EMI Calculator Widget

Add a free, responsive EMI calculator to your website. Readers enter the loan amount, interest rate and tenure and instantly see the monthly instalment, the total interest and the principal-to-interest split, with a full amortisation schedule.

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<iframe src="https://a2z.tools/embed/w/emi-calculator" title="EMI Calculator by A2Z Tools" width="100%" height="560" style="border:0;width:100%" loading="lazy" allow="clipboard-write"></iframe>

A plain iframe. Works everywhere, including site builders that strip scripts. Adjust height if your content needs more room.

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How it works

The widget uses the same reducing-balance EMI engine as the A2Z Loan EMI Calculator. The annual rate is turned into a monthly rate by dividing by 12, the tenure into a count of monthly instalments, and the equated instalment is the level payment that brings the balance to exactly zero after the last one. Each month's interest is charged on the outstanding balance only, so in a 20-year home loan at 8.5% the first year's instalments are about 81% interest and the last year's under 5%. The year-by-year table under the result adds up the principal and interest paid in each year of the loan and the balance left at its end. A 0% loan is handled as principal divided by the number of months, and tenures are limited to 1-600 months so the maths stays meaningful.

Calculation method

  • EMI = P x r x (1 + r)^n / ((1 + r)^n - 1)
  • P = loan amount, r = annual rate / 12 / 100 (monthly rate), n = tenure in months (years x 12, rounded to a whole month)
  • Total repayment = EMI x n; total interest = total repayment - P
  • At 0% interest, EMI = P / n
  • Rounding: the EMI and totals are calculated unrounded and displayed to 2 decimals; the yearly schedule is displayed in whole currency units

Worked examples

Home loan of 25 lakh

Inputs: Amount 25,00,000; rate 8.5% a year; tenure 20 years (240 months)

Result: EMI 21,695.58; total interest 27,06,939.40; total repayment 52,06,939.40

Interest paid over the life of the loan is larger than the amount borrowed; in year 1 only 49,756 of the 2,60,347 paid reduces the principal.

Car loan of 10 lakh over 60 months

Inputs: Amount 10,00,000; rate 9%; tenure 60 months

Result: EMI 20,758.36; total interest 2,45,501.31; total repayment 12,45,501.31

A short tenure keeps interest to about a quarter of the principal.

Personal loan of 5 lakh

Inputs: Amount 5,00,000; rate 10.5%; tenure 5 years

Result: EMI 10,746.95; total interest 1,44,817.01

Doubling the rate from the car-loan level adds far less than doubling the EMI, because the principal part is unchanged.

Limitations

  • Assumes one fixed rate for the whole tenure; a floating-rate loan that resets will not follow this schedule after the reset.
  • Ignores processing fees, GST on fees, insurance premiums added to the loan and broken-period (pre-EMI) interest, so it is not an APR.
  • Instalments are monthly; loans repaid weekly or quarterly need a different calculation (see the Loan Calculator).
  • Part-prepayments, foreclosure and moratorium or EMI-holiday periods (when unpaid interest is capitalised) are not modelled; re-run it with the new balance instead.
  • Step-up, step-down and balloon repayment structures offered on some home loans need a different schedule.
  • Income-tax deductions on home-loan interest or principal are not applied; the figures are gross, before any tax benefit.

Where publishers use it

  • Home-loan, car-loan and personal-loan articles on a bank, NBFC or finance blog
  • A loan agent's or DSA's website, so visitors can check affordability before calling
  • Real-estate listings that show the instalment next to the property price
  • Personal-finance courses explaining how interest front-loads a loan
  • Two-wheeler and consumer-durable dealers showing a zero-down EMI next to the sticker price
  • Education-loan guides where repayment begins once the course and grace period end
  • Gold-loan, loan-against-property and top-up loan explainers on lender sites

Questions

Is the EMI shown exact?

It is the standard reducing-balance EMI: 25 lakh at 8.5% for 20 years is 21,695.58 a month. A sanction letter can differ by a few rupees because lenders round the instalment up to the rupee, charge broken-period interest from disbursal to the first EMI date, or add insurance and processing fees to the loan.

Why is so much of the early EMI interest?

Interest is charged on the balance still owed. On 25 lakh at 8.5% the first month's interest is 17,708.33 of the 21,695.58 EMI; only 3,987.25 reduces the loan. As the balance falls the split reverses.

What happens to my EMI when a floating rate changes?

Lenders either keep the EMI and change the number of instalments or keep the tenure and change the EMI. Re-run the widget with the new rate and the remaining balance and tenure to see both options.

Can I set the currency and default loan values?

Yes. Pick the currency in the builder and preset the amount, rate and tenure; the embed code carries them as URL parameters such as currency=INR&v_amount=2500000.

Does it handle tenure in months?

Yes. Switch 'Tenure in' to Months for short personal or consumer loans, for example 18 or 36 months.

How does a flat-rate quote compare?

A flat rate charges interest on the original principal for the whole tenure. 1,00,000 at 10% flat for 3 years means 30,000 interest and an EMI of 3,611.11 - the same EMI as a reducing-balance loan at about 17.92%. This widget works on reducing balance only, so convert a flat quote before comparing.

Should a prepayment cut the EMI or the tenure?

On 25 lakh at 8.5% for 20 years, the balance after 60 EMIs is about 22,03,180. Prepaying 5 lakh and keeping the EMI clears the loan in 116 more months with about 7.93 lakh further interest; keeping the tenure lowers the EMI to 16,771.88 but leaves about 13.16 lakh of interest. Shortening the tenure saves more, lowering the EMI eases the monthly budget.

How do I check what a repo-linked rate cut does to my EMI?

Enter the outstanding principal from your latest statement, the new rate and the months left. With 20 lakh outstanding and 180 months to go, a cut from 9% to 8.5% lowers the EMI from 20,285.33 to 19,694.79 and the remaining interest by about 1.06 lakh.

What is pre-EMI interest on an under-construction home?

When a loan is disbursed in tranches as construction progresses, many borrowers pay only interest on the amount released until the full disbursal; the full EMI starts afterwards. The widget models the full EMI from the first month, so run it on the final sanctioned amount.

Sources

  1. EMI Calculator (and its script assets/calc/emi.js, dcutils.js mortgagePayment) - SEBI Investor website, Securities and Exchange Board of India . Regulator-published calculator using the same convention: monthly rate = annual rate / 12, n = years x 12, level payment P(1 + r)^n r / ((1 + r)^n - 1). Checked 2026-10-01.
  2. What is amortization and how could it affect my loan? - Consumer Financial Protection Bureau (US) . Explains why early payments are mostly interest on a reducing balance.
  3. Key Facts Statement (KFS) for Loans & Advances, RBI/2024-25/18, 15 April 2024 - Reserve Bank of India . Why a lender's sanction figures include charges and an APR this widget does not model. The RBI site served an access-check page to our automated fetch on 2026-10-01; URL taken from RBI's document server listing.

Cite or recommend this tool

If you reference this tool in an article, course or documentation, these formats are ready to copy. They are optional - nothing is added to your site unless you paste it.

A2Z Tools EMI Calculator
https://a2z.tools/loan-emi-calculator

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