Health Calculators

Calculate body surface area (BSA) using Mosteller, DuBois, and Haycock formulas. Essential for accurate medication dosing, chemotherapy calculations, and clinical assessments in healthcare.

Calculate your most fertile days and ovulation date based on menstrual cycle length. Track your fertile window to optimize conception timing or plan natural family planning effectively.

Calculate your pet age in human years using breed-specific and science-based formulas. More accurate than the old 7:1 rule for dogs, with separate calculations for cats, dogs by size, and other pets.

Determine your face shape (Oval, Round, Square, Heart, Diamond) with 4 simple measurements. Find the best glasses frames and hairstyles for your shape.

Calculate your therapy practice productivity and billable utilization rate. Track clinical hours vs administrative time, determine revenue per hour, assess documentation efficiency, and compare against industry benchmarks. Optimize scheduling, reduce administrative burden, and maximize income for therapists, counselors, social workers, and mental health professionals.

Free calories burned calculator for 60+ exercises. Enter your weight, activity type, and duration to calculate exact calories burned. Uses science-backed MET values from the Compendium of Physical Activities.

Calculate your Body Mass Index (BMI) instantly with our easy-to-use calculator. Get personalized health insights, understand weight categories, and track your health journey with professional BMI analysis.

Breastfeeding calorie calculator using Mifflin-St Jeor BMR + lactation energy expenditure (400-500 cal/day exclusive, 200-300 partial, 150 supplemented). Calculate total daily calories (2,300-2,500 typical), macronutrient breakdown (40% carbs/30% protein/30% fat), hydration needs (128 oz/day exclusive, 100 oz partial), meal distribution (6 small meals), activity impact, safe weight loss limits (300 cal deficit max, 1,800 minimum intake), galactagogue foods (oatmeal/fenugreek), and CDC/WHO postpartum nutrition guidelines (B12 2.8mcg, iron 9-10mg, calcium 1,000mg, DHA 200-300mg).

Calculate total healthcare costs including deductible, coinsurance, and out-of-pocket maximum. Estimate annual expenses, ACA premium subsidies (100-400% FPL), and HSA eligibility (HDHP requirements). Compare Bronze/Silver/Gold/Platinum plans, determine insurance vs patient payment split, and analyze low/moderate/high usage scenarios. Based on 2025 ACA limits ($9,450 individual / $18,900 family OOP max) and IRS HDHP requirements ($1,600/$3,200 min deductible).

Calculate Medicare Part B and Part D late enrollment penalties for 2025. Estimate lifetime penalty amounts based on months delayed past initial enrollment period. Determine if you qualify for penalty-free enrollment through creditable coverage, employer insurance, or special enrollment periods. Avoid costly mistakes with accurate penalty projections and enrollment deadline reminders.

Calculate when you reach your annual out-of-pocket maximum and understand total healthcare costs. Analyze ACA-compliant limits ($9,450 individual / $18,900 family for 2025), cost breakdown (premiums + deductible + coinsurance), and plan comparison (Bronze/Silver/Gold/Platinum metal tiers). Determine OOP max protection value, scenario analysis (low/moderate/high usage), and optimal plan selection based on expected medical expenses. Includes family vs individual OOP rules and mid-year plan change implications.

Calculate optimal protein intake for muscle building based on body weight, training intensity, and goals. Determine daily protein needs (0.8-1.2g per lb bodyweight), meal timing strategies, and best protein sources for maximum hypertrophy and strength gains in 2025.

Calculate sauna calories burned with accurate MET-based formula. Compare traditional Finnish sauna, infrared sauna, and steam room calorie burn (50-150 kcal per 30 minutes). Understand water weight vs fat loss reality.

Calculate sleep debt accumulated from insufficient sleep. Track daily sleep deficits (7-9 hours recommended), estimate total sleep debt over weeks, plan recovery schedules with weekend catch-up sleep, understand cognitive/health impacts of chronic debt, and optimize repayment strategies for 2025.

Calculate Total Daily Energy Expenditure (TDEE) based on BMR, activity level, and exercise frequency. Get personalized calorie targets for weight loss, maintenance, or muscle gain. Compare Mifflin-St Jeor and Harris-Benedict formulas with accurate macronutrient recommendations for 2025.

Calculate daily water intake based on body weight, activity level, and climate. Get personalized hydration goals in ounces or liters. Adjust for exercise, pregnancy, breastfeeding, and high temperatures. Track optimal fluid intake for health and performance in 2025.

Calculate your daily calorie needs based on age, gender, height, weight, and activity level. Get personalized targets for weight loss, maintenance, or muscle gain using the Mifflin-St Jeor equation.

Calculate your intermittent fasting schedule with eating and fasting windows. Choose from 16:8, 18:6, 20:4, or custom protocols based on your goals, daily routine, and caloric needs.

Free Medicare IRMAA calculator for 2025. Estimate your Part B and Part D income-related monthly adjustment amounts based on MAGI and filing status.

Free protein calculator: find your daily protein intake based on weight, activity level, and fitness goal. Includes per-meal breakdown and top food sources.

Estimate basal metabolic rate with this free BMR calculator using age, sex, height, and weight, then compare your BMR with maintenance calorie needs.

Calculate calories and daily protein, carbs, and fat grams with this free macros calculator using body stats, activity level, goal, and split presets.