Student Loan Repayment Calculator

How student loan repayment is calculated

Standard student-loan repayment uses the same reducing-balance amortization as most instalment loans. P is your outstanding balance, r is the monthly interest rate (annual rate ÷ 12 ÷ 100), and n is the number of monthly payments (term in years × 12). Interest is charged only on the balance that remains, so early payments are interest-heavy and later payments retire more principal — the schedule above shows the exact split each month.

Standard vs income-based and graduated plans

A standard plan fixes an equal monthly payment for the whole term — it clears the loan fastest and costs the least interest. A graduated plan starts with lower payments that rise every couple of years, useful if you expect your income to grow. An income-based plan caps the payment at a share of your income and can extend the term, lowering the monthly amount but usually increasing total interest. This calculator models the standard plan; use it as the baseline to compare the others against.

Grace period, deferment and forbearance

Many student loans include a grace period (often around six months after study) before repayment begins. Deferment and forbearance let you pause payments during hardship or further study. These pauses do not make the loan cheaper — on unsubsidised loans, interest keeps accruing and is added to your balance, so the amount you eventually repay grows. Plan for interest even when payments are paused.

Subsidised vs unsubsidised loans

On a subsidised loan, the government or lender covers the interest during study and grace periods, so your balance does not grow in that window. On an unsubsidised loan, interest accrues from day one and capitalises onto the principal. If you have both, paying the interest on unsubsidised loans early — even in small amounts — prevents it from compounding into a larger balance later.

How to pay off your student loan faster

• Pay more than the minimum: any extra goes straight to principal, cutting both the term and total interest.
• Target the highest-rate loan first (the avalanche method) to save the most money.
• Make payments during the grace period on unsubsidised loans to stop interest capitalising.
• Refinance to a lower rate if your credit has improved — but weigh the loss of any borrower protections.

Glossary

• Principal: the amount still owed.
• Capitalisation: unpaid interest being added to the principal.
• Grace period: the gap before repayment starts.
• Amortization: paying the loan off through scheduled equal payments.

Refinancing and loan consolidation

Refinancing replaces one or more existing loans with a new loan at a different rate — ideally lower — which can reduce your monthly payment or shorten the term. Consolidation merges several loans into a single one with one payment and, often, a weighted-average rate. Both can simplify life, but there is a trade-off: extending the term to lower the payment usually raises the total interest, and refinancing certain government-backed loans into a private loan can forfeit protections like income-based plans, deferment or forgiveness. Run your current loan and a refinanced version through this calculator side by side, and compare the total interest, not just the monthly figure, before deciding.

A worked payoff example

Take a ₹5,00,000 balance at 9% p.a. over 10 years. The scheduled payment is about ₹6,334 a month, and you would repay roughly ₹7.6 lakh in total. Now add just ₹1,000 extra every month: the loan clears more than a year and a half early and you save a meaningful chunk of interest, because every extra rupee attacks the principal directly and removes all the future interest that principal would have generated. This is why even small, consistent overpayments are so powerful — and why the schedule above is worth studying before you set your budget.

Fixed vs variable student-loan rates

A fixed rate keeps your payment identical for the whole term, which makes budgeting simple and protects you if market rates rise. A variable rate can start lower but moves with a benchmark, so your payment — and total cost — can climb over time. If your loan is variable, treat the figures here as a snapshot at today’s rate and rerun them whenever the rate changes.

Deferment, default and staying on track

Missing payments has consequences that escalate. A loan first becomes delinquent the day after a missed payment; if it stays unpaid it can eventually go into default, which damages your credit score and can trigger the full balance becoming due. The good news is that lenders almost always prefer to help before it gets there. If you are struggling, ask about deferment or forbearance to pause payments, or an income-based plan to lower them, well before you miss one. Setting up autopay not only prevents accidental misses but often earns a small rate discount. The single best habit is to keep every payment on time and, whenever you can, add a little extra — the schedule above shows exactly how much sooner each overpayment clears the loan.

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