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Credit Card Interest/EMI Calculator
See the true interest cost of revolving credit card debt or converting a bill to EMI. Adjust any input below and your results update instantly.
Understanding credit card interest
The concept, the motivation, and what to watch out for.
The minimum due is designed to feel affordable — that's exactly the problem
Paying only your card's minimum due keeps you technically 'current,' but the rest of the balance keeps accruing interest at the card's full monthly rate — often 3-3.5% a month, or 40%+ annualized. Because the minimum is a percentage of a balance that itself grows every month, payoff can stretch for years and cost far more in interest than the original purchase.
Most issuers offer a way out: converting the balance into fixed-tenure EMIs at a much lower rate. This calculator lines up both paths side by side, so the real cost of "just paying the minimum" is impossible to miss.
The minimum due is a moving target
It's a percentage of next month's statement balance, which already includes this month's interest — so the amount you owe can grow even as you keep paying on time.
EMI conversion is a genuinely different loan
It fixes your rate, tenure, and payment upfront — nothing like the open-ended, compounding nature of a revolving balance.
How this calculator helps
Enter your balance and rates — see how long the minimum-due path actually takes, and how much converting to EMI could save.
Calculate your credit card cost
Fill in the starred fields on the left — your results update instantly on the right.
Your details
e.g. ₹50,000
e.g. 3.5%/month
e.g. 5%
e.g. 15% p.a.
e.g. 12 months
e.g. 1%
These are example numbers. Edit any input on the left to see your own.
Interest if you only pay the minimum
₹1.04 L
Never fully pays off
Total paid
₹1.54 L
EMI conversion cost
₹4,655
Converting to EMI at 15% p.a. costs ₹4,655 total — versus ₹1.04 L left revolving at 3.5%/month.
Balance vs. cumulative interest, paying only the minimum
BalanceCumulative interest
Month-by-month, paying only the minimum
Shown up to month 120 — at this rate, the balance won't clear within 30 years (it may even grow, depending on your inputs).
MonthBalanceInterest paidStatus
1₹49,163₹1,750
2% repaid
2% repaid
18₹36,891₹27,392
26% repaid
26% repaid
35₹27,683₹46,633
45% repaid
45% repaid
52₹20,773₹61,072
58% repaid
58% repaid
69₹15,588₹71,906
69% repaid
69% repaid
86₹11,697₹80,036
77% repaid
77% repaid
103₹8,777₹86,137
82% repaid
82% repaid
120₹6,586₹90,715
87% repaid
87% repaid
Compare scenarios
See how EMI conversion or a larger monthly payment changes your total interest.
Pay only the minimum
Never pays off
₹1.04 L
Total interest
Baseline
Convert to EMI instead
12 months, fixed
₹4,655
Total interest
-₹99,584
Pay 10.0% minimum instead
153 months
₹25,547
Total interest
-₹78,692
Worked example, using your numbers
A step-by-step walkthrough of what paying only the minimum actually costs.
Step 1 · This month's interest
On ₹50,000 at 3.5%/month, interest alone comes to
₹1,750
Step 2 · Total interest, minimum only
This balance never fully pays off — interest keeps accruing
₹1.04 L
Step 3 · EMI conversion cost
Converting instead, over 12 months, total cost is
₹4,655
✓
Converting to EMI instead of paying only the minimum could save ₹99,584 in total interest.
Personalised insights
What your numbers reveal, and what changing them would do.
At 5% minimum due, this balance won't clear within 30 years
Your 5% minimum due is too close to the 3.5% monthly interest rate — each payment barely outpaces that month's interest, so the balance shrinks by only a sliver (or doesn't shrink at all) no matter how many payments you make on time.
Converting to EMI would save you ₹99,584
At 15% p.a. over 12 months, EMI conversion costs ₹4,655 total (including the ₹500 processing fee) — versus ₹1.04 L left revolving.
Doubling your minimum-due percentage to 10.0% changes everything
It pays off in 153 months instead of never, costing ₹25,547 in interest — ₹78,692 less.
Your EMI would be ₹4,513/month
A fixed, predictable payment for 12 months — compare that against what you're actually paying now under the minimum-due schedule.
How this is calculated
Every step of the math behind your result, shown in the open.
Each month's minimum due
r = monthly interest rate, d = minimum due as a fraction of the statement balance, Payment = what you actually pay that month
The minimum due is calculated on next month's statement balance — which already includes this month's interest — not on today's balance.
