💰 Personal Finance & Amortization
Loan & Mortgage Payment Calculator
Estimate monthly repayments, total interest costs, and view a complete annual amortization schedule.
Quick Presets:
🏡 30-Year Mortgage ($250k @ 6.5%)
🏡 15-Year Mortgage ($350k @ 5.8%)
🚗 5-Year Auto Loan ($28k @ 5.2%)
💳 3-Year Personal Loan ($10k @ 9.5%)
Monthly Payment Summary
$1,580.17 / month
Loan Summary Statistics:
Principal Borrowed
$250,000.00
Total Interest
$318,861.20
Total Cost of Loan
$568,861.20
Total Payments
360 months
Annual Amortization Breakdown:
| Year | Principal Paid | Interest Paid | Total Paid Year | Ending Balance |
|---|
How Loan & Mortgage Calculations Work
Fixed-rate loan amortization calculations determine the exact monthly payment ($M$) required to pay off principal ($P$) over $n$ compounding monthly periods at monthly interest rate $r$:
M = P × [ r(1 + r)ⁿ ] / [ (1 + r)ⁿ − 1 ]
During the early phases of a long-term mortgage, the majority of each payment covers interest charges. As the principal balance decreases, a greater proportion of your fixed monthly payment directly reduces the loan balance.
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Editorial Verification & Authoritative Standards
This calculator follows standard actuarial compounding conventions specified by the Consumer Financial Protection Bureau (CFPB) and federal Truth in Lending Act (TILA) guidelines.
Verified by The Tool Nest Financial Engineering Team • Last audited: August 2026
Frequently Asked Questions
A 15-year mortgage requires higher monthly payments but generally comes with a lower interest rate and builds equity much faster, saving the borrower tens or hundreds of thousands of dollars in total lifetime interest compared to a 30-year term.
The interest rate is the base cost of borrowing the principal balance. The Annual Percentage Rate (APR) includes the interest rate plus additional lender fees, loan origination points, and closing costs, providing a more comprehensive reflection of the true annual cost of borrowing.