Sitemap
Browse every tool, article and page on HT99 Tools.
📄 Main Pages
🛠️ Tools by Category
Total: 118 tools across 10 categories.
Finance Calculators (16 tools)
Loans, mortgages, investments, taxes — built with verified formulas from official sources.
- → Loan Calculator
- → Mortgage Calculator
- → EMI Calculator
- → Compound Interest Calculator
- → Simple Interest Calculator
- → Savings Goal Calculator
- → Retirement Calculator
- → ROI Calculator
- → APR Calculator
- → Auto Loan Calculator
- → Credit Card Payoff Calculator
- → Income Tax Estimator
- → Sales Tax Calculator
- → Currency Converter
- → Inflation Calculator
- → Net Worth Calculator
Health & Fitness (12 tools)
BMI, BMR, calorie, body composition — using CDC, WHO, and peer-reviewed formulas.
Math Calculators (12 tools)
Algebra, geometry, statistics — with formulas shown and step-by-step examples.
Unit Converters (12 tools)
Length, weight, temperature, data storage, currency — accurate to 8 decimal places.
Text & SEO Tools (12 tools)
Word counters, case converters, readability checkers — privacy-first, runs in browser.
Developer Tools (15 tools)
JSON, Base64, regex, JWT, hashes — per IETF RFCs and NIST standards.
- → JSON Formatter & Validator
- → JSON to CSV Converter
- → Base64 Encode & Decode
- → URL Encode & Decode
- → HTML Entity Encode/Decode
- → Hash Generator
- → Regex Tester
- → HTML Minifier
- → CSS Minifier
- → JavaScript Minifier
- → CSS to Inline Styles
- → JWT Decoder
- → ASCII Table Reference
- → Cron Expression Helper
- → Markdown Preview
Generators (12 tools)
Password, UUID, QR codes, gradients — using cryptographically secure RNG where it matters.
Time & Date (8 tools)
Age, date difference, time zones, countdowns — handles edge cases like leap years.
Color & Design (7 tools)
HEX, RGB, HSL, WCAG contrast — with the exact W3C relative luminance formula.
Everyday Utilities (12 tools)
Tips, fuel cost, dice, GPA — practical tools for daily life.
📚 Articles
Total: 31 articles
Finance (7 articles)
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How Loan Amortization Works: A Complete Beginner's Guide
9 min · Jan 15, 2025 -
Fixed vs Variable Interest Rates: Which Is Better in 2025?
8 min · Feb 2, 2025 -
Compound Interest Explained: The Eighth Wonder of the World
10 min · Feb 18, 2025 -
How Much House Can I Afford? The 28/36 Rule Explained
11 min · Mar 5, 2025 -
Avalanche vs Snowball: Best Credit Card Payoff Strategies
9 min · Mar 22, 2025 -
Retirement Savings Milestones by Age: Are You on Track?
12 min · Apr 8, 2025 -
APR vs APY: The Critical Difference That Costs You Money
7 min · Apr 25, 2025
Health & Fitness (7 articles)
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Why BMI Alone Is Misleading: A Healthier Way to Track Fitness
8 min · Jan 20, 2025 -
How Many Calories Do I Really Need? TDEE Science Explained
10 min · Feb 10, 2025 -
Macros 101: How to Calculate Protein, Carbs and Fat for Your Goals
11 min · Feb 28, 2025 -
8 Glasses a Day and Other Water Intake Myths Debunked
7 min · Mar 15, 2025 -
Heart Rate Training Zones: Train Smarter, Not Harder
9 min · Apr 2, 2025 -
Body Fat Measurement Methods Compared: Which Is Most Accurate?
10 min · Apr 22, 2025 -
Pregnancy Weight Gain: What's Normal and What's Not
8 min · May 10, 2025
Mathematics (4 articles)
Developer (6 articles)
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Understanding JSON: A Practical Guide for Developers
10 min · Jan 30, 2025 -
How Base64 Encoding Works and When to Use It
8 min · Feb 22, 2025 -
Regex Mastery: A Practical Cheat Sheet with Real Examples
12 min · Mar 18, 2025 -
Hashing vs Encryption: What Every Developer Must Know
9 min · Apr 12, 2025 -
Secure Password Best Practices for End Users and Developers
10 min · May 5, 2025 -
JWT Security Best Practices Every Backend Developer Should Follow
11 min · May 25, 2025
Text & SEO (3 articles)
Time & Productivity (2 articles)
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