By BillCut
Last updated: October 2026
How to calculate personal loan EMI comes down to three inputs: the loan amount, the yearly interest rate and the number of months. Put them into one formula and you get a fixed monthly instalment. This guide shows the formula, a worked example with round numbers and a few checks to run before you accept an offer.
What is the formula to calculate personal loan EMI?
The standard formula is:
EMI = P x r x (1 + r)^n / ((1 + r)^n – 1)
- P is the loan amount, also called the principal.
- r is the monthly interest rate. Divide the yearly rate by 12, then by 100.
- n is the number of monthly instalments.
RBI describes EMIs as equated monthly instalments that fully repay the loan, shown with an amortisation schedule over the whole tenor. The formula above is how that equal figure is worked out.
How do you work through an example?
This is an illustrative example with round numbers. It is not a BillCut offer and does not reflect any lender. Take a loan of Rs 5,00,000 at 12 percent a year for 36 months.
- Monthly rate r = 12 / 12 / 100 = 0.01.
- n = 36, so (1.01)^36 is about 1.4308.
- Top part: 5,00,000 x 0.01 x 1.4308 = about 7,154.
- Bottom part: 1.4308 – 1 = 0.4308.
- EMI = 7,154 / 0.4308 = about Rs 16,607 a month.
Over 36 months you pay about Rs 5,97,858 in total, so the interest cost is about Rs 97,858.
How does the tenure change the EMI?
A longer tenure lowers the EMI but raises the total interest. The same illustrative loan at 12 percent looks like this.
| Tenure | EMI (Rs) | Total interest (Rs) |
|---|---|---|
| 24 months | 23,537 | 64,882 |
| 36 months | 16,607 | 97,858 |
| 48 months | 13,167 | 1,32,012 |
Our post on why your personal loan tenure choice matters goes deeper into this trade off.
How much of each EMI is interest?
Early EMIs carry more interest. In the same example, month one interest is 5,00,000 x 0.01 = Rs 5,000, so about Rs 11,607 of the EMI reduces the principal. Month two interest is about Rs 4,884 and principal about Rs 11,723. By month three, interest falls to about Rs 4,767. This shrinking interest is what an amortisation schedule shows.
What can change your EMI later?
If the loan has a floating rate, the EMI or the number of instalments can change when the benchmark moves. RBI says lenders must offer the borrower a choice between a higher EMI or a longer tenure when a rate reset raises the cost, and quarterly statements must show the EMI, the remaining instalments and the rate. For a fixed rate loan, the EMI stays the same for the term.
What should you check before accepting an offer?
- Ask for the Key Facts Statement. RBI requires it for new retail term loans before the contract is signed, and it carries the annual percentage rate with all charges.
- Compare the annual percentage rate, not just the interest rate. Processing fees and other charges change the real cost.
- Run the formula yourself, then compare it with the lender’s figure.
- Check that the EMI fits your monthly budget with room to spare.
Our guide to EMI calculators in India and our note on borrowers who pick the wrong EMI tenure are useful companions.
What if you already have several EMIs?
Add up every EMI and compare the total with your monthly income. If the total feels heavy, look at our post on what to do when personal loan interest is too high. You can also Check your options with BillCut to see if one structured EMI could help.
Where can you raise a complaint about a wrong EMI?
Ask the lender first for the statement and the schedule. RBI says you can approach its Ombudsman if there is no reply within 30 days or you are dissatisfied with the reply. It is also worth taking the chance to request your free full credit report once each calendar year and check that your loan is shown correctly.
How BillCut can help
BillCut is a balance transfer and debt reduction platform. It works with lending partners to help eligible borrowers move high interest dues, such as credit card balances and personal loan EMIs, into one structured EMI. BillCut earns from helping borrowers refinance, so it has an interest in this option. Approval and terms depend on the partner lender.
Frequently asked questions
What is the formula to calculate personal loan EMI?
EMI = P x r x (1 + r)^n / ((1 + r)^n – 1), where P is the principal, r is the monthly rate and n is the number of months.
How do I get the monthly interest rate?
Divide the yearly rate by 12 and then by 100. For 12 percent a year, the monthly rate is 0.01.
Does a longer tenure reduce the EMI?
Yes, but you pay more total interest. In the illustrative example, 48 months gives a lower EMI than 24 months and higher total interest.
Why is so much of my early EMI interest?
Interest is charged on the outstanding balance, which is highest at the start. As the balance falls, more of each EMI goes to the principal.
Can my EMI change after the loan starts?
On a floating rate loan, a rate reset can change the EMI or the tenure. RBI says lenders must offer borrowers a choice.
What should I ask the lender to show me?
Ask for the Key Facts Statement. For new retail term loans, RBI requires it before signing, with the annual percentage rate and a repayment schedule.
Can BillCut help with several EMIs?
BillCut is a balance transfer and debt reduction platform. Eligible borrowers may move dues into one EMI. Approval depends on the partner lender.
Disclaimer: This article is general information, not financial advice. The examples are illustrative and use made up numbers. Your lender sets the actual EMI and terms.
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