Loan Repayment Calculator
Estimate installments, interest costs, and payoff time for common loans in Singapore.
Use the total amount borrowed before interest is added.
Enter the nominal yearly rate quoted by your lender.
Choose the planned duration of the loan.
Pick how often you expect to make repayments.
Add extra repayments to see how much faster you can clear the balance.
Repayment Summary
What this summary shows
The calculator uses a standard amortizing loan formula. It assumes a fixed interest rate throughout the full term and applies every extra payment directly to principal once the interest for that period has been covered.
Year-by-Year Amortization Schedule
Review how each year of repayments is split between principal and interest.
| Year | Payments | Total Paid | Principal | Interest | Ending Balance |
|---|
About This Loan Repayment Calculator
This Loan Repayment Calculator helps you estimate how much a loan will really cost over time. Whether you are planning for a personal loan, car loan, renovation financing, education loan, or mortgage, the tool gives you a fast way to check the repayment amount, total interest, and total cash outflow before you commit.
Many borrowers compare interest rates but overlook the impact of repayment term and payment frequency. A lower monthly installment can look attractive at first, yet stretching the loan for more years often means paying much more interest overall. This calculator makes that trade-off visible immediately.
It is also useful for testing faster repayment strategies. By entering an extra payment amount, you can see how much interest you may save and how much sooner the balance could be cleared. That makes it easier to plan disciplined prepayments without waiting for a bank statement or spreadsheet.
All calculations run in your browser, so you can explore different scenarios privately. Use the results as a planning guide, then confirm the exact offer, fees, and insurance requirements with your lender before signing any loan agreement.
How to Use It
- Enter the loan amount: Use the original principal you want to borrow, not the total amount after interest.
- Add the annual interest rate: Enter the quoted yearly rate from your lender. If the loan has a promotional rate that later changes, test more than one scenario.
- Set the repayment term: Choose how many years you expect the loan to run. A longer term usually lowers each installment but increases total interest.
- Select the payment frequency: Monthly is common for many consumer and housing loans, while some products may use biweekly or weekly repayments.
- Optional extra payment: Add any amount you plan to pay on top of the scheduled installment. The calculator will show the impact on total interest and payoff time.
- Review the summary and schedule: Check the repayment summary first, then scan the amortization table to see how the interest share declines as the balance falls.
Key Terms and Concepts
Principal is the original amount borrowed. Interest is charged on the remaining principal balance, which is why early payments in a long loan usually contain more interest than later payments.
Amortization means paying a loan down gradually through scheduled installments. Each payment usually covers interest first, with the remainder reducing principal.
Interest rate is the annual percentage charged by the lender. A fixed rate stays constant for the calculation, while a floating rate can change over time and should be tested using multiple assumptions.
Repayment term is the planned duration of the loan. Shorter terms usually mean higher installments but lower total interest.
Extra payment is any amount paid above the required installment. On most amortizing loans, extra payments reduce principal faster and cut future interest, although some lenders may impose conditions or penalties.
Common Use Cases
- Comparing personal loan offers with different terms and rates.
- Checking whether a car loan payment fits comfortably within your monthly budget.
- Estimating the long-term cost of a mortgage before speaking to a broker.
- Testing whether making a fixed extra repayment each month could shorten the loan materially.
- Planning debt consolidation scenarios and seeing if a new loan meaningfully lowers interest cost.
- Preparing repayment assumptions for small business equipment financing or renovation borrowing.
Examples
Example 1: Personal loan. Suppose you borrow S$50,000 at 4.2% per year over 5 years. The calculator shows the scheduled installment, how much total interest you will pay, and how much cash you will repay altogether.
Example 2: Mortgage prepayment. If a home loan installment already feels manageable, add an extra S$200 or S$500 per month in the extra payment field. You can quickly compare the interest savings and the reduction in payoff time.
Example 3: Weekly repayment test. Some borrowers prefer to match loan payments to weekly income. Changing the payment frequency helps you see how the repayment pattern changes while keeping the same loan assumptions.
Important Notes
This is an estimate, not a quote. Actual repayments can differ because of processing fees, insurance premiums, disbursement charges, compounding methods, or promotional structures.
Fixed-rate assumption: The calculator assumes the interest rate stays unchanged for the full term. For floating-rate products, test best-case and stress-case scenarios separately.
Prepayment rules vary: Some lenders allow free prepayments, while others charge lock-in or early repayment fees. Check your facility letter before relying on the savings estimate.
Keep the same currency throughout: Although the calculator displays values in dollars, the formula works for any currency if all inputs use the same unit consistently.
Frequently Asked Questions
How is the loan installment calculated?
The calculator uses the standard amortizing loan formula. It combines the principal, fixed periodic interest rate, and total number of payments to estimate one consistent repayment amount for the full term.
What happens if I add an extra payment?
Extra payments usually reduce principal faster, which lowers future interest charges and shortens the payoff period. The calculator compares the accelerated plan against the standard schedule so you can see the difference.
Can I use this for a home loan in Singapore?
Yes. The calculator is suitable for a basic fixed-rate housing loan estimate, although actual mortgage packages may include floating rates, lock-in periods, legal fees, and insurance costs that are not included here.
Does weekly or biweekly repayment save money?
It can, depending on how the lender applies the payments and the effective compounding method. This tool helps you compare repayment frequencies using the same annual rate so you can understand the direction and size of the effect.
Why is the interest amount higher in the early years?
Interest is charged on the remaining balance. At the start of the loan the balance is highest, so a larger share of each repayment goes to interest until more principal has been paid down.
What if my interest rate can change?
If the rate can change, use the calculator more than once with different assumptions. Running a base case and a higher stress-case rate gives a better sense of affordability than relying on one optimistic number.
Is this calculator private to use?
Yes. The calculations are performed in your browser, so the values you enter are not sent to a server by this tool.
Should I always choose the shortest loan term?
Not always. A shorter term reduces total interest but increases each installment. The best option is the shortest term that still leaves you enough monthly cash flow for emergency savings and other obligations.