Weight & BMI Tracking

Monitor body weight and body mass index for cardiovascular health

What are Weight and BMI?

  • Body Weight - Your total body mass in kilograms (kg) or pounds (lbs)
  • BMI (Body Mass Index) - Weight-to-height ratio calculated as weight (kg) / height² (m²)

Example: A person weighing 70 kg at 1.75 m tall has a BMI of 70 / (1.75²) = 22.9 kg/m²

Why Weight and BMI Matter for Cardiovascular Health

  • Excess weight increases cardiovascular disease risk
  • Associated with hypertension, diabetes, and dyslipidemia
  • Weight loss can improve blood pressure and metabolic health
  • Rapid weight changes may indicate fluid retention or other health issues

📊 BMI limitations: BMI doesn't distinguish muscle from fat. Athletes and muscular individuals may have "high" BMI despite being healthy. Discuss your target range with your clinician.

BMI Categories (CDC)

Underweight

<18.5 kg/m²

May indicate malnutrition or underlying health conditions.

Healthy Weight

18.5 - 24.9 kg/m²

Associated with lower cardiovascular disease risk.

Overweight

25.0 - 29.9 kg/m²

Increased health risks. Lifestyle modifications recommended.

Obesity

≥30.0 kg/m²

Significantly increased cardiovascular risk. Medical evaluation recommended.

⚠️ Context matters: BMI is a screening tool, not a diagnostic. Age, sex, muscle mass, and ethnicity affect interpretation. Consult your clinician for personalized targets.

How Cardio Analytics Uses Weight and BMI Data

  • Tracks weight trends - Visualize changes over days, weeks, and months
  • Computes BMI automatically - Using height from HealthKit and current weight
  • Highlights clinically relevant changes - Alerts for rapid weight gain/loss
  • Medication correlations - See how medications (e.g., diuretics, beta blockers) affect weight
  • Blood pressure correlations - Track relationship between weight and BP
  • Write-back to HealthKit - Manual weight entries sync to Apple Health

HealthKit Data Types

Cardio Analytics reads weight data from Apple HealthKit using this identifier:

  • bodyMass - Weight in kilograms (kg) (Apple Docs)
  • height - Height in meters (m), used to calculate BMI

Learn More About HealthKit Integration

Tips for Accurate Weight Tracking

  • Weigh at the same time daily - Morning after using the bathroom, before eating
  • Use the same scale - Different scales can vary by 1-2 kg
  • Minimal clothing - Weigh without shoes for consistency
  • Track trends, not daily fluctuations - Weight varies 0.5-2 kg day-to-day due to water, food, etc.
  • Use a validated scale - Smart scales that sync to HealthKit automate tracking

Track Your Weight & BMI with Cardio Analytics

Monitor body weight and BMI trends with medication and blood pressure correlations.

Download on App Store

Expertly Reviewed by

This content has been written and reviewed by a sports data metrics expert to ensure technical accuracy and adherence to the latest sports science methodologies.

Weight & BMI Tracking - Healthy Range Monitoring

Track body weight and BMI with healthy range indicators. Monitor clinically relevant changes to manage your long-term cardiovascular health.

  • 2025-11-29
  • weight tracking · BMI calculator · body mass index · healthy weight range · obesity monitoring
  • References