BMI, BMR & Body Fat Calculator

Advanced BMI, BMR & Body Fat Calculator

What it does

This tool provides separate calculators for Body Mass Index (BMI), Basal Metabolic Rate (BMR), and Body Fat Percentage. Track progress over time with local storage and export data as CSV. Supports metric and imperial units.

Who it's for

Designed for adults (20+ years) assessing weight status, health-conscious individuals tracking body composition, fitness enthusiasts monitoring progress, and researchers/students studying health metrics.

Tool Interface

Advanced Health Calculator

BMI Calculator

Enter your details to calculate BMI and WHtR

Units:

Height (cm)

Weight (kg)

Height (ft)

Height (in)

Weight (lb)

Waist circumference (optional for WHtR)

Measured at narrowest point, usually just above belly button

BMI: –

–

–

Underweight < 18.5

Normal 18.5–24.9

Overweight 25–29.9

Obesity ≥ 30

Healthy weight range (for your height): –

BMI Prime: – (BMI ÷ 25)

Waist-to-Height Ratio (WHtR): – –

Current Inputs: –

Date Calculated: –

BMR Calculator

Enter your details to calculate BMR and daily calorie needs

Units:

Age (years)

Sex Prefer not to say Female Male

Height (cm)

Weight (kg)

Height (ft)

Height (in)

Weight (lb)

Activity Level (for calorie needs) Select level Sedentary (little or no exercise) Lightly active (light exercise/sports 1-3 days/week) Moderately active (moderate exercise/sports 3-5 days/week) Very active (hard exercise/sports 6-7 days a week) Super active (very hard exercise & physical job)

BMR: –

–

Basal Metabolic Rate (BMR): – (Harris-Benedict equation)

Daily Calorie Needs: – (Based on activity level)

Current Inputs: –

Date Calculated: –

Body Fat Calculator

Enter your details to estimate body fat percentage

Units:

Age (years)

Sex Select sex Female Male

Height (cm)

Weight (kg)

Height (ft)

Height (in)

Weight (lb)

Waist circumference

Required; measured at narrowest point

Neck circumference

Required for U.S. Navy method

Hip circumference (for females)

Required for females

Body Fat %: –

–

Estimated Body Fat %: – (U.S. Navy method)

Current Inputs: –

Date Calculated: –

Progress Tracker

No progress data yet. Calculate your metrics and save them to start tracking.

⚠️ Medical Disclaimer: This calculator is for educational purposes only. Results are estimates and should not replace professional medical advice. For ages under 20, use BMI-for-age percentiles. Always consult healthcare professionals for medical decisions.

How to Use

1. Choose Tab: Select BMI, BMR, Body Fat, or Progress Tracker.
2. Select Units: Choose "Metric" or "Imperial" in the selected tab.
3. Enter Details: Input the required details for the selected calculator.
4. Calculate: Click the "Calculate" button in the tab to view results.
5. Track Progress: Use the "Progress Tracker" tab to save and monitor metrics over time.
6. Save or Export: Use "Print / Save PDF" for a record or "Export Data" to download history as CSV.
7. Reset: Click "Reset All" to clear inputs and start over.

Note: Progress data is saved locally in your browser. Use "Clear History" to reset saved data.

Back to tool

Benefits

• Separate Calculators: Dedicated tabs for BMI, BMR, and Body Fat for focused use.
• Unit Flexibility: Switch between metric (kg, cm) and imperial (lb, ft/in) units effortlessly.
• Progress Tracking: Save and monitor metrics with local storage and export as CSV.
• Clear Guidance: Receive categorized results and personalized health advice.
• Privacy: All calculations and data storage occur locally in your browser.

Back to tool

Use Cases

This calculator is versatile for various scenarios:

• Fitness Goals: Track body composition changes during weight loss or muscle gain programs.
• Health Monitoring: Assess risks related to abdominal fat using WHtR and plan calorie intake with BMR.
• Educational Use: Learn about health metrics for academic or research purposes.
• Personal Wellness: Gain insights into weight status and daily calorie needs for informed lifestyle choices.

Back to tool

Frequently Asked Questions (FAQs)

Is this tool suitable for children?

No, this calculator is designed for adults aged 20 and above. For children and teenagers, use BMI-for-age percentiles, which account for growth patterns.

What is Waist-to-Height Ratio (WHtR) and why is it important?

WHtR is your waist circumference divided by your height. It’s a strong indicator of central obesity, linked to higher risks of heart disease, type 2 diabetes, and stroke, often more predictive than BMI alone.

How accurate is the Body Fat % estimate?

The U.S. Navy method provides a rough estimate based on circumference measurements. It’s less accurate than clinical methods like DEXA scans but useful for quick assessments.

Why are neck and hip measurements required for body fat?

Neck circumference is needed for both sexes, while hip circumference is required for females only, as per the U.S. Navy method for estimating body fat percentage.

How is BMR calculated?

BMR is calculated using the Harris-Benedict equation, which estimates your daily energy expenditure at rest based on age, sex, height, and weight.

How are daily calorie needs estimated?

Daily calorie needs are calculated by multiplying your BMR by an activity level multiplier (e.g., 1.2 for sedentary, 1.9 for super active).

Related Content

Explore more analytical tools for research and data analysis:

• Age Calculator
• Descriptive Analysis
• Linear Regression
• Correlation Analysis