We all do it. Checking if a password is strong enough, tweaking a CSS gradient for the tenth time, wondering how much water we should actually be drinking, trying to split a dinner bill without starting an argument. Small tasks. But each one sends you to some random website full of ads, or forces you to sign up for something you will never use again.
Today we are adding 12 new tools to Kitmul. They cover health, security, CSS design, and everyday calculations. All free, all running in your browser, all private. Your data never leaves your device.
Health
Three calculators that cover body composition, metabolism, and hydration. They use well-established medical formulas and give you results instantly, without uploading anything anywhere.
BMI Calculator
The BMI Calculator computes your Body Mass Index from your weight and height. Metric or imperial, your choice. The result comes with a color-coded health category based on the WHO classification: underweight, normal, overweight, or obese.
The formula itself is simple (weight in kg divided by height in meters squared). What matters is the context. The tool explains what each range means and what it implies for your health in general terms. It does not replace a doctor, obviously, but it gives you a solid starting point.
BMR Calculator
How many calories does your body burn just by existing? Breathing, circulating blood, keeping your temperature stable. That is your Basal Metabolic Rate. The BMR Calculator uses the Mifflin-St Jeor equation, which research considers the most accurate for estimating resting metabolic rate in healthy adults.
But BMR alone is not that useful. What you really want to know is how many calories you need based on how active you are. So the tool also calculates your TDEE (Total Daily Energy Expenditure) across five activity levels, from sedentary to extra active. Whether you are trying to lose weight, gain muscle, or just understand your body better, this is the number that actually matters.
Water Intake Calculator
Everyone says drink more water. Nobody says how much. The Water Intake Calculator gives you a personalized answer based on your weight, activity level, and climate. Because living in Arizona in July and living in Oslo in December are very different things.
The calculation follows guidelines from the National Academies of Sciences. You get your result in milliliters and in glasses. Simple.
Security
Three tools for encryption, hashing, and password analysis. All of them process everything locally using the Web Crypto API. Your passwords and sensitive text never touch a server.
Caesar Cipher
The Caesar Cipher is one of the oldest encryption methods in history. Julius Caesar used it. Our implementation lets you encrypt and decrypt text with a customizable shift between 1 and 25 positions. Type your message, pick a shift, done.
This is primarily an educational tool. If you are learning cryptography, teaching a class, or building an escape room puzzle, the Caesar cipher is the perfect starting point. It helps you understand the fundamental concept behind all encryption: transforming readable text into something that requires a key to decode. The tool works both ways, so you can also paste encrypted text and recover the original.
Hash Generator
The Hash Generator converts any text into a cryptographic hash. MD5, SHA-1, SHA-256, SHA-512. Paste your text, pick the algorithm, copy the result.
Why does this matter? Hashes are everywhere in software development. File integrity verification, password storage, checksums for deployments, content-addressable identifiers. The tool uses the browser's Web Crypto API, standards-compliant, no external dependencies. For reference, NIST recommends SHA-256 or higher for anything security-related. And yes, SHA-256 is the same hash function that powers Bitcoin and Git.
Password Strength Tester
Is your password actually good? Most password checkers just say "weak" or "strong" and leave it at that. The Password Strength Tester goes deeper. It calculates actual entropy in bits, detects patterns like "123456", "qwerty", repeated characters, keyboard walks, and gives you specific feedback on what to fix.
It also shows you how long an attacker would take to crack your password with different methods. That puts things in perspective fast. The tool follows the NIST SP 800-63B guidelines, which recommend checking passwords against lists of commonly compromised ones rather than imposing arbitrary complexity rules. Your password never leaves your browser.
Design and CSS
Adjusting CSS properties by hand is tedious. You change a value, reload, check, change again. These three tools give you visual editors that generate clean, production-ready CSS code in real time.
CSS Border Radius Generator
The CSS Border Radius Generator lets you adjust each corner independently. Move the controls, see the shape change in the preview, copy the CSS. It supports the full border-radius syntax including the slash notation for organic and asymmetric shapes.
Try creating border-radius: 10px 30px 50px 10px by guessing values in DevTools. It is nearly impossible to visualize. With this tool you see the shape in real time as you drag each corner. Buttons, cards, blob shapes. You adjust visually and take the exact code. The property is documented on MDN.
CSS Box Shadow Generator
Good shadows make interfaces feel alive. The CSS Box Shadow Generator lets you build layered shadow effects with full control over offset, blur, spread, color, and opacity for each layer independently.
The real power is in stacking multiple shadows. That is how professional designers create those subtle depth effects you see in modern UI components, as described in Material Design's elevation system. Every change updates the preview in real time, and the CSS is ready to copy with one click. Inner shadows with inset are supported too.
CSS Gradient Generator
The CSS Gradient Generator handles linear, radial, and conic gradients. You add color stops, adjust positions and angles, and watch the result update live. Full transparency support, unlimited color stops, all gradient types from the CSS Images Module Level 3 spec.
Linear gradients are the obvious ones. Radial gradients give you spotlight effects and backgrounds. Conic gradients unlock pie chart patterns and color wheels without needing SVG. Having all three in one place means you stop jumping between different tools.
Everyday Calculators
Three tools for math you do not want to do in your head. No apps to install. No ads.
Electricity Cost Calculator
How much does it cost to run the air conditioning all day? The Electricity Cost Calculator tells you. Enter the wattage, daily hours of use, and your electricity rate per kWh. You get the cost daily, weekly, monthly, and yearly.
It is eye-opening. A 2000W space heater running eight hours a day can easily cost over $50 per month. Once you see the numbers, you start thinking differently about which devices stay plugged in.
GPA Calculator
The GPA Calculator computes your cumulative grade point average on the 4.0 scale. Add your courses with their letter grades and credit hours, and the tool does the weighted calculation automatically.
Essential for students applying to international universities, exchange programs, or scholarships with a minimum GPA requirement. It also includes a conversion table for translating other grading systems to the 4.0 scale.
Tip Calculator
The Tip Calculator does what you expect. Enter the bill, pick a tip percentage, get the amount. But where it actually saves you is the bill splitting. Dividing a restaurant check among six people with different tip preferences is the kind of simple math that somehow always turns into a 10-minute discussion.
Preset buttons for common percentages (10%, 15%, 18%, 20%, 25%) and a custom option. Especially handy when you travel somewhere where tipping customs are different from what you are used to.
Your Privacy, Always
All 12 tools share one thing: everything runs in your browser. Your weight, your passwords, your health data, your CSS code. Nothing gets uploaded. No analytics tracking what you type, no cookies following you around, no email required. We think that matters.
They all work offline too, thanks to our Progressive Web App. Bookmark kitmul.com and keep them handy.