Loan Repayment Calculator with Amortization Schedule

Calculator inputs

The page keeps a single-column flow overall, while the calculator fields use a responsive 3-column, 2-column, and 1-column layout.

Loan amount

Enter the starting principal before optional fee financing.

Annual interest rate (%)

Use nominal annual rate, such as 6.50.

Payment frequency

Frequency changes both payment size and schedule length.

Loan term (years)

Whole years only.

Additional term (months)

Use 0 to 11 months.

Extra payment per period

Optional extra amount added to each scheduled payment.

Upfront fee added to balance

Useful for financed setup or origination fees.

First payment date

The schedule starts from this payment date.

Reset form

Example data table

These sample cases help users compare how term, rate, and extra payments affect total interest and payoff timing.

Loan Amount	Rate	Term	Frequency	Extra Payment	Use Case
$25,000	6.50%	5 years	Monthly	$0	Standard fixed installment plan
$18,500	7.10%	4 years 6 months	Biweekly	$25	Faster payoff with smaller frequent payments
$42,000	5.80%	7 years	Monthly	$100	Interest reduction through consistent overpayment

Formula used

Periodic rate
r = annual interest rate / payments per year

Scheduled payment
Payment = P × r / (1 - (1 + r)^-n)
P is financed principal, r is periodic rate, and n is total payment periods.

Zero-interest fallback
Payment = P / n

Period interest
Interest = Opening Balance × r

Principal paid
Principal = Payment - Interest

Ending balance
Ending Balance = Opening Balance - Principal
Extra payments directly increase principal reduction, which lowers future interest charges.

How to use this calculator

Enter the loan amount you want to repay.
Add the annual interest rate used by your lender.
Choose the full loan term in years and extra months.
Select monthly, biweekly, or weekly payments.
Include any extra payment and financed upfront fee if needed.
Set the first payment date, then calculate the repayment plan.
Review the summary, chart, and amortization schedule.
Export the full schedule as CSV or PDF for records.

FAQs

1) What does the amortization schedule show?

It lists every installment with payment date, beginning balance, payment amount, principal, interest, extra payment, ending balance, and cumulative interest. This helps you see exactly how the debt shrinks over time.

2) How is the regular payment calculated?

The calculator converts the annual rate into a periodic rate, then applies the standard amortizing loan formula. If the rate is zero, it simply divides the financed balance by the number of payment periods.

3) What happens when I add extra payments?

Extra payments reduce principal faster. That lowers future interest charges, shortens the repayment timeline, and usually reduces the total amount repaid over the life of the loan.

4) Why can the final payment be smaller?

Once the remaining balance becomes very small, the last installment only needs to cover the leftover principal and final interest. That often makes the last payment lower than the regular scheduled amount.

5) Can I use this for a zero-interest loan?

Yes. The calculator supports zero-interest repayment plans. In that case, each payment is just the financed balance divided evenly across the selected number of repayment periods.

6) Which payment frequency should I choose?

Choose the schedule that matches your loan agreement or budget cycle. Monthly is common, while biweekly or weekly plans can help spread cash flow and may reduce interest when paired with extra payments.

7) Are fees included in the repayment math?

Yes, if you enter an upfront fee, the tool adds it to the financed balance. That lets you estimate repayment more realistically when setup or origination charges are rolled into the loan.

8) Why might lender numbers differ slightly?

Lenders may use different rounding rules, payment calendars, compounding methods, or escrow handling. This calculator gives a strong estimate, but your official statement should always be the final reference.