Loan Payment Calculator

Intro

Compare a fixed loan payment with the interest accumulated over its term. Use the principal you actually need to borrow; borrowing extra increases both payment and interest.

A loan calculator estimates the instalment for a lump sum borrowed and repaid over a specified number of months. Start by separating the amount you actually receive from any fees a lender finances or deducts at origination. The resulting payment is a planning estimate, not a commitment that a bank will offer that rate or approve an application.

The amount borrowed is the principal. A larger principal usually increases the monthly payment, while a longer term may lower each instalment but increase total interest. A fixed monthly payment does not mean the interest portion remains fixed. The proportion paying down principal normally grows as the outstanding balance falls.

About this result

How to use

Enter the amount and nominal annual rate; choose a term; calculate; compare the monthly payment with the full-term total. Use the same currency for every amount.

Formula

Monthly rate r = annual percentage rate ÷ 1200 and n = monthly payments. If r > 0, payment M = P × r ÷ [1 − (1 + r)^(-n)]; if r = 0, M = P ÷ n. P is the borrowed principal. The first result is monthly principal plus interest. The second is total interest only; add the initial principal to estimate all scheduled repayments.

For an ordinary fully amortizing fixed-rate loan with monthly payments, payment = P × r ÷ [1 − (1+r)^(−n)], where P is starting principal, r is the monthly decimal interest rate and n the payment count. This is equivalent to the usual annuity formula. If r is zero, payment equals P divided by n; a precomputed-interest loan needs a different model.

If the quoted nominal annual rate is 8%, the corresponding simple monthly rate for this model is 0.08 ÷ 12, not 8 or 0.08 by itself. For a two-year monthly loan n is 24, whereas a 12-month loan uses n equal to 12. Confirm that the lender uses this same interest convention.

Worked example

Loan amount: 100000; Nominal annual interest rate (%): 12; Repayment term (months): 60. Monthly principal and interest: 2224.44; Total interest: 33466.69.

Loan amount: 80000; Nominal annual interest rate (%): 12; Repayment term (months): 60. Monthly principal and interest: 1779.56; Total interest: 26773.35.

Consider borrowing 15,000 monetary units at a fixed nominal rate of 12% yearly for 36 months, with no additional charges. The monthly rate is 0.12 divided by 12, or 0.01. The amortization formula gives about 498.21 per month, approximately 17,935.73 over the term and 2,935.73 of interest before rounding adjustments.

Multiplying the unrounded payment by 12 gives total scheduled payments of approximately 104,386.11 units, so the modelled interest cost is approximately 4,386.11 units. A lender may round each instalment and change the final one slightly. These numbers deliberately exclude fees, taxes and insurance.

Now keep the same loan amount and rate but lengthen the term to 24 months. The estimated monthly payment becomes approximately 4,522.73 units; scheduled interest rises to about 8,545.50 units. Lower monthly cash pressure does not mean a lower total cost. Compare the alternatives with your available monthly budget.

Understand the calculation

The first result is monthly principal plus interest. The second is total interest only; add the initial principal to estimate all scheduled repayments.

Enter the amount and nominal annual rate; choose a term; calculate; compare the monthly payment with the full-term total. Use the same currency for every amount.

Use the principal you actually need to borrow; borrowing extra increases both payment and interest.

The estimate assumes one equal payment at the end of each month. Early payments contain more interest because the outstanding balance is larger; later payments reduce more principal. The result is rounded to two decimals, while totals are calculated from the unrounded payment.

Do not enter a percentage as a decimal fraction: 6.5 means 6.5%, not 0.065. A shorter term raises the monthly payment but usually reduces total interest. Compare fees and the actual repayment schedule separately.

This is a fixed-rate, fully amortizing estimate, not a lender offer. It excludes fees, taxes, insurance, changes in rates, and lender-specific rounding. Check an actual loan offer before deciding.

To understand a long repayment period, compare the monthly reduction with the accumulated interest. An amortization table clarifies why early payments can feel interest-heavy even when the scheduled EMI stays constant.

Questions

Is this the total borrowing cost?

No. The calculation covers principal and contractual interest only; fees and other charges can increase the cost.

What happens at 0% interest?

The monthly payment becomes the principal divided by the number of months, so the interest component is zero.

Does a longer term lower the payment?

Usually yes for the same amount and rate, but paying for more months generally increases total interest.

Is the total interest the same as total repayments?

No. Total interest excludes the borrowed principal. Add principal to interest for an estimated sum of monthly repayments.

Why enter the exact principal?

Use the principal you actually need to borrow; borrowing extra increases both payment and interest.

What is the difference between a loan rate and APR?

The interest rate determines interest under the contract, while APR may include specified financing charges as well as interest. They are not interchangeable inputs to a simple monthly-payment formula. Compare competing disclosures on the same basis and ask how upfront fees affect the cash you actually receive.

Can a lender deduct fees from the amount I receive?

Some personal lenders charge an origination or documentation fee. It may be collected upfront, withheld from proceeds, or financed according to the contract. In every case, compare money received against total money repaid rather than relying on the advertised nominal interest rate alone.