The Interest, Reduce Principal, Reduce Interest Calculator estimates a loan and interest estimate for your scenario from the quantities, rates, period, units and other assumptions requested on the page. Replace the example values with your own interest reduce principal reduce interest figures and recalculate after changing an assumption. Use it to compare scenarios, then verify any current rate or fee before acting.
Calculate interest and principal in a reduced balance with a full repayment schedule.
Calculation results
instalment/month
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Total Interest
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Total payment.
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⚠️ IMPORTANT: Notes on the calculation
• This calculation is an estimate only. Actual amount may vary depending on contract terms.
The system does not include paperwork, asset assessments or other financial institution fees.
• For full details, ask your bank or financial institution for a repayment schedule.
Payment Schedule (Click to view)
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The principal.
interest
Remains.
Reducing Balance.
The Reducing Balance Method is a method of calculating interest from the actual principal remaining in each instalment. When the principal is reduced, the interest in the next instalment is reduced as well, and the principal paid in each instalment is increasing. The formula PMT = P × [r(1+r)ⁿ] / [(1+r)ⁿ - 1]
Frequently asked questions
How is the interest rate calculated?
Interest per instalment = remaining principal amount × interest rate per month Principal paid = remaining principal - interest for that instalment New principal = remaining principal - principal paid This way interest decreases every instalment.
How much is the difference between a fixed and a variable interest rate?
Loan 1 million baht interest 6% loan 5 year: The reduction of the capital interest total approximately 160,000 baht fixed interest total approximately 300,000 baht almost double the difference for the same repayment period
How much interest does the cash flow save?
The earlier you pay off, the greater the total interest savings. For example, if you pay off 100,000 baht in the year 1 of the loan 3 million 6.5% 30 years, you save more interest than 300,000 baht.
What is compound interest?
Interest calculated from principal plus accumulated interest makes money grow faster than ordinary interest. Formula: A = P(1+r/n)^(nt) where P=principal, r=interest rate, n=multiplications per year, t=number of years
What is the rule 72 used to calculate?
Use an estimate of the number of years that money will increase in 2 times: Number of years = 72 ÷ interest rate. For example, interest 6% per year money will be 2 times in 72÷6 = 12 years A simple rule for financial planning
What is the current interest rate on savings deposits in Thailand?
General savings are at 0.5-1.0% per year Regular deposits are at 12 months at 1.5-2.5% per year Special savings accounts are at 1.5-3% Check current rate from Bank of Thailand bot. or. th
Is interest on deposits taxable?
Yes, interest on bank deposits is tax deductible at the point of payment 15% by the bank except interest on savings deposits not exceeding 20,000 baht per year combined on all accounts can be claimed back or credited with tax at the end of the year.
Check before using results
Summary before deciding
This calculation result is suitable for preliminary planning. Actual figures should be checked from documents or official sources before making important decisions.
The calculation is based on the information you enter on this page.
Special cases may require additional information.
It is recommended to record or compare the results with the related tools below.
Disclaimer: The calculations are estimates. Actual amounts may vary depending on the terms of the contract.
English calculator guide
How to use the Interest, Reduce Principal, Reduce Interest Calculator
Use this page to test a specific interest reduce principal reduce interest scenario. Enter your own values in the calculator above, review the units beside each field, and recalculate after changing an assumption. The result updates the interest, reduce principal, reduce interest estimate instead of relying on a generic example.
Build a baseline interest reduce principal reduce interest case with figures that match your situation.
Run a second interest reduce principal reduce interest case after changing the rate, period, quantity or other key assumption.
Record the difference between the two interest reduce principal reduce interest results and the input responsible for it.
Inputs for the interest reduce principal reduce interest estimate
For this interest reduce principal reduce interest calculation, check the quantities, rates, period, units and other assumptions requested on the page. The result is designed to show a loan and interest estimate for your scenario, not a guaranteed provider price or official decision.
How the interest reduce principal reduce interest result is calculated
The calculator models principal, interest, repayment timing and term using the assumptions shown on the page. Reusing the same interest reduce principal reduce interest inputs will produce the same estimate, which makes the page suitable for controlled scenario comparisons.
Checks for a interest reduce principal reduce interest decision
Confirm any current rate, threshold or provider rule that could change the final amount. For interest reduce principal reduce interest, Use the result to compare affordability, not as a lending offer. Check the lender’s effective rate, fees, insurance, payment schedule and approval conditions before committing. Check the important inputs and any current provider or authority rules before using the result for a decision.
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