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Credit Card EMI Calculator
Use this credit card EMI calculator to work out the fixed monthly installment for any card purchase before you convert it to EMI. Enter the purchase amount, the annual interest rate, and the tenure in months — the calculator shows your monthly EMI, the total amount you will pay, the total interest, and a full month-by-month schedule showing how each payment splits between interest and principal.
Pick a preset tenure or choose Custom and type any tenure from 1 to 60 months. The EMI is the same every month for the whole tenure.
Interest vs principal over time
Cumulative principal paid (dark blue) rises faster than cumulative interest (light blue) as the balance falls.
How it works
When you convert a card purchase to EMI, the issuer does not simply divide the amount by the number of months. Interest is charged on the balance that is still unpaid, and that balance shrinks a little with every payment. The EMI formula accounts for that shrinking balance and produces one fixed monthly payment that pays off the purchase, including all interest, exactly by the end of the tenure.
Monthly rate is the first step. Card interest is quoted as an annual rate, the APR, but it is charged monthly, so the formula divides it by 12 and by 100. An 18% APR becomes a monthly rate of 1.5%, or 0.015. That monthly rate is applied to the remaining balance each month, which is why the interest part of the first payment is the largest and the interest part of the last payment is the smallest.
The EMI formula uses the purchase amount P, the monthly rate r, and the tenure n in months. The term (1 + r)n grows with both the rate and the tenure, and the formula balances it so the fixed payment exactly clears the debt. If the APR is 0%, there is no interest to pay and the formula is not needed — the EMI is simply the purchase amount divided by the number of months, and this calculator handles that case directly.
Interest and principal split is what the schedule shows. Each month, the interest part equals the remaining balance times the monthly rate, and the principal part is whatever is left of the EMI after that interest is taken. Early on, most of the payment is interest because the balance is large. As the balance falls, the interest part shrinks and more of each payment goes to principal. By the final month, almost the whole payment is principal. The chart beside the calculator draws this as two rising lines: cumulative principal paid and cumulative interest paid. The principal line climbs steeply, while the interest line flattens out as the balance drops.
Tenure is the trade-off you control. A shorter tenure means a larger monthly EMI but less total interest, because the balance is outstanding for fewer months. A longer tenure means a smaller monthly payment that is easier to fit into a budget, but you pay interest for longer, so the total cost rises. Try both: set the same purchase and APR, switch the tenure from 12 to 24 months, and watch the total interest roughly double while the EMI falls by nearly half.
Worked example
A buyer converts a $1,200 purchase to EMI at 18% APR over 12 months.
Step 1: Monthly rate. r = 18 ÷ 12 ÷ 100 = 0.015, or 1.5% per month.
Step 2: Growth factor. (1 + 0.015)12 = 1.01512 = 1.195618.
Step 3: Monthly EMI. EMI = 1,200 × 0.015 × 1.195618 ÷ (1.195618 − 1) = 21.521127 ÷ 0.195618 = $110.02 (unrounded $110.0157).
Step 4: Total payable. $110.0157 × 12 = $1,320.19.
Step 5: Total interest. $1,320.19 − $1,200.00 = $120.19.
The first month's payment of $110.02 splits into $18.00 of interest ($1,200.00 × 1.5%) and $92.02 of principal, leaving a balance of $1,107.98. By the final month, the interest part has fallen to $1.63 and the principal part has risen to $108.39, clearing the balance to $0.00. Try it yourself: enter purchase amount 1200, APR 18, and tenure 12 months, then press Calculate. The tool gives exactly the same answer — monthly EMI $110.02, total payable $1,320.19, total interest $120.19.
FAQ
What is a credit card EMI?
A credit card EMI, or equated monthly installment, is a fixed monthly payment that spreads the cost of a purchase over several months instead of paying it all at once. When you convert a purchase to EMI, the card issuer divides the amount into equal monthly installments that cover part of the purchase price plus interest. You pay the same amount every month until the purchase is fully paid off, which makes budgeting easy because the payment never changes during the tenure.
How is a credit card EMI calculated?
The EMI is calculated with the standard loan formula: EMI = P × r × (1 + r)^n / ((1 + r)^n − 1), where P is the purchase amount, r is the monthly interest rate (annual interest rate divided by 12 and by 100), and n is the tenure in months. The monthly rate matters because card interest is charged monthly, not yearly. This calculator applies that formula and also builds the full month-by-month schedule, so you can see how much of each payment goes to interest and how much reduces the balance.
Does a longer tenure mean more interest?
Yes. A longer tenure lowers your monthly EMI because the same amount is spread over more payments, but you pay interest for more months, so the total interest and the total payable both rise. For example, a $1,200 purchase at 18% APR costs about $120.19 in interest over 12 months, but stretching the same purchase over 24 months roughly doubles the total interest even though each monthly payment is smaller. If you can afford the shorter tenure, it is usually the cheaper choice overall.
Is there a fee for converting a purchase to EMI?
Many card issuers charge a one-time processing fee for converting a purchase to EMI, often a flat amount or a small percentage of the purchase, and some also charge a fee if you cancel the EMI plan early. A few issuers offer no-cost EMI on selected purchases, where the interest is discounted by the seller, but the processing fee may still apply. This calculator does not add a processing fee, so add any fee your issuer charges to the purchase amount if you want it included in the result, and check your issuer's terms before converting.
What happens if I miss an EMI payment?
Missing an EMI payment usually means a late payment fee, interest charged on the unpaid amount at the card's normal interest rate, and a mark on your credit record if the payment stays overdue. The unpaid EMI is normally added to your next statement, and repeated missed payments can lead to the EMI plan being cancelled, with the full remaining balance becoming due at once. If you think you will miss a payment, contact your card issuer before the due date — they may offer a short grace period or a revised plan.