Online Personal Loan Repayment Schedule Calculator

This online personal loan repayment schedule calculator estimates the monthly payment and total interest for a fixed-rate loan. Enter the principal, annual percentage rate (APR), and term in years to see the scheduled payment and the interest paid over the full term.

Formula

The calculator uses the standard fixed-payment amortizing-loan formula. It treats the APR as a nominal annual rate divided into monthly periods, and assumes equal payments at the end of each month.

• Monthly payment: M = P × r ÷ [1 − (1 + r)⁻ⁿ]
• Total interest: I = M × n − P
• Monthly rate: r = APR ÷ 1,200
• Number of payments: n = term in years × 12

Here, P is the loan principal in dollars, APR is the annual percentage rate entered as a percentage, r is the monthly rate as a decimal, M is the monthly payment in dollars, n is the number of monthly payments, and I is total interest in dollars. The output rounds the payment to two decimal places; total interest uses that displayed, rounded payment multiplied by the number of payments, then subtracts the principal.

Worked Example

Using the calculator’s defaults: a $20,000 loan, 8% APR, and a five-year term.

1. Convert the APR to a monthly rate: 8 ÷ 1,200 = 0.0066667.
2. Convert the term to payments: 5 × 12 = 60 months.
3. Substitute the values: M = 20,000 × 0.0066667 ÷ [1 − (1.0066667)⁻⁶⁰].
4. The monthly payment is $405.53 after rounding to the nearest cent.
5. Total interest is $405.53 × 60 − $20,000 = $4,331.80.

The payment amount is an estimate from the stated formula. Actual loan schedules may differ if the lender uses different payment dates, rounding practices, or included charges.

Assumptions

• The interest rate stays fixed for the entire term.
• Payments are equal, made monthly, and applied at the end of each monthly period.
• Interest is modelled monthly at APR divided by 12.
• Fees, taxes, insurance, optional products, and other charges are not included.

How an Online Repayment Schedule Works

A repayment schedule, also called an amortization schedule, shows how each payment is divided between interest and principal. Early in a standard amortizing loan, the outstanding balance is larger, so more of the payment goes toward interest. As principal is repaid, the balance falls and the interest portion generally shrinks. The scheduled payment remains level when the rate and terms are fixed.

This calculator provides the monthly payment and total interest, rather than a line for every month. To understand the split, multiply the balance at the start of a period by the monthly rate to estimate that month’s interest. Subtract that interest from the payment to find the principal reduction. For example, on a $20,000 balance at the example monthly rate, the first month’s interest is about $133.33; the rest of the $405.53 payment reduces principal, subject to lender rounding and payment application.

How to Use the Estimate

• Loan amount: Enter the amount financed, not necessarily the amount you receive if a fee is withheld or added to the balance.
• APR: Enter the APR stated in the lender’s offer or disclosure. Do not substitute a monthly rate or a rate quoted for a different product.
• Term: Enter the length in years. The formula converts it to months, so a five-year term means 60 scheduled payments.
• Review both outputs: The payment is the periodic amount in the model; total interest estimates the cost of borrowing over all scheduled payments, separate from repayment of principal.

For an actual schedule, use the lender’s disclosed principal, APR, term, payment amount, and first due date. A lender’s schedule may include a final payment adjustment because of rounding or a first period that is longer or shorter than a month. The calculator’s regular monthly assumption cannot reproduce those details without additional inputs.

Costs, Timing, and Common Misunderstandings

APR and the interest rate are related but are not always interchangeable in a lender’s documents. APR can reflect certain borrowing costs under the lender’s calculation, while the amount and timing of charges can affect what is financed and what the borrower pays. This calculator uses the entered APR directly as the rate for monthly amortization; it does not separately model fees or the method used to calculate a disclosed APR. Obtain the figures and payment schedule from the lender for a precise comparison.

A frequent misconception is that multiplying the original principal by APR and term gives total interest. That simple multiplication ignores the falling balance as principal is paid. The amortization formula accounts for the declining balance, which is why the payment includes both principal and interest throughout the term.

Another point to check is whether the loan is actually fixed-rate with equal monthly payments. A variable rate, irregular payment timing, deferred payments, payment holidays, or added charges can change the schedule. Extra payments also change the balance and may alter the payoff date or later payments; they are not included in this calculation. Ask the lender how any additional payment is applied and consult the current account schedule rather than treating this estimate as a payoff quote.

What the Calculator Does Not Show

The result is a mathematical estimate, not a loan offer, approval decision, or complete account ledger. It does not determine eligibility, predict a lender’s fees, or establish the exact amount due on a particular date. It also does not account for late payments, returned payments, rate changes, payment allocation rules, or a final payoff amount that includes interest accrued since the last scheduled payment.

When checking an online repayment schedule, make sure the displayed loan amount, APR, and term match the documents you are reviewing. Compare the payment frequency and any separate charges as well. If the lender’s disclosed payment differs, its schedule and contractual terms govern the account figures; contact the lender or servicer to clarify the difference.

Frequently Asked Questions

What does a personal loan repayment schedule show?
A full schedule lists each due date, payment, interest portion, principal portion, and remaining balance. This calculator estimates the regular payment and total interest, but does not generate dated monthly rows.

How do I calculate a monthly personal loan payment?
Use the fixed-payment formula with the principal, monthly rate (APR divided by 1,200), and number of monthly payments. The calculator performs those steps and rounds the result to cents.

Does total interest include the amount borrowed?
No. Total interest is the estimated borrowing cost in this model. Total scheduled payments equal principal plus interest, before any fees or other charges.

Why can my lender’s payment differ from this estimate?
The lender may use different rounding, payment dates, financed fees, or a first period that is not exactly one month. Check the loan disclosure and ask the lender which figures or assumptions explain the difference.

Does making extra payments change the schedule?
Usually, an extra payment can reduce the outstanding principal if it is applied that way, changing later interest and possibly the payoff timing. This calculator assumes only the fixed scheduled payments; confirm payment handling with the lender.

This result is an estimate for educational purposes, and the lender’s disclosure gives the exact figures.

Related

• Loan Repayment Schedule Excel Sheet: Formula and Example
• Loan Repayment Schedule Excel Formula and Example
• Loan Repayment Schedule Calculator in Excel

in p | Loan amount | $ | 20000 | 1 | 100000000
in apr | Interest rate (APR) | % | 8 | 0.01 | 100
in yrs | Loan term | years | 5 | 0.0833 | 50
out pmt | Monthly payment | $ | p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2