Loan Calculator

A Loan Calculator works out the fixed monthly payment on a loan from three inputs: the amount you borrow, the annual interest rate, and how long you take to repay it. It uses the standard amortization formula to show your monthly payment (often called the EMI, or equated monthly instalment), the total interest you will pay over the life of the loan, and the total amount you repay in the end. You can also open a month-by-month schedule that breaks every payment into principal and interest and shows the shrinking balance.

Everything runs locally in your browser with JavaScript, so the numbers update the moment you type and nothing you enter is ever sent to a server. There is no sign-up and no data is stored. Treat the results as a planning estimate rather than a formal lender quote or financial advice.

How to use the loan calculator

1. Enter the loan amount (the principal you plan to borrow).
2. Type the annual interest rate as a percentage, for example 6.5 for 6.5%.
3. Set the term and choose whether it is measured in years or months.
4. Optionally pick a currency so amounts format with the right symbol, or leave it neutral.
5. Read the summary — monthly payment, total interest, and total repaid — then toggle the amortization schedule to see each payment split into principal and interest.

What is the amortization formula?

The monthly payment on a fixed-rate loan comes from M = P · r · (1 + r)ⁿ / ((1 + r)ⁿ − 1), where P is the principal, r is the monthly interest rate (the annual rate divided by 12 and by 100), and n is the number of monthly payments. Early in the loan most of each payment is interest; as the balance falls, more of every payment goes to principal. That shift is exactly what the amortization schedule visualises.

How is a 0% interest loan handled?

When the interest rate is zero, the amortization formula divides by zero, so the calculator switches to a simpler rule: the monthly payment is just the loan amount divided by the number of months. Total interest is zero and total repaid equals the amount borrowed. This makes interest-free promotional financing easy to check without any special setup.

Loan calculator features

• Instant monthly payment (EMI) from amount, rate, and term, recalculated live as you type.
• Total interest and total repaid so you can see the true cost of borrowing, not just the monthly figure.
• Full amortization schedule you can toggle on, with per-month principal, interest, and remaining balance.
• Years or months term input, plus optional currency formatting powered by Intl.NumberFormat.
• 0% interest handled gracefully and honest final-payment rounding so the balance ends exactly at zero.
• Copy summary and CSV export of the schedule, all generated entirely in your browser.

When to use it, and its limits

This tool is ideal for comparing scenarios: shorten the term to see how much interest you save, or nudge the rate to gauge the impact of a better offer. It is deliberately simple, so it does not model fees, insurance, taxes, extra repayments, or variable rates — real lender statements can therefore differ by small amounts. To reason about the cost as a share of your income, pair it with a Percentage Calculator and express the monthly payment as a percent of your take-home pay.

Working with dates and other figures

Loan planning often touches dates and unrelated numbers. If you want to know how many months sit between your first and final payment, a Date Difference Calculator gives an exact span you can feed back in as the term. When a loan is tied to a life milestone — say a mortgage you want paid off by a certain birthday — an Age Calculator helps you line the timelines up. And if a lender quotes figures in a different measurement system or you are converting a foreign price before borrowing, a Unit Converter keeps the inputs consistent before you run the numbers here.

Frequently Asked Questions

How is the monthly loan payment calculated?

It uses the standard amortization formula: the payment equals the principal times the monthly rate times (1 + monthly rate) to the power of the number of payments, divided by that same power minus one. The monthly rate is the annual rate divided by 12 and by 100. The result is a fixed payment that fully clears the loan by the final month.

What is EMI?

EMI stands for equated monthly instalment — the fixed amount you pay each month on an amortizing loan. It covers both interest and principal, and while the total stays constant, the interest portion shrinks and the principal portion grows over time.

Does the calculator handle 0% interest loans?

Yes. At a zero interest rate the payment is simply the loan amount divided by the number of months, total interest is zero, and total repaid equals the amount borrowed. No special input is needed.

What is an amortization schedule?

It is a month-by-month table showing how each payment is split between interest and principal and how the remaining balance falls to zero. You can toggle it on below the summary and download it as a CSV file.

Why might my lender's numbers differ slightly?

This tool estimates the pure principal-and-interest payment and excludes fees, insurance, taxes, and variable-rate changes. Lenders may also round differently or compound on a different schedule, so treat the figures as a close estimate, not a formal quote.

Is my financial data sent anywhere?

No. Every calculation happens locally in your browser with JavaScript. Nothing you type is uploaded, logged, or stored, and the tool keeps working offline once the page has loaded.