Example: ₹50,000 × (1 + 3.5%) × 5% → month 1 payment
Why the balance can refuse to shrink
r = monthly interest rate, d = minimum due fraction, Balance = what's left after this month's payment
If the minimum due percentage isn't comfortably above the monthly interest rate, this condition fails and the balance grows every month instead of shrinking.
Example: (1 + 3.5%) × (1 − 5%) ≥ 1 → balance never shrinks
EMI conversion, the standard annuity formula
P = the balance being converted, r_m = the EMI's monthly rate, n = tenure in months, EMI = your fixed monthly payment
The same formula behind every amortizing loan — a fixed payment that steadily pays down both principal and interest.
Example: ₹50,000 over 12 months at 15% → ₹4,513/month
Assumptions
- This models a single existing balance with no new spending — real cards also lose their interest-free grace period on new purchases the moment any balance revolves, which isn't modeled here.
- The minimum-due formula used here is the common flat-percentage convention — several issuers (SBI among them) use a more granular formula that carves out fees, GST, and EMI instalments separately.
- The revolving-payoff simulation is capped at 30 years — if the balance still hasn't cleared by then, it's treated as never paying off.
- Figures are indicative — not financial advice.
Did you know?
A few facts behind how credit card interest actually works.
40%+
Credit card interest rivals the most expensive loans in India
At 3.5% a month, a credit card's annualized rate exceeds 40% — several times higher than even the priciest personal loans.
5%
The minimum due is usually just one-twentieth of what you owe
A 5% minimum due means paying off a balance this way — assuming it clears at all — routes the vast majority of every payment toward interest, not principal, especially early on.
0 days
The grace period disappears the moment you revolve
Carry any balance past the due date, and new purchases lose their interest-free window too — interest starts from the transaction date, not the due date.
Never
Some minimum-due percentages mathematically never pay off
If the minimum due percentage doesn't exceed the monthly interest rate by a comfortable margin, the balance can grow indefinitely rather than shrink — no matter how many payments you make on time.
12-24%
EMI conversion is a real escape hatch, not a marketing gimmick
Converting a revolving balance to EMI typically cuts the effective rate by more than half compared to letting it continue accruing at the card's full monthly rate.
Frequently asked questions
Straight answers to the questions we hear most about credit card interest.
Why does paying the minimum due sometimes not reduce my balance at all?
Because the minimum due is a percentage of next month's statement balance — which already includes this month's interest charge. If that percentage doesn't comfortably exceed your monthly interest rate, your payment barely covers the new interest, and the principal itself never actually shrinks.
Is credit card interest really charged per month, not per year?
Yes — Indian credit cards typically quote rates of 1.99% to 3.6% PER MONTH. Annualized, the higher end of that range works out to over 40% a year, far more expensive than almost any other form of consumer borrowing.
Do I still get an interest-free period if I pay the minimum due?
No — the interest-free grace period only applies if you pay your ENTIRE statement balance by the due date. The moment any balance revolves, you lose that grace period on new purchases too, and interest starts accruing from each transaction's date, not just the due date.
Why would converting to EMI ever be better than just paying it off faster?
If you genuinely can't pay off the balance quickly, EMI conversion locks in a much lower fixed rate (typically 12-24% p.a.) instead of leaving it to revolve at the card's full rate (often 40%+ annualized) — the interest saved usually far outweighs the one-time processing fee.
Does this calculator account for new purchases on the card?
No — this models paying down a single existing balance with no new spending. Any new purchases made while a balance is revolving lose their own grace period and start accruing interest immediately, making the real-world cost higher than this projection if you keep using the card.
What's the single best way to avoid all of this?
Pay your full statement balance every month, by the due date. That's the only way to keep the interest-free grace period intact — once any part of a bill revolves, the discussion becomes about which of the expensive options (continuing to revolve, or converting to EMI) costs less, not about avoiding interest altogether.
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Learn more
Articles to go deeper on the ideas behind this calculator.
Fundamentals
The credit card minimum payment trap, explained
Why paying only the minimum can take years and cost more than the purchase itself.
5 min read
Fundamentals
How credit card interest-free periods actually work
Grace periods, statement dates, and what makes them disappear.
4 min read
Strategy
When EMI conversion actually makes sense
Comparing the processing fee against the interest you'd save.
5 min read