Car Loan
Calculator
Calculate your monthly car loan payment, total interest, and full amortisation schedule instantly — with down payment, trade-in, and tax support.
Calculate Your Car Payment
Enter your loan details below. Monthly payment, interest, and amortisation update instantly.
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Car Loan Calculator: Estimate Monthly Payments Easily
Buying a car is likely one of the largest financial decisions you’ll make outside of a home purchase. Understanding exactly what you’ll pay each month — and how much of that goes to interest rather than the car itself — is the foundation of any smart auto purchase decision. This free car loan calculator computes your exact monthly payment using the standard amortisation formula, shows the complete principal vs interest breakdown, generates a full amortisation schedule, and tells you how much you’d save with a larger down payment or shorter term.
Quick example: A S$30,000 loan at 4.5% APR over 60 months: Monthly payment = S$559. Total interest = S$3,540. Total cost = S$33,540. Use the calculator above to model your exact scenario with down payment, trade-in, and tax included.
What Is a Car Loan Calculator?
A car loan calculator computes your monthly repayment amount based on the loan principal, interest rate (APR), and loan term. It uses the standard loan amortisation formula used by every lender worldwide — the same calculation banks use when they generate your loan offer. Unlike a lender’s calculator, this tool lets you model multiple scenarios instantly: changing the term, increasing the down payment, or adding extra monthly payments to see exactly how each variable affects your total cost.
How to Calculate Car Loan Payments
Car loan payment formula:
Monthly Payment = P × [r(1+r)^n] / [(1+r)^n – 1]
Where:
P = Loan principal (vehicle price – down payment – trade-in + taxes + fees)
r = Monthly interest rate (APR ÷ 12 ÷ 100)
n = Loan term in months
Example: S$30,000 loan, 4.5% APR, 60 months
r = 0.045/12 = 0.00375 | n = 60
Payment = 30,000 × [0.00375 × (1.00375)^60] / [(1.00375)^60 – 1] = S$559.14
Factors That Affect Your Monthly Car Payment
| Factor | Effect on monthly payment | Effect on total interest |
|---|---|---|
| Higher vehicle price | Increases payment proportionally | Increases interest |
| Larger down payment | Reduces payment (lower principal) | Reduces total interest significantly |
| Trade-in value | Reduces payment (acts as down payment) | Reduces interest |
| Higher APR | Increases payment | Significantly increases total interest |
| Longer term | Reduces monthly payment | Significantly increases total interest |
| Sales tax | Increases payment (added to principal) | Increases interest if tax financed |
How Interest Rates Impact Car Loans
Interest rate (APR) is the single biggest variable in the total cost of your loan. The difference between a 3% and 8% APR on a S$30,000, 60-month loan is dramatic:
| APR | Monthly payment | Total interest | Total cost |
|---|---|---|---|
| 2% | S$526 | S$1,554 | S$31,554 |
| 4% | S$553 | S$3,150 | S$33,150 |
| 6% | S$580 | S$4,799 | S$34,799 |
| 8% | S$608 | S$6,498 | S$36,498 |
| 12% | S$667 | S$10,045 | S$40,045 |
This illustrates why improving your credit score before applying, and comparing rates from multiple lenders, is so financially valuable. A 4% rate reduction saves S$4,891 in interest on a S$30,000 loan — more than a year’s worth of payments.
Loan Term vs Monthly Payment: The Trade-off
Longer loan terms reduce your monthly payment but dramatically increase total interest. This table shows the same S$25,000 loan at 5% APR across different terms:
| Term | Monthly payment | Total interest | Total cost |
|---|---|---|---|
| 24 months | S$1,096 | S$1,298 | S$26,298 |
| 36 months | S$749 | S$1,963 | S$26,963 |
| 48 months | S$575 | S$2,634 | S$27,634 |
| 60 months | S$472 | S$3,306 | S$28,306 |
| 72 months | S$402 | S$3,987 | S$28,987 |
| 84 months | S$352 | S$4,668 | S$29,668 |
A 7-year loan costs S$3,370 more in interest than a 3-year loan for the same car — that’s 13.5% of the car’s original price paid purely in interest beyond what a shorter-term loan would cost.
Tips to Reduce Your Total Interest Cost
Maximise your down payment
A larger down payment reduces principal — every dollar of down payment saves you interest for the full loan term. A 20% down payment is a strong target; even 10% meaningfully improves your position.
Improve credit before applying
Credit score is the primary determinant of your APR. A 100-point score improvement can reduce rates by 2–4%. Pay down existing debt and avoid new credit inquiries 3–6 months before car shopping.
Get pre-approved from multiple lenders
Don’t accept the dealer’s financing without comparison. Credit unions, banks, and online lenders often beat dealer rates. Pre-approval from 2–3 lenders takes 30 minutes and can save thousands.
Make extra principal payments
Even S$50–100 extra per month significantly reduces your payoff timeline. Use the extra payment field in the calculator above to see exactly how much time and interest you’d save.
Leasing vs Buying: Key Differences
| Factor | Buying (loan) | Leasing |
|---|---|---|
| Monthly cost | Higher (building equity) | Lower (no equity) |
| Ownership | You own the car after payoff | Return car at lease end |
| Mileage limits | None | Typically 10,000–15,000 mi/year |
| Customisation | Full freedom | Restricted |
| Long-term cost | Lower (no perpetual payments) | Higher (continuous payment) |
| Best for | Long-term ownership, high mileage drivers | New car every 2–3 years, low mileage |
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Frequently Asked Questions
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