Loan & EMI Calculator

What an EMI is, and what it hides

An EMI — equated monthly instalment — is a fixed amount you pay every month until the loan is gone. The amount never changes, which is what makes it easy to budget for. What changes, quietly, is what the payment is doing.

Every month the lender charges interest on what you still owe. Whatever is left of your instalment after that goes to reducing the balance. On a 500,000 loan at 12%, the first month’s interest is 500,000 × 12% ÷ 12 = 5,000. The instalment is 11,122.22, so 6,122.22 comes off the balance. Next month there is slightly less to charge interest on, so slightly more of your payment reduces the debt — and so on, accelerating, until the final instalment is almost entirely principal.

This is why paying off a loan early saves less than people expect in the last year, and far more than people expect in the first.

The formula

EMI = P × i × (1 + i)ⁿ ÷ ((1 + i)ⁿ − 1)

Symbol	Meaning
P	The amount borrowed
i	The monthly interest rate: annual rate ÷ 100 ÷ 12
n	The number of monthly instalments

A worked example

500,000 borrowed at 12% a year, over 60 months.

1. Monthly rate. 12 ÷ 100 ÷ 12 = 0.01
2. Growth factor. (1.01)⁶⁰ = 1.816697
3. Numerator. 500,000 × 0.01 × 1.816697 = 9,083.48
4. Denominator. 1.816697 − 1 = 0.816697
5. EMI. 9,083.48 ÷ 0.816697 = 11,122.22 a month

Across 60 instalments you repay 667,333.51, of which 167,333.51 is interest — a third as much again as you borrowed.

How the term changes the cost

Term	Monthly instalment	Total interest	Total repaid
12 months	44,424.39	33,092.76	533,092.76
24 months	23,536.74	64,881.68	564,881.68
36 months	16,607.15	97,857.63	597,857.63
48 months	13,166.92	132,012.04	632,012.04
60 months	11,122.22	167,333.51	667,333.51

500,000 at 12%, calculated with the tool on this page.

Stretching the same loan from one year to five cuts the monthly payment by 75% and multiplies the interest by five. Neither column is the “right” answer — the right term is the shortest one whose instalment you can pay every month without strain, because a missed payment costs more than the interest ever would.

Flat rate versus reducing balance — read this before you sign

This is where borrowers in South Asia and the Gulf lose the most money, and it is almost always legal, disclosed and misunderstood.

A reducing balance rate — what this calculator uses, and what a mortgage uses — charges interest only on what you still owe. A flat rate charges interest on the original amount for the whole term, even though you have been paying it down all along.

On 500,000 over 5 years:

	Flat 12%	Reducing 12%
Total interest	300,000.00	167,333.51
Monthly instalment	13,333.33	11,122.22

Same advertised number. 132,666 more paid.

A flat 12% is roughly equivalent to a reducing rate of 20.3%. So when a lender quotes a flat rate, the honest comparison is to nearly double it. Always ask which basis a quote uses, and if the answer is flat, ask for the reducing equivalent — reputable lenders will tell you.

What the processing fee really costs

Most lenders take a one-off fee, typically 1%–2%, out of the money they release. Borrow 500,000 with a 2% fee and 490,000 arrives in your account — but the instalments are calculated on the full 500,000.

So you are paying interest on 10,000 you never received, plus losing the 10,000 itself. The calculator above shows the amount that actually reaches you, and the total cost once the fee is included, because the advertised rate never does.

Before you borrow

• Compare the total repaid, not the instalment. Lenders compete on the monthly figure because a longer term always makes it look smaller.
• Ask whether early repayment is allowed, and what it costs. Some lenders charge a penalty that cancels out the interest you would save.
• Check what else is bundled in. Credit insurance, documentation charges and late-payment terms are often added to the instalment after the quote.
• Only borrow what the instalment can survive. A common guideline is to keep all loan payments together under 36% of income — including a mortgage.