What the APR Calculator does
This APR calculator works out the true annual percentage rate of a loan once processing fees, documentation charges and compulsory insurance are counted, and sets it next to the advertised interest rate so you can see what the fees really cost. Enter the loan amount, the rate, the term and the fees; the APR, monthly payment, money you actually receive and total cost of credit update as you type.
Two loans at the same interest rate can cost very different amounts: a 3% processing fee taken off a personal loan, or a "0% EMI" with a fee, raises the real rate even though the headline rate does not move. The APR captures that in a single number by asking which rate makes your payments repay exactly the money you receive. It is worked out in your browser with the actuarial method in US Regulation Z; nothing you enter leaves the page.
How to use it
- Enter the amount you are borrowing, the advertised yearly interest rate and the term in years or months.
- Choose how interest is charged. Most bank loans use a reducing balance; some personal, two-wheeler and car loans in India quote a flat rate, which is charged on the full amount for the whole term.
- Enter the processing or origination fee as a percentage or an amount, and say whether it is paid upfront (or deducted from what you receive) or added to the loan.
- Add any other one-off charges and any compulsory monthly charge, such as loan protection you are required to buy.
- Read the APR at the top, then compare the "rate only" and "with fees" columns to see how much the fees add in money and percentage points.
Reading the results
If the APR equals the advertised rate, there are no extra charges. Every point of difference is the cost of fees and charges expressed as interest: a 14.13% APR on a 12% loan means the fees are worth about 2.13% a year over the life of this loan.
Short loans make fees look worse, long loans make them look milder. A fixed fee is spread over fewer months on a short loan, so the same 300 fee raises the APR far more on a one-year loan than a five-year one.
A flat rate is not comparable with an APR. Because flat interest keeps charging on money you have already repaid, a 10% flat rate over three years is roughly an 18% APR. Compare loans by APR, never by flat rate.
The effective annual rate compounds the monthly rate over a year. It is a little higher than the APR and is how the UK and EU representative APRC is stated, so use it when comparing with a British or European advertisement.
Worked example: a 10,000 personal loan at 12% for 3 years with a 300 fee
The monthly payment on 10,000 at 1% a month for 36 months is 10,000 x 0.01 / (1 - 1.01^-36) = 332.14. Over 36 payments you pay 11,957.15, of which 1,957.15 is interest.
The 300 fee is paid upfront, so the money you really receive is 9,700. The APR is the rate at which 36 payments of 332.14 are worth exactly 9,700 today. At 1% a month they are worth 10,000 (too much); at 1.2% a month, 9,663.12 (too little). The answer lies between: 1.178% a month, which is 14.13% a year.
Total cost of credit is 11,957.15 - 9,700 = 2,257.15: the 1,957.15 of interest plus the 300 fee. The effective annual rate is (1.01178)^12 - 1 = 15.08%.
Formulas and scoring rules
- Monthly payment (reducing balance)
payment = P x i / (1 - (1 + i)^-n), with i = annual rate / 12P includes any fee added to the loan.- Monthly payment (flat rate)
payment = (P + P x flat rate x n / 12) / n- Amount financed
amount financed = loan amount - fees paid upfront or deductedRegulation Z calls these prepaid finance charges.- APR (actuarial method)
solve amount financed = (payment + monthly charge) x (1 - (1 + j)^-n) / j for j; APR = 12 x jSolved numerically (Newton's method with a bisection fallback) to better than 0.0001%. Shown to two decimal places.- Total cost of credit
finance charge = total of payments - amount financed- Effective annual rate
EAR = (1 + j)^12 - 1
APR, interest rate and APRC - what is the difference?
The interest rate is the price of the money alone. The APR adds the compulsory costs of getting the loan - processing, origination and documentation fees, required insurance - and expresses the total as a yearly rate. In the United States the method is set by Regulation Z (12 CFR 1026.22 and Appendix J), and a disclosed APR is treated as accurate if it is within one eighth of a percentage point of the exact figure for a regular loan.
In the UK and EU lenders quote an APRC (annual percentage rate of charge), which follows the same idea but compounds the rate over the year. For a monthly loan it equals the effective annual rate shown here. In India the Reserve Bank requires lenders to show an annualised percentage rate in the key fact statement for retail and MSME loans, so you can check a lender's figure against this one.
Which fees should you include?
Include anything you must pay to get the loan: processing or origination fees, documentation or administration charges, stamp duty collected by the lender, and insurance the lender makes compulsory. Leave out costs you would pay anyway or that depend on what you do later, such as late payment fees or optional prepayment charges.
Whether a fee is deducted from the loan or added to it changes the result. A deducted fee reduces the money you receive; a financed fee increases what you owe and you pay interest on it.
Limitations: what the result does not prove
- It assumes equal monthly payments starting one month after the loan is paid out, with no payment holiday, balloon or irregular first period. Loans with odd first periods or irregular payments need the full Appendix J calculation with the actual dates.
- The regulatory definition of which charges count in an APR differs by country and loan type. A lender's disclosed figure may legitimately include or exclude a charge differently from what you enter here.
- Payments are not rounded to whole cents or paise before solving, so a lender's figure can differ in the second decimal place.
- It is a comparison tool, not advice about whether to borrow, and it does not know any lender's actual rates or fees.
Privacy: where your data goes
Everything you paste, type or drop is processed in this browser tab. It is not uploaded, logged, stored or sent to analytics. Session recording and tag-manager scripts are switched off on this page.
Standards and sources
- 12 CFR 1026.22 (Regulation Z) - Determination of annual percentage rate - checked 19 Sep 2026
- 12 CFR 1026 Appendix J - Annual percentage rate computations for closed-end credit
- Reserve Bank of India - Key Facts Statement for loans and advances
- UK FCA Consumer Credit sourcebook (CONC) App 1 - APRC calculation
Frequently asked questions
What is the difference between APR and interest rate?
The interest rate is what you pay for the money itself. The APR also counts compulsory fees and charges and turns the total cost into a yearly rate. With no fees they are equal; every fee pushes the APR above the interest rate.
How do processing fees change the APR of a loan?
A fee taken at the start means you receive less money but repay the same instalments, so the effective rate rises. A 300 fee on a 10,000 loan at 12% over three years raises the APR from 12% to 14.13%; over one year the same fee would add far more.
How do I convert a flat interest rate to APR?
Choose Flat rate, enter the flat rate and the term, and read the APR. As a rough guide a flat rate is close to double on a reducing-balance basis for multi-year loans: 10% flat over three years is about 17.9% APR before any fees.
Is a 0% EMI or 0% finance offer really interest free?
Only if there are no fees and no discount you give up by not paying cash. A 1,200 purchase on 12 monthly payments of 100 with a 5% fee deducted upfront has an APR of about 9.6%, even though the stated interest is zero.
Is it better to pay the processing fee upfront or add it to the loan?
Adding it to the loan means you pay interest on the fee as well, so the total cost is slightly higher, but you keep the full amount in hand. Switch the Paid option between the two to see the difference in money for your loan.
Why does the APR here differ slightly from my lender's figure?
Lenders round payments, count actual days to the first payment, and follow their country's rules on which charges are included. A difference in the second decimal place is normal; Regulation Z itself allows one eighth of a percentage point for regular loans.
What is a good APR for a personal loan?
There is no single good figure: it depends on your country, credit history, the loan's size and term, and prevailing central bank rates. The useful comparison is between offers you have actually received, each with its fees entered here.
Last reviewed by the A2Z.Tools team against the sources listed above.
