How to Calculate Personal Loan (Flat Rate) in Singapore: A Step-by-Step Guide
Singapore banks advertise personal loans at flat rates. This shows the instalment and the effective interest rate.
Interest rates, instalments and returns compound over years, so a small difference in rate or tenure turns into thousands of dollars. Working the numbers out yourself makes it easier to compare bank offers, avoid expensive debt and plan savings goals.
What you need
- Loan amount (S$)
- Flat rate (% a year)
- Term (years)
Step by step
- Enter the loan amount (S$).
- Enter the flat rate (% a year).
- Enter the term (years).
- The results update as you type, or press Calculate.
- Read the monthly instalment first, then the supporting figures below it.
The formula
Interest = P × flat rate × years; EIR is solved from the instalment stream.
Worked example
For example, with these inputs:
- Loan amount (S$): 15,000
- Flat rate (% a year): 3.5
- Term (years): 3
the calculator returns:
- Monthly instalment: S$460.42
- Total interest: S$1,575.00
- Effective interest rate: 6.60%
A second example
Now change the inputs to:
- Loan amount (S$): 18,750
- Flat rate (% a year): 3.5
- Term (years): 3
the calculator returns:
- Monthly instalment: S$575.52
- Total interest: S$1,968.75
- Effective interest rate: 6.60%
Practical tips
- Check for early repayment penalties and processing fees before taking any loan.
- Paying credit card bills in full avoids interest charges of around 27% a year or more.
- Use realistic return assumptions; long-term projections at high rates can be very misleading.
- Compare loans by effective interest rate, not flat rate; the EIR is roughly double the flat rate.
Background
Calculators make it easy to compare scenarios side by side: a shorter tenure versus a lower instalment, a higher deposit versus more cash in hand, or paying down debt versus investing. Seeing the total cost, not just the monthly figure, usually makes the better choice obvious.
Inflation erodes buying power, so a savings goal set in today's dollars needs to be adjusted upwards for the years it will take to reach it. Singapore's core inflation has varied widely over the past decade, so it is worth testing a range of rates.
An emergency fund of three to six months of essential expenses protects you from having to borrow at high rates when something unexpected happens. Once that buffer is in place, extra savings can go towards longer-term goals and investments.
Related calculations
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- Discount Calculator: Works out sale prices during Great Singapore Sale, 11.11 and other promotions.
- Split the Bill Calculator: Splits a bill evenly.
- Credit Card Payoff Calculator: Shows how long a card balance takes to clear at a fixed payment.
Want to skip the arithmetic? The free Personal Loan Calculator (Flat Rate) does all of this instantly and updates as you type.
Run your own numbers: Personal Loan Calculator (Flat Rate)