Health, Fitness & Metabolic Calculators

Official WHO metric and imperial weight category index

Daily calories for fat loss, muscle gain & macro splits

Calculate min/mile and min/km splits for 5K to 26.2 marathons

Estimated delivery date and gestational development calendar

Track clean days, health milestones & financial savings

Estimate detox, inpatient, and outpatient recovery expenses

Calculate body fat percentage and fat vs lean mass using circumference measurements

Calculate resting daily calories burned at complete physical rest

Compare ideal body weight estimates using Devine, Robinson, and Miller formulas

Calculate lean tissue weight and fat mass using Boer and James equations

Calculate estimated ovulation day, fertile window, and next menstrual cycle

Estimate the conception date and fertile window from your due date

Predict your next 3 menstrual periods and PMS symptom phases

Track healthy gestational weight gain guidelines by trimester

Calculate 1RM strength and training percentage percentages across Brzycki, Epley, and Lombardi formulas

Calculate aerobic, anaerobic, and VO2 max heart rate zones using the Karvonen method

Calculate estimated blood alcohol concentration and sober-up timeline using Widmark's formula

Calculate daily protein, carbohydrate, and fat targets for cutting, bulking, or maintaining

Calculate optimal protein intake in grams for muscle building, endurance, or fat loss

Estimate recommended daily fluid intake based on body mass, physical activity, and ambient climate

Determine body frame shape and Waist-to-Hip Ratio (WHR) health risk

Calculate calories burned across 20+ sports using Metabolic Equivalent (MET) scores

Calculate eating and fasting windows for 16:8, 18:6, 20:4, and OMAD diets

Calculate estimated Glomerular Filtration Rate (eGFR) and kidney disease staging

Calculate remaining caffeine in your bloodstream and optimal cutoff time for sleep

Calculate optimal wake-up times and bedtimes based on 90-minute REM cycles

Calculate Total Daily Energy Expenditure (TDEE) and grams of protein, carbs, and fats

Calculate daily creatine loading phase doses (split into 4) and ongoing 5g maintenance

Calculate estimated peak Blood Alcohol Content (BAC) and hours to legal 0.08% and 0.00% sobriety

Calculate daily hydration in fluid ounces, liters, and water bottle refills based on exercise and heat

Calculate required minute/mile and minute/km pace splits for 5K, 10K, Half Marathon, and Marathon