Key capabilities
- Metric and US measurements
- Sourced categories and equations
- Health inputs are not saved
- Copy or download your estimate
Adult BMI & Calorie Calculator
Calculate adult BMI in metric or US units and optional Mifflin–St Jeor resting and daily energy estimates. Transparent sources and eligibility limits; not medical advice.
ON-DEVICE TOOL
An adult screening reference with an optional energy estimate—not a diagnosis or an eating plan.
Private by design: inputs stay in this browser session. Anonymous operation events contain no values, file names or photo contents.
Please note
For adults 20+ only. BMI does not distinguish muscle from fat or diagnose health; interpretation can differ in older adults and across populations. This estimator is not suitable for pregnancy, breastfeeding or individualized clinical nutrition. Discuss concerns with a qualified clinician.
Your result will appear here
Review the inputs, then calculate. Changing an input clears the previous result.
Assumptions & limits
Rounded Mifflin–St Jeor: REE = 10 × kg + 6.25 × cm − 5 × age + sex coefficient. Daily estimate = REE × activity factor. FAO PAL is defined relative to BMR, so applying it to estimated REE is approximate. These values are not prescribed intake or weight-loss targets.
CDC adult screening thresholds: <18.5; 18.5–<25; 25–<30; 30–<35; 35–<40; ≥40.
About Adult BMI & Calorie Calculator
Understand adult BMI and estimated daily energy needs. Calculate adult BMI in metric or US units and optional Mifflin–St Jeor resting and daily energy estimates. Transparent sources and eligibility limits; not medical advice. The core workflow is designed to run in your current browser.
Useful for
- Understand an adult BMI result
- Explore an activity-based energy estimate
Frequently asked questions
Is Adult BMI & Calorie Calculator free to use online?
Yes. Adult BMI & Calorie Calculator opens in a modern browser and does not require desktop software installation.
What is Adult BMI & Calorie Calculator useful for?
Common use cases include Understand an adult BMI result; Explore an activity-based energy estimate.
Is my input or file uploaded?
The core processing workflow is designed to run locally in the browser. Key capabilities include Metric and US measurements, Sourced categories and equations, Health inputs are not saved; account, comments, and anonymous analytics may still create normal site requests.
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