DDanfio

Loan Calculator

This calculator answers the two questions that matter for any fixed-rate loan: what will I pay each month, and what does the loan really cost once interest is added? It covers personal loans, student loans, car loans without trade-ins, business term loans and private lending.

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Results update as you type. Nothing leaves your device.

Monthly payment

$506.91

60 payments of $506.91 on $25,000 at 8%.

Amount borrowed
$25,000
Total interest
$5,414.59
Total repaid
$30,414.59
Payoff month
Aug 2031

Cost breakdown

First payment interest
$166.67
Interest as % of repayments
17.8%
Number of payments
60
Interest per $100 borrowed
$21.66

Amortization schedule

YearPaymentsInterestPrincipalBalance
Year 1$6,083$1,847$4,236$20,764
Year 2$6,083$1,495$4,588$16,176
Year 3$6,083$1,115$4,968$11,208
Year 4$6,083$702$5,381$5,827
Year 5$6,083$256$5,827$0

The monthly view lists the first 36 payments; the CSV export contains all 60.

Enter an amount, a rate and a term, and the schedule appears immediately — including a downloadable CSV you can open in a spreadsheet or send to an accountant. Nothing is uploaded, so you can test the numbers in a real offer before you sign anything.

How this loan calculator works

The payment formula

Monthly payment = P × i / (1 − (1 + i)^−n), where P is the amount borrowed, i is the monthly interest rate and n is the number of months in the term.

Total interest is the monthly payment multiplied by the number of payments, minus the amount borrowed. That single figure is where short and long terms differ most.

Why the term matters more than the rate

Stretching a loan over more months lowers the payment but raises the total interest, because the balance stays outstanding for longer. On a $25,000 loan at 8%, a 5-year term costs roughly $5,400 in interest while a 7-year term costs around $7,700.

The rate still matters, so if you are comparing offers, compare the APR rather than the headline rate: fees change the effective cost and the APR calculator shows that difference.

What this tool does not include

There are no origination fees, late charges or insurance products in the model, and the rate is treated as fixed for the whole term. Variable-rate loans need a payment for each rate scenario instead.

Payments are monthly and interest is charged monthly on the outstanding balance, which matches how most consumer loans are documented in the United States, Canada, the UK and Australia.

Worked examples

Each example below was run through the calculator on this page when the site was built, so the numbers match what you see when you enter the same inputs.

Five-year personal loan

Loan amount
$25,000.00
Interest rate
8%
Term
5 years
First payment month
Sep 2026

Monthly payment

$506.91

60 payments of $506.91 on $25,000 at 8%.

Amount borrowed
$25,000
Total interest
$5,414.59
Total repaid
$30,414.59
Payoff month
Aug 2031

A shorter term keeps total interest near 20% of the amount borrowed.

Ten-year home improvement loan

Loan amount
$60,000.00
Interest rate
7.25%
Term
10 years
First payment month
Sep 2026

Monthly payment

$704.41

120 payments of $704.41 on $60,000 at 7.25%.

Amount borrowed
$60,000
Total interest
$24,528.75
Total repaid
$84,528.75
Payoff month
Aug 2036

Doubling the term lowers the payment by about 40% but roughly doubles the interest.

Small short-term loan

Loan amount
$5,000.00
Interest rate
12%
Term
2 years
First payment month
Sep 2026

Monthly payment

$235.37

24 payments of $235.37 on $5,000 at 12%.

Amount borrowed
$5,000
Total interest
$648.82
Total repaid
$5,648.82
Payoff month
Aug 2028

High rates hurt most when the loan is short: interest is still several hundred dollars.

Frequently asked questions

Is the monthly payment the same for the whole term?

For a fixed-rate, fully amortizing loan, yes. Each payment is identical, but the split between interest and principal shifts every month: early payments are mostly interest, later payments are mostly principal.

What is the difference between interest rate and APR?

The interest rate prices the money you borrow. The APR also folds in upfront fees such as an origination fee or discount points, so it is the better number for comparing two offers. Use the APR calculator when a lender quotes you both.

How much can the total interest change with the term?

A lot. Because interest is charged on the outstanding balance, extending the term keeps the balance alive longer. On the same $25,000 loan at 8%, moving from 5 years to 7 years adds roughly $2,300 of interest in exchange for a lower monthly payment.

What happens if I pay the loan off early?

Most simple-interest personal loans allow early repayment, and you save the interest that would have been charged on the remaining balance. Check for a prepayment penalty, which some lenders charge as a flat fee or a percentage of the remaining balance.

Should I choose the lowest payment or the shortest term?

Choose the shortest term whose payment you can still make comfortably in a bad month, then keep an emergency fund. A loan that strains the budget tends to become a longer, more expensive loan later.

Can I use this for a mortgage or a car loan?

Yes, but the dedicated tools model those products better: the mortgage calculator adds property tax, insurance and mortgage insurance, and the auto loan calculator handles trade-in value, sales tax and dealer fees.

Assumptions and sources

  • Payment formula: standard annuity formula for fully amortizing fixed-rate loans.
  • Payment frequency is monthly with interest compounded monthly, matching standard US consumer loan disclosures.

Last reviewed 2026-09-13. This page is an estimate tool, not financial, tax or legal advice.Read the full disclaimer.