for personal, car, and student loans?

You can use a standard loan calculator to estimate payments for many fixed-rate installment loans, including personal loans, car loans, and some student loans. However, special repayment plans, variable rates, and interest subsidies may require a different calculation method.

Are loan calculator results the same as a lender's final quote?

Not always. A calculator provides an estimate based on the values entered and its calculation method. Lender fees, payment dates, rate changes, and other contractual terms can affect the actual amount you pay.