I Built 25 Free Financial Calculators — No Ads, No Signup, Just Tools

fan ye — Mon, 08 Jun 2026 06:05:42 +0000

Two weeks ago I shared a collection of 6 financial calculators. The response was incredible, so I kept building.

Today, fi-calc.com has 25 completely free calculators covering every major personal finance need:

🏠 Housing
• Mortgage Calculator (full PITI + amortization schedule + pie chart)
• Rent vs Buy Calculator
• House Affordability Calculator
• Refinance Calculator

💰 Investing & Retirement
• Compound Interest Calculator
• Investment Return Calculator
• Future Value & Present Value Calculators
• ROI Calculator
• Retirement Savings Calculator
• 401(k) Calculator
• FIRE Calculator (Financial Independence)

💳 Debt & Loans
• Loan Comparison Calculator
• Auto Loan Calculator
• Student Loan Calculator
• Credit Card Payoff Calculator
• Debt Payoff Calculator (Avalanche method)

📊 Everyday Finance
• Budget Planner (50/30/20 rule)
• Savings Goal Calculator
• Inflation Calculator
• Salary & Take-Home Pay Calculator
• Net Worth Calculator
• Currency Converter (15+ currencies)
• CD Calculator
• Sales Tax Calculator

✨ Tech Stack
• Pure vanilla HTML/CSS/JS — no frameworks
• Chart.js for animated interactive charts
• Responsive design (mobile-friendly)
• All calculations run client-side in your browser
• No data collection, no accounts, no cookies

🔗 Give it a try: fi-calc.com

The entire site is free and open. I built it because I was tired of calculator sites with paywalls, signup walls, and bloated ad experiences.

Would love feedback from the community! What other calculators should I build next?

I Built a Free Suite of 14 Financial Calculators

fan ye — Sun, 07 Jun 2026 16:18:25 +0000

I recently launched Fi-Calc — a free suite of 14 financial calculators that runs entirely in the browser.

No signups. No ads. No data collection. Just tools that help you make better money decisions.

The Calculators

Mortgage Calculator — Monthly payments, total interest, amortization
Compound Interest — See the power of compounding
Investment Returns — CAGR, total return, inflation-adjusted
Retirement Calculator — How much you need to save
401(k) Calculator — Employer match and tax benefits
Loan Amortization — Full schedule with extra payments
Debt Payoff — Snowball vs. avalanche comparison
Rent vs. Buy — Compare renting vs. buying
Savings Goal — How long to reach your target
Emergency Fund — How much you really need
APR Calculator — True cost of borrowing
Dollar Cost Averaging — Model regular investment strategies
Social Security Calculator — Estimate your benefits
CD Ladder Calculator — Maximize CD returns

Tech Stack

Pure HTML/CSS/JS, no frameworks. 100% client-side computation — your data never leaves your browser.

All calculators are free at fi-calc.com.

Would love your feedback and suggestions for new calculators!

DEV Community: fan ye

I Built 25 Free Financial Calculators — No Ads, No Signup, Just Tools

I Built a Free Suite of 14 Financial Calculators

The Calculators

Tech Stack