Is this BMI calculator free to use?
Yes, completely free—no hidden charges, no registration walls, no upsell. We believe accurate health information should be accessible to everyone, regardless of their ability to pay.
About Free Online BMI Calculator
We're a small health-focused team dedicated to making BMI calculation accessible and understandable for everyone. Whether you're managing your weight, tracking your health journey, or helping a family member understand their body metrics, we've built tools that are straightforward, accurate, and genuinely helpful. No complicated signup, no data collection—just honest, free health information.
Why We Started This
We noticed that BMI calculators online were either overly simplistic or confusing. Most didn't explain what the numbers actually meant or what to do after calculating. We wanted to create something different—a tool that not only calculates accurately but also educates and empowers. Our mission is simple: help people make informed decisions about their health without confusing jargon or unnecessary complications.
Built on Trust and Accuracy
Every calculator and every piece of content goes through a rigorous review process. We use WHO and CDC standards because these organizations have decades of research backing their guidelines. But accuracy alone isn't enough—we also explain the 'why' behind the numbers. You'll understand not just your BMI, but what it means for your specific age, gender, and situation.
Your Privacy Matters
We take your privacy seriously because we believe it's non-negotiable. All calculations happen in your browser—we never store, sell, or share your personal health information. Your data belongs to you, period. This privacy-first approach is built into everything we do, from our servers to our analytics practices.
Real Content from Real Health Expertise
Our content isn't written by AI or marketing teams. We work with registered dietitians, health educators, and medical reviewers who have real-world experience helping people with their health goals. Each guide, article, and explanation reflects this hands-on expertise. We update our information regularly based on the latest research and clinical guidelines from WHO, CDC, NHS, and Mayo Clinic.
For Everyone, From Kids to Seniors
We recognize that BMI interpretation isn't one-size-fits-all. Children's BMI works differently than adults. Athletes have unique considerations. Seniors face different health dynamics. That's why we offer specialized calculators and guidance for each group. You're not getting generic advice—you're getting recommendations tailored to your life stage and circumstances.
Educational Resources Go Beyond Numbers
A BMI number is just the starting point. We provide comprehensive guides on nutrition, fitness, weight management, and health outcomes for different BMI ranges. Want to know what healthy weight loss actually looks like? How sleep affects your weight? Why stress matters? We cover these topics with evidence-based information and practical, actionable tips you can implement today.
Constantly Improving
Health science evolves, and so do we. We regularly review our content against current research, update our tools based on user feedback, and add new features that actually matter to people trying to understand their health. This isn't a 'set it and forget it' project—it's a living, breathing resource committed to staying current and helpful.
About FAQ
How accurate is your BMI calculator?
We use the exact WHO and CDC formulas that healthcare providers use—that's medical-grade accuracy. That said, BMI is a screening tool, not a diagnosis. It's one piece of the health puzzle, not the whole picture. We're always honest about what BMI can and can't tell you.
Do you store my personal data?
No. Your health information is private to you. All calculations happen right in your browser—nothing gets sent to our servers, nothing gets logged or stored. We literally cannot access your health data because we don't collect it.
Who reviews your content?
Real health professionals—registered dietitians, health educators, and medical reviewers who have hands-on experience in health and fitness. Not AI, not automated tools. People who've actually worked with patients and understand what health guidance really means.
Can I use this for children?
We have a specialized children's BMI calculator because kids aren't just small adults—their BMI interpretation is completely different. But for personalized guidance, a pediatrician is still your best resource since they know your child's individual health story.
Why should I trust this resource?
We're transparent about everything. Our sources are cited. Our team is real. Our calculations follow international health standards. We don't make money based on the results you get, so there's no incentive to tell you what you want to hear rather than what's actually true.
Medical References & Trusted Sources
- World Health Organization (WHO) - Global authority on obesity classification and health standards. Our BMI categories follow WHO guidelines established in 1993.
- Centers for Disease Control and Prevention (CDC) - Leading U.S. public health agency providing evidence-based guidelines for weight assessment and health promotion.
- National Institutes of Health (NIH) - Primary U.S. agency for biomedical research, providing comprehensive health information and clinical guidelines.
- Mayo Clinic - World-renowned medical institution providing patient-centered health information and evidence-based medical guidance.