Free · No sign-up · No tracking
Small tools.
Sharp answers.
IFN Tools is a workbench of single-purpose utilities — salary math, fitness numbers, text tools and more. Each one does exactly one job, instantly, in your browser.
Career & Money
Salary to Hourly Calculator
Enter your annual salary and see exactly what you earn per hour, week, and month — with real work hours, not the lazy 2,080-hour shortcut.
Freelance Rate Calculator
Start from the annual income you want and work backwards to the hourly rate that actually gets you there — taxes, expenses, and unbilled hours included.
Health & Fitness
BMR Calculator
Find your Basal Metabolic Rate with the Mifflin-St Jeor equation, layer on your activity level, and get a daily calorie target you can actually use.
Macro Calculator
Turn your stats into a daily macro split — protein, carbs, and fat in grams, tuned for cutting, maintaining, or lean bulking.
Protein Intake Calculator
Enter your weight and goal to get a daily protein target in grams — plus what that looks like as actual food on a plate.
Writing & Text
Study
AI & Dev
Token Counter
Paste text and see how many tokens it costs across GPT, Claude, and Gemini — plus what it does to your API bill and context window.
Case Converter
Paste text once and get every case at the same time — camelCase, snake_case, kebab-case, and plain Title Case. Click any result to copy.
How we build
One job per tool, done properly
Every tool runs entirely in your browser. Your numbers never leave your device — nothing to sign up for, nothing tracked.
We show the math, not just the answer: formulas, breakdowns and the assumptions behind every result.
New tools ship regularly. Each one follows the same design, so the tenth tool feels like the first.