The calculator uses a standard amortising-loan model to compare principal, interest and term. It is a planning estimate, not a bank approval or loan offer.
How the rule works
Loan principal is property price less downpayment. Early payments contain more interest; later payments contain more principal. Floating-rate packages can change actual instalments.
Calculation method
Payment = P×r×(1+r)^n ÷ ((1+r)^n−1), where P is principal, r monthly rate and n number of payments.
Three practical examples
- SGD 750,000 at 3% for 25 years: about SGD 3,557 monthly.
- At 4% for the same term: about SGD 3,959, illustrating rate risk.
- At 3% for 20 years: about SGD 4,159 monthly but normally less total interest.
Special cases and limits
- BSD, ABSD, legal fees, valuation, insurance and renovation are excluded.
- Banks also assess TDSR, LTV, income stability and credit.
- Lock-in periods, repricing and early-redemption charges depend on the contract.
Frequently asked questions
Does a low instalment prove affordability?
No. Include upfront costs, upkeep and a rate-rise buffer.
Is this a loan quote?
No, it is a mathematical estimate.
Sources and review
Written and reviewed by the QuickCalc editorial team. Last reviewed: 4 Sep 2026. To report a rule or calculation error, email contact@zevlis.com.