I Built a Free BMI, BMR, Calorie & Ideal Weight Calculator Using React and Tailwind CSS

As a student developer passionate about health tech and web development, I wanted to build something useful for everyday users.

So I created TheFitCalculator — a free online tool to calculate BMI, BMR, daily calorie needs, and ideal weight instantly.

👉 Try it here: https://thefitcalculator.com

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💡 Why I Built This

My goal was simple:

• Fast calculations
• Clean UI
• No data storage
• Fully browser-based processing

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🛠️ Tech Stack

I built this project using:

• React.js for component-based UI
• Tailwind CSS for responsive design
• JavaScript for calculation logic
• Vercel for deployment

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✨ Features

✅ BMI Calculator with health category

✅ BMR Calculator using standard formulas

✅ Daily calorie needs estimator

✅ Ideal weight calculator

✅ Dark mode support

✅ Mobile responsive design

You can explore the calculators here:

• BMI Calculator → https://thefitcalculator.com/bmi-calculator
• BMR Calculator → https://thefitcalculator.com/bmr-calculator
• Calorie Calculator → https://thefitcalculator.com/calorie-calculator
• Ideal Weight Calculator → https://thefitcalculator.com/ideal-weight-calculator

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🚀 Future Improvements

I plan to add:

• Body fat calculator
• Water intake calculator
• Fitness blog section
• PWA support

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🤝 Feedback Welcome

I’d love feedback from the dev community to improve this project.

👉 Check it out: https://thefitcalculator.com

👉 GitHub repo: https://github.com/swetasingh8844/HealthCalc

Thanks for reading!

Comments

[Ahmad Arafa]

Amazing build, I’ll use it.

[Sweta Singh]

Thanks a lot! I hope you find it useful.