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Calculate Body Mass Index (BMI) and health category.
A free, privacy-first online tool to calculate your Body Mass Index and determine your health category based on height and weight directly in your browser.
BMI calculation. Health category. Quick results.
Measurement Unit
Press Enter in a number field to calculate quickly.
Enter your height in centimeters in the Height field (e.g., 175 for 175 cm).
Enter your weight in kilograms in the Weight field (e.g., 70 for 70 kg).
Click the Calculate BMI button to compute your Body Mass Index.
Review your BMI value and the corresponding health category displayed below the result.
The category is color-coded: Underweight (blue), Normal (green), Overweight (yellow), or Obese (red) based on WHO classification.
Pure JavaScript arithmetic and formula evaluation — instant calculations with no backend calls.
Unlike many online tools that require account creation, subscriptions, or impose usage limits after a free trial, BMI Calculator is completely free with no sign-up required. Use it as often as you need without any restrictions or hidden charges. Check out our Age Calculator tool for complementary functionality.
Your files never leave your device. All processing happens locally in your browser using client-side JavaScript, which means zero data transmission to any server. This privacy-first architecture ensures your sensitive documents remain completely confidential. Learn more about Percentage Calculator for similar privacy-focused processing.
Many free online tools add watermarks to output files or display intrusive advertisements. BMI Calculator delivers clean, watermark-free results with no interruption. Our minimalist interface lets you focus on your task without distraction.
Whether you are using a desktop computer, laptop, tablet, or smartphone, BMI Calculator is fully responsive and works seamlessly across all devices and screen sizes. No app installation required – just open your browser and start using the tool instantly. Browse our complete tool collection for more utilities.
1. Enter your height in centimeters in the Height field (e.g., 175 for 175 cm). 2. Enter your weight in kilograms in the Weight field (e.g., 70 for 70 kg). 3. Click the Calculate BMI button to compute your Body Mass Index. 4. Review your BMI value and the corresponding health category displayed below the result. 5. The category is color-coded: Underweight (blue), Normal (green), Overweight (yellow), or Obese (red) based on WHO classification.
Calculators on FreeAIBox include a comprehensive range of options beyond the related tools above. Browse additional tools to find exactly what you need for your document, image, or data processing tasks.
FreeAIBox offers free tools across 9 categories. Browse other categories for additional tools that can complement your workflow and help you accomplish more tasks without switching platforms.
BMI Calculator is a free online tool provided by FreeAIBox. Your files never leave your device – all processing happens locally in your browser with zero server uploads. Unlike cloud-based competitors that transmit your documents to remote servers, this tool runs entirely on your machine using local compute, ensuring complete data privacy and security.
This architecture makes FreeAIBox ideal for enterprise environments with strict data compliance requirements, including GDPR, HIPAA, and corporate IT policies that prohibit uploading sensitive documents to unauthorized cloud services. No data leaves your device – no BAA required, no cross-border data transfer concerns.
For more information on browser-based processing and web standards, visit the MDN Web Docs, web.dev, or W3C HTML Specification.