The APR 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 apr figures and recalculate after changing an assumption. Use it to compare scenarios, then verify any current rate or fee before acting.
Calculate the APR (Annual Percentage Rate) that includes all fees and security to know the real cost of the loan before making a decision.
APR Calculation
APR per year
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APR per month
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Total Interest
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Total costs
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Loan.-
All fees.-
The insurance.-
A month's worth.-
Number of instalments-
Total Payment (Instalments)-
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.
What is APR and why should I know before I borrow?
The Bank of Thailand has mandated financial institutions to disclose the EIR/APR to borrowers.
APR Calculation Formula
Find the monthly rate r that makes the following equation true:
(P − total charges) = PMT × [1 − (1+r)^(−n)] ÷ r
The principal reduction fee that the borrower actually received but still had to pay in full increases the APR, and then APR = ((1+r)^12 − 1) × 100
Costs to be included in APR calculation
Origination fee. - Usually 1-3% of the range.
Collateral valuation fee. - For home and car loans.
Life/credit insurance. - That's a forced purchase with credit.
Accident insurance. - For a home loan.
Account fee. - If you force me to open a bank account.
Example: The impact of fees on APR
Loan 500,000 baht Interest 6% per year Repayment 60 month No fees → APR ≈ 6%
Add fee 15,000 baht (3%) → APR ≈ 7.1%
Increase the deposit 10,000 baht → APR ≈ 7.8%
The shorter the loan term, the greater the impact of the fee on the APR.
Frequently asked questions
What is APR?
The APR (Annual Percentage Rate) is the actual annual interest rate that includes all fees and charges into the calculation, reflecting the real cost of the loan better than the specified interest rate.
How does the APR differ from the normal interest rate?
The normal interest rate does not include the fees and APR insurance fees, including all related costs, so it is always higher than the interest rate specified in the contract. The more fees, the higher the APR, the higher the interest rate specified.
Should I compare APR or interest?
You should always compare the APR because all costs are included. If loan A has a 5% interest rate but a lot of fees, it may have a higher APR than loan B has a 6% interest rate but no fees.
What fees should be included in the APR?
Credit management fees, collateral assessment fees, life/accident insurance, account opening fees, brokerage fees, everything you pay to get a loan should be included in the APR.
Disclaimer: The results of the calculation are estimates of the actual APR of financial institutions may vary according to the definition and calculation method of each institution and is not financial advice.
English calculator guide
How to use the APR Calculator
Use this page to test a specific apr 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 apr estimate instead of relying on a generic example.
Build a baseline apr case with figures that match your situation.
Run a second apr case after changing the rate, period, quantity or other key assumption.
Record the difference between the two apr results and the input responsible for it.
Inputs for the apr estimate
For this apr 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 apr result is calculated
The calculator models principal, interest, repayment timing and term using the assumptions shown on the page. Reusing the same apr inputs will produce the same estimate, which makes the page suitable for controlled scenario comparisons.
Checks for a apr decision
Confirm any current rate, threshold or provider rule that could change the final amount. For apr, 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.
Language QA
Terminology, numeric values and calculator controls checked
Review formula structure, test cases, data sources, effective dates, and risk language accordingly.How to check our · There is no claim that an outside professional reviewed it. Unless the page directly states the name and qualifications. This content is therefore not individual advice.
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