About BMI Calculator

What BMI Calculator is

BMI Calculator is a free, browser-based tool for calculating Body Mass Index using the standard adult formula. It supports both metric and imperial units, shows your result on a visual scale, and estimates a healthy weight range based on your height.

What the calculator does

Enter your age, gender, height, and weight, and the calculator computes your BMI instantly — entirely in your browser, with no data sent to a server. It shows your BMI value, your category, where you fall on a visual scale, and an estimated healthy weight range for adults. For anyone under 18, it explains why adult categories don't apply and points toward age- and sex-specific interpretation instead.

Focus on simplicity

The interface avoids unnecessary steps, dense menus, or distracting content. The calculator is front and center, and the supporting information is organized underneath for anyone who wants to understand more about BMI, its categories, and its limitations.

Focus on accessibility

The site is built with semantic HTML, labeled form fields, visible keyboard focus states, and results that don't rely on color alone. It aims to work well with screen readers, keyboard navigation, and a wide range of devices.

Focus on speed

There are no heavy frameworks, large images, or unnecessary scripts. The site is built with plain HTML, CSS, and JavaScript so it loads quickly, even on slower connections or older phones.

Educational purpose

Alongside the calculator, the site includes plain-language explanations of what BMI is, how it's calculated, and — just as importantly — what it can't tell you. BMI is a screening measure, not a diagnosis, and the goal of this site is to present it that way.

Developer

BMI Calculator is developed by Arihant.