Building an Advanced TVM & Loan Amortization Calculator with Pure JavaScript

Calculating compound interest, Time Value of Money (TVM), and loan amortization schedules is essential for financial application development. Instead of relying on heavy third-party libraries, I built a lightweight, pure Vanilla JavaScript calculator that runs entirely client-side.

🌟 Key Features

1. TVM Calculator (Time Value of Money):

   • Solves for Future Value ($FV$), Present Value ($PV$), and Monthly Payments ($PMT$).
   • Uses compounding interest formulas: $$FV = PV (1 + r)^n + PMT \left[ \frac{(1 + r)^n - 1}{r} \right]$$

2. Loan Amortization Engine:

   • Calculates fixed monthly mortgage/loan payments.
   • Computes total interest paid vs. total principal repaid over time.

3. Performance & Privacy:

   • Zero dependencies (Pure HTML, CSS, JavaScript).
   • Fast, client-side execution with 100% data privacy.

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🔗 Live Demo & Full Tool

You can test the full interactive calculator and amortization schedule tracker live here:
👉 Advanced Finance Calculator on Global Tools Box
https://www.globaltoolsbox.online/2026/07/advanced-finance-calculator-2026-tvm-amortization.html
Feel free to check it out and share your thoughts or logic optimizations!