Health & Wellness Guides
Understand the numbers behind your health with our evidence-based guides. From calculating your BMI and understanding what it means to tracking macronutrients for your fitness goals, each article explains the science in clear, accessible language. Every guide is paired with our free health calculators so you can apply the formulas to your own measurements.
Our health content references authoritative sources including the CDC, WHO, NIH, and peer-reviewed medical research. We use inclusive, non-judgmental language and clearly note when professional medical guidance is recommended.
All Health Articles (25)
How to Calculate BMI and What It Really Means
Calculate your Body Mass Index using the standard formula, understand BMI categories, and learn why BMI alone does not fully represent your health status.
Understanding BMR and TDEE: Your Metabolism Explained
Learn how to calculate your Basal Metabolic Rate and Total Daily Energy Expenditure with proven formulas to understand your metabolism and calorie needs.
How to Count Calories for Weight Loss: A Scientific Approach
Master calorie counting for weight loss with evidence-based methods, portion estimation tips, and practical meal planning strategies for your daily routine.
Macronutrients Explained: Protein, Carbs, and Fat Ratios
Understand optimal macronutrient ratios for weight loss, muscle gain, and maintenance with science-backed recommendations and practical tracking methods.
Body Fat Percentage: How to Measure and Interpret
Discover how to measure body fat percentage using skinfold calipers, bioelectrical impedance, and estimation formulas with healthy ranges by age and gender.
How to Calculate Your Ideal Weight
Find your ideal body weight using clinical formulas including Devine, Robinson, Miller, and Hamwi methods with side-by-side comparisons and interpretation.
How Pregnancy Due Date Calculations Work
Calculate your pregnancy due date using Naegele's rule and ultrasound dating, understand trimester timelines, and learn what can shift your delivery date.
How to Calculate Your Target Heart Rate Zone
Calculate your target heart rate zone for exercise using age-based and Karvonen formulas with training zone charts for fat burning and cardio conditioning.
How Much Water Do You Really Need Daily?
Find your optimal daily water intake based on body weight, activity level, and climate with evidence-based guidelines beyond the generic eight-glasses rule.
Understanding Blood Alcohol Content (BAC)
Learn how blood alcohol content is calculated from drinks, body weight, gender, and time with BAC level charts showing impairment stages and legal limits.
How to Interpret Blood Pressure Readings
Understand systolic and diastolic blood pressure numbers, what normal and elevated readings mean, and lifestyle changes to improve cardiovascular health.
Calorie Deficit Explained: The Science of Weight Loss
Understand the science behind calorie deficits including how to calculate your ideal deficit, avoid metabolic adaptation, and lose weight sustainably.
How to Calculate One-Rep Max for Strength Training
Calculate your one-rep max using Epley, Brzycki, and Lombardi formulas to plan progressive overload, set training percentages, and track strength gains.
Understanding GFR and Kidney Function
Learn what glomerular filtration rate measures about kidney function, how GFR is calculated from creatinine levels, and what different GFR stages indicate.
Ovulation and Fertility Window: How to Calculate
Calculate your ovulation date and fertile window based on cycle length with calendar tracking, basal temperature, and cervical mucus observation methods.
How to Calculate Body Surface Area (BSA)
Calculate body surface area using Du Bois, Mosteller, and Haycock formulas with clinical uses in drug dosing, burn assessment, and metabolic estimates.
Waist-to-Hip Ratio: What Your Measurements Tell You
Calculate your waist-to-hip ratio correctly and learn what it reveals about visceral fat distribution, cardiovascular risk, and metabolic health status.
Pediatric Growth Charts Explained
Understand how pediatric growth charts track height, weight, and head circumference percentiles from birth through adolescence and what the numbers mean.
How Smoking Affects Life Expectancy
Discover the quantified impact of smoking on life expectancy with research-backed statistics, dose-response data, and the measurable benefits of quitting.
Understanding Lean Body Mass and Why It Matters
Learn what lean body mass is, how to calculate it using multiple formulas, and why tracking LBM is more useful than total weight for fitness and health.
How to Calculate Protein Needs for Muscle Gain
Calculate daily protein requirements for muscle building based on body weight, training intensity, and goals with food source and timing recommendations.
How Sleep Cycles Work and Why They Matter
Understand the four stages of sleep cycles, calculate optimal bedtimes and wake times, and apply evidence-based strategies to improve your sleep quality.
How to Track Pregnancy Week by Week
Learn how to track pregnancy progression week by week with fetal development milestones, maternal changes, and important prenatal checkpoints each trimester.
Understanding Baby Weight Percentiles
Learn how to read baby weight percentile charts, what different percentiles mean for infant growth, and when to discuss concerns with your pediatrician.
Understanding Creatinine Clearance and Kidney Health
Understand how creatinine clearance tests measure kidney function using the Cockcroft-Gault equation with reference ranges and interpretation guidelines.
Frequently Asked Questions
Our health guides cover body metrics like BMI and body fat percentage, nutrition topics including calorie counting and macronutrient ratios, pregnancy tracking and fertility, fitness calculations like one-rep max and target heart rate, and medical metrics such as GFR and creatinine clearance. Each guide explains the science in accessible language.
Our health content is carefully researched and references authoritative medical sources including the CDC, WHO, NIH, and peer-reviewed medical literature. While our guides are educational, they are not a substitute for professional medical advice. Always consult your healthcare provider for medical decisions.
Our calculators use well-established medical formulas such as the Mifflin-St Jeor equation for BMR, the Harris-Benedict formula for TDEE, and WHO-standard BMI categories. We clearly explain the limitations of each formula and when professional guidance is recommended.
Yes, all health and wellness guides on CalculatorGlobe are completely free with no signup or subscription required. We believe everyone deserves access to clear, evidence-based health information.
We review health content regularly to reflect the latest clinical guidelines and research. When major health organizations update their recommendations, we update our guides to ensure accuracy.
Disclaimer: This calculator is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare professional for medical guidance.
Last updated: February 23, 2026