Loan Repayment Calculator
Simulate monthly loan repayments, lifetime interest costs, and total repayment sums instantly.
$ (e.g. 250,000)
% per year
years
Monthly Payment
-
Total Repayment
-
Total Interest Paid
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What is the Online Loan & Mortgage Calculator?
The free Loan Repayment Calculator helps you estimate monthly installment payments and total interest costs for fixed-rate borrowing, such as mortgages, auto loans, and personal loans. Enter the principal amount, annual interest rate, and repayment term to calculate your estimated monthly payment, overall interest, and total payoff amount, along with an annual amortization schedule table.
Whether evaluating a 30-year fixed home mortgage, assessing an auto financing offer, or comparing debt consolidation rates, this calculator provides immediate financial clarity. Built-in memory registers (MC, MR, M+, M−, MS) allow you to tally multiple loan liabilities into a comprehensive household debt profile.
Step-by-Step Guide: How to Calculate Loan Repayments
- Input Loan Principal: Enter the total borrowing amount (e.g.,
$350,000or$25,000). - Input Annual Interest Rate (APR %): Enter the annual percentage rate (e.g.,
6.5%or4.25%). - Input Loan Term: Specify duration in years (e.g.,
30 years) or total months. - Click Calculate:
- Monthly Payment: Fixed monthly principal and interest installment.
- Total Interest: Cumulative interest cost paid over the lifetime of the loan.
- Total Repayment: Sum of original principal plus total interest paid.
- Save to Memory: Retain monthly obligations with MS and M+ for household budget planning.
Core Loan Amortization Formula
- Monthly Payment Formula:
Monthly Payment = P × [r(1 + r)ⁿ] ÷ [(1 + r)ⁿ − 1] - Variable Definitions:
P= Principal Loan Amount,r= Monthly Interest Rate (APR ÷ 12 ÷ 100),n= Total Monthly Payments (Years × 12) - Total Interest Paid:
Total Interest = (Monthly Payment × n) − P - Total Repayment:
Total Payback = Monthly Payment × n
Practical Real-World Calculation Examples
- 30-Year Fixed Home Mortgage: $350,000 loan at 6.50% APR for 30 years (360 months):
Monthly Payment = $2,212.24,Total Interest = $446,406.84,Total Payback = $796,406.84. - 5-Year Auto Loan: $25,000 vehicle loan at 5.00% APR for 5 years (60 months):
Monthly Payment = $471.78,Total Interest = $3,306.86,Total Payback = $28,306.86. - Impact of Shorter Loan Term: Taking a 15-year mortgage on $300,000 at 6.0% raises monthly payments to $2,531.60 but slashes lifetime interest to $155,688 (saving over $190,000 compared to a 30-year term).
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Frequently Asked Questions (FAQ)
How is a monthly loan payment calculated?
Monthly loan payments are calculated using standard fixed amortization: P × [r(1+r)ⁿ] / [(1+r)ⁿ − 1], where P is principal, r is the monthly interest rate, and n is the total number of monthly payments.
What is the difference between principal and interest?
Principal is the original money borrowed that goes toward paying off the loan balance. Interest is the fee charged by the lender for borrowing that money.
How does a 15-year mortgage compare to a 30-year mortgage?
A 15-year mortgage has higher monthly payments because the principal is paid off faster, but it significantly reduces total lifetime interest charges compared to a 30-year mortgage.
How does a higher interest rate affect my total loan cost?
A higher interest rate increases both your monthly payment and your cumulative lifetime interest. For example, a 1% rate increase on a $300,000 mortgage adds tens of thousands of dollars in total interest.
What is the difference between fixed-rate and adjustable-rate (ARM) loans?
A fixed-rate loan maintains the exact same interest rate and payment throughout the term. An adjustable-rate mortgage (ARM) has a rate that fluctuates based on market benchmarks after an initial fixed period.
How do extra principal payments shorten a loan term?
Making extra principal payments directly reduces the remaining loan balance, which decreases the future interest accrued and shortens the total payback period.
Can this calculator be used for auto loans and personal loans?
Yes, enter the loan principal, annual interest rate, and term in years/months to calculate exact monthly payments for car loans or personal debt.
Does the monthly payment include property taxes and insurance (PITI)?
This calculator computes the core Principal & Interest (P&I). To calculate full PITI, add your local monthly property taxes, homeowner insurance, and PMI to the calculated payment.
Can I combine multiple loans into a single total repayment figure?
Yes, use the memory key (M+) to store monthly installments from multiple debts (e.g., mortgage + auto loan) to view your total monthly debt commitment.
Is this loan calculator free on mobile devices?
Yes, it is 100% free with no registration or app downloads required across mobile browsers on iOS and Android.
Does this calculator provide personalized financial lending advice?
No, this tool provides mathematical simulations only. Consult your licensed lending institution for official loan underwriting and qualification terms.