Sitemap
One-click navigation to every page on FourLabs.
Text Lab
Daily Tech Lab
Conversion Lab
Dev & Design Lab
Coming Soon
Blog
- How to Calculate Your BMI Correctly (Formula, Chart & Examples)
- Metric vs Imperial: A Practical Comparison (with Conversion Tables)
- Percentage Calculator Guide: Increase, Decrease & Tip Math Made Simple
- How to Calculate Your Exact Age (Years, Months, Days & Leap Years)
- Calorie Calculator Explained: BMR, TDEE & Macro Targets
- UPPERCASE, camelCase, snake_case & Slugs: When to Use Each
- Find and Replace with Regex: A No-Nonsense Cheat Sheet
- Invisible Text: How It Works, Where It Works, Where It Doesn't
- Celsius, Fahrenheit & Kelvin: Formulas, Reference Points & Memory Tricks
- Writing Numbers in Words: Checks, Invoices & Legal Documents
- How to Create a Strong Password in 2026 (Length, Entropy & Real Attacks)
- Lorem Ipsum: What It Actually Means & When to Use Placeholder Text