Mortgage Term Comparison Tool | Compare 15 vs. 30 Year Fixed-Rate Mortgages

🛡️ 100% private — your data never leaves your device. All calculations run directly in your browser.

Mortgage Term Comparison

30-Year Fixed
Monthly P&I $2,528
Total Interest $510,212
Total Principal $400,000
Total Cost $910,212
15-Year Fixed
Monthly P&I $3,321
Total Interest $197,780
Total Principal $400,000
Total Cost $597,780
Option B saves you $312,432 in total interest.

Choosing the right mortgage term is one of the most significant financial decisions a homeowner will make, impacting both monthly cash flow and long-term wealth accumulation. The Mortgage Term Comparison Tool is a high-precision utility designed to provide a side-by-side analysis of different loan durations—most commonly the 15-year and 30-year fixed-rate options. While a 30-year mortgage offers lower monthly payments and increased flexibility, a 15-year mortgage typically commands a lower interest rate and results in massive interest savings over the life of the loan. This tool allows you to input your loan amount and custom interest rates for two different scenarios, instantly revealing the “true cost” of each path.

This utility features a premium white glassmorphic interface with a clean, high-contrast design system, ensuring a seamless and modern user experience across all devices. In strict adherence to our Privacy-First Protocol, the script is 100% private—your data never leaves your device. All loan amounts, interest rates, and amortization projections are processed locally within your browser. No sensitive financial data is ever stored on a server or shared with third parties. Use this tool to visualize the trade-off between monthly affordability and total interest paid, empowering you to choose the mortgage structure that best aligns with your financial goals.