How-To Guides
Step-by-step guides that teach you how to perform calculations manually.
How to Calculate Your Immune Strength Score: Step-by-Step Guide
Manually calculate your Immune Strength Score based on sleep, nutrition, and exercise. Understand the formula, worked examples, and common pitfalls.
Read guideHow to Calculate Your Cortisol Risk Score: Step-by-Step Guide
Assess your chronic cortisol and adrenal stress risk. Learn to manually calculate your score based on sleep, diet, and stress factors.
Read guideHow to Calculate Your Athletic Recovery Score: Step-by-Step Guide
Manually calculate your athletic recovery score using sleep, HRV, RHR, and soreness. Understand the formula, worked examples, and training recommendations.
Read guideHow to Calculate Back Pain Risk: Step-by-Step Guide
Learn to manually calculate your lower back pain risk based on posture, lifting habits, and core strength. Understand the formula and key factors.
Read guideHow to Calculate Your Metabolic Age: Step-by-Step Guide
Learn to calculate your metabolic age by hand. Understand BMR, apply the Mifflin-St Jeor formula, and compare to age-group averages. Includes examples and pitfalls.
Read guideHow to Calculate Your Gut Health Score: Step-by-Step Guide
Manually calculate your gut health score based on fiber intake and lifestyle factors. Understand the formula, common pitfalls, and interpret your results.
Read guideHow to Calculate Your Daily Macros: Step-by-Step Guide
Learn to manually calculate your daily macronutrient targets (protein, fat, carbs) for weight loss, gain, or maintenance with this step-by-step guide.
Read guideHow to Calculate Dehydration Level: Step-by-Step Guide
Learn to manually calculate dehydration level using weight loss and simple formulas. Understand symptoms, rehydration needs, and common pitfalls in this guide.
Read guideHow to Calculate Pregnancy Nutrition Targets: Step-by-Step Guide
Calculate daily calorie and nutrient targets for each trimester of pregnancy manually. Understand the formulas and make informed dietary choices.
Read guideHow to Calculate Your Longevity Score: Step-by-Step Guide
Learn to manually calculate your longevity score based on diet, exercise, sleep, and lifestyle habits. Understand the formula and improve your health.
Read guideHow to Calculate Eye Strain Score: Step-by-Step Guide
Manually calculate your digital eye strain risk based on daily screen hours and break frequency. Understand the formula and the 20-20-20 rule.
Read guideHow to Calculate Hearing Loss Risk from Noise Exposure: Step-by-Step Guide
Learn to manually calculate hearing loss risk from noise exposure using dB levels and duration. Understand safe limits, cumulative damage, and common pitfalls.
Read guideHow to Calculate Dementia Risk: Step-by-Step Guide
Learn to manually calculate dementia risk using age, APOE status, and lifestyle factors with our step-by-step guide and a simplified formula.
Read guideHow to Calculate Your Inflammatory Diet Score: Step-by-Step Guide
Learn to manually calculate your Inflammatory Diet Score. Understand the formula, apply it with a worked example, and identify key dietary impacts.
Read guideHow to Calculate Blue Light Exposure: Step-by-Step Guide
Estimate daily blue light exposure manually
Read guideHow to Calculate Posture Risk: Step-by-Step Guide
Assess musculoskeletal risk from daily sitting habits
Read guideHow to Calculate Calories Burned Running: Step-by-Step Guide
Calculate calories burned running manually
Read guideDaily Water Intake Calculator: A Step-by-Step Guide
Calculate your daily hydration goal manually
Read guideHow to Calculate Your Heart Rate: A Step-by-Step Guide
Calculate heart rate manually
Read guideHow to Calculate Recommended Pregnancy Weight Gain: Step-by-Step Guide
Calculate pregnancy weight gain
Read guideHow to Calculate Your One Rep Max: A Step-by-Step Guide
Calculate one rep max manually
Read guideHow to Calculate Calorie Cycling: Step-by-Step Guide
Calculate calorie cycling manually
Read guideHow to Apply the Kleiber Law: Step-by-Step Guide
Calculate metabolic rate
Read guideEstimating VO2max from Daily Step Count: A Step-by-Step Guide
Calculate VO2max manually from steps
Read guideHow to Calculate Lactate Threshold: Step-by-Step Guide
Calculate lactate threshold manually
Read guideSkin Age Estimator: A Step-by-Step Guide
Estimate skin age from lifestyle factors
Read guideHow to Calculate Your Hearing Age: A Step-by-Step Guide
Estimate hearing age from highest frequency
Read guideHow to Calculate Waist-to-Height Ratio: Step-by-Step Guide
Calculate waist-to-height ratio manually
Read guideHow to Calculate Grip Strength: Step-by-Step Guide
Calculate grip strength manually
Read guideHow to Calculate Lung Age: Step-by-Step Guide
Estimate lung age from FEV1 measurement
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