Health Calculators
Calculate BMI, calories, and health metrics
67 calculators in this category
BMI Calculator
Check your BMI and see which weight category you fall into based on WHO standards. View health ranges, get personal recommendations, and track your metrics.
Calorie Calculator
Find out how many calories you need each day for weight loss, maintenance, or muscle gain. Personalized TDEE results using the Mifflin-St Jeor equation.
TDEE Calculator
Find out how many calories you burn each day with a TDEE calculation. Enter your stats to get maintenance, weight loss, and muscle gain calorie targets.
Ideal Weight Calculator
Look up your ideal body weight using Devine, Robinson, Miller, and Hamwi formulas. Compare results across all four clinical equations in a single report.
BMR Calculator
Find out how many calories your body burns at rest with the Mifflin-St Jeor equation. Enter age, weight, and height to see your BMR and daily targets.
Waist-to-Height Ratio Calculator
Measure your waist-to-height ratio to assess central obesity and cardiovascular risk. Enter waist and height for an instant WHtR score with health category.
Body Roundness Index (BRI) Calculator
Calculate your Body Roundness Index from height and waist circumference. BRI assesses body shape and visceral fat risk more accurately than BMI alone.
Sleep Calculator
Pick the best bedtime or wake-up time based on 90-minute sleep cycles. Align your schedule to complete full cycles and wake up feeling refreshed every day.
Water Intake Calculator
Find out how much water you should drink each day based on your weight, activity level, and climate. See totals in ounces, liters, and cups per hour breakdown.
Macro Calculator
Calculate your optimal daily macros (protein, carbs, fat) based on your goals - weight loss, maintenance, or muscle gain. Get personalized macro ratios.
Pregnancy Due Date Calculator
Enter your last period date to estimate your due date, trimester timeline, and key milestones. Track your pregnancy week by week from LMP or conception.
Heart Rate Zones Calculator
Enter your age and resting heart rate to see all five training zones with BPM ranges. Uses the Karvonen method for accurate personalized zone calculations.
Body Surface Area Calculator
Enter your height and weight to calculate body surface area using Mosteller, Du Bois, or Haycock formulas. Commonly used for accurate medication dosing.
Ovulation Calculator
Calculate your ovulation date and fertile window based on your menstrual cycle. Track your most fertile days for conception planning or natural family planning.
Calories Burned Calculator
Select an activity, enter your weight and duration, and see exactly how many calories you burned. Covers running, walking, cycling, swimming, and more.
Running Pace Calculator
Enter your race distance and finish time to calculate pace per km, pace per mile, and projected race finish times for 5K through full marathon distances.
VO2 Max Calculator
Estimate your VO2 max from resting and maximum heart rate. See your cardiovascular fitness level and how it compares to age-based benchmarks for your group.
Resting Heart Rate Calculator
Assess your resting heart rate to gauge cardiovascular fitness. Enter your RHR and age to see exactly where you rank, from athlete to above-average range.
Body Fat Percentage Calculator
Measure your body fat percentage using the US Navy method. Enter your waist, neck, hip, and height measurements to see fat mass, lean mass, and fitness level.
Protein Intake Calculator
How much protein do you need per day? Enter your weight, activity level, and goal to get a daily gram target for muscle gain, fat loss, or maintenance.
Carbohydrate Calculator
Figure out how many carbs you should eat per day. Set your calories, protein, and fat, then auto-calculate remaining carbs or pick a target percentage.
Fat Intake Calculator
Work out your daily fat intake in grams. Enter total calories, protein, and carbs to auto-calculate fat, or set a target percentage with saturated fat limits.
Meal Planner Calculator
Split your daily calories and macros across 3, 4, or 5 meals. See per-meal protein, carbs, fat, and calorie targets with balanced distribution ratios.
Macro Split Calculator
Choose a protein, carb, and fat ratio then convert percentages to daily grams. Compare popular splits like 30/40/30 or 40/35/25 for your calorie target.
Due Date Calculator
When is your baby due? Enter your last period or conception date to get an estimated due date, trimester timeline, and key pregnancy milestones week by week.
BAC Calculator
Estimate your blood alcohol content from drinks consumed, body weight, gender, and time elapsed. See when BAC drops below the legal limit and sober time.
Implantation Calculator
Estimate when implantation may occur based on your last menstrual period and average cycle length. See the 6-12 DPO window and earliest pregnancy test date.
Conception Calculator
Work backward from a due date or forward from your last period to find when conception likely happened. See the fertile window and estimated due date.
Blood Type Calculator
Predict a child's possible blood type from both parents. See ABO and Rh factor probabilities based on Mendelian genetics with detailed inheritance charts.
Macro Calculator for Weight Loss
Set your calorie deficit and get protein, carb, and fat targets tuned for fat loss. Adjusts macros to preserve muscle while cutting with IIFYM flexibility.
Caffeine Half-Life Calculator
Calculate how long caffeine stays in your system. Enter your dose, age, and sensitivity to find when you can sleep after coffee, tea, or energy drinks.
Sleep Debt Calculator
Calculate your accumulated sleep debt and get a personalized recovery plan. Track weekly sleep deficit and learn how to restore healthy sleep patterns.
Pet Calorie Calculator
Find out how many calories your dog or cat needs each day. Enter pet weight, age, and activity level to get daily feeding amounts in cups, grams, and kcal.
Bike Gear Ratio Calculator
Enter your chainring, cog, and wheel size to calculate gear ratio, development, and speed at any cadence. Compare road, gravel, and MTB gearing setups.
Dosage Calculator
Calculate medication dosages by patient weight, IV drip rates in gtt/min, and nursing unit conversions. Covers mg/kg dosing, pediatric doses, and mL/hr.
Stride Length Calculator — Steps per Mile & Walking Distance
Calculate your walking and running stride length from height and gender. Get steps per mile, steps per kilometer, and distance covered in 10,000 steps.
Sweat Rate Calculator — Fluid Loss & Hydration Needs During Exercise
Calculate your sweat rate during exercise from pre/post body weight and fluid intake. Get personalized hydration and sodium replacement recommendations.
Blood Pressure Calculator
Check your blood pressure classification per AHA/ACC 2017 guidelines. Calculate MAP, pulse pressure, risk level, and get personalized recommendations.
Heart Rate Recovery Calculator
Calculate your heart rate recovery score after exercise to assess cardiovascular fitness. Compare HRR results by age, gender, and fitness level instantly.
Hearing Loss Risk Calculator
Estimate your noise exposure risk and safe listening time by decibel level. Calculate cumulative hearing damage risk from concerts, headphones, and work noise.
Creatine Dosage Calculator
Calculate your optimal creatine loading and maintenance dose based on body weight and activity level. Get personalized daily creatine dosage in grams.
Muscle Gain Rate Calculator
Estimate your natural muscle gain potential by training experience, age, and gender. Uses Alan Aragon and Lyle McDonald models for realistic projections.
Push-Up Test Calculator
Score your push-up fitness test by age and gender using ACSM norms. Get your rating from Excellent to Poor with percentile ranking and improvement goals.
Hiking Pace Calculator
Estimate your hiking time with Naismith's Rule. Enter trail distance, elevation gain, fitness level, and pack weight to get accurate pace and time estimates.
Calorie Burn Hike Calculator
Calculate calories burned hiking based on body weight, duration, terrain, elevation gain, and pack weight. Uses MET values adjusted for real trail conditions.
Water Needs Hike Calculator
Calculate how much water to carry on your next hike. Enter duration, body weight, intensity, and temperature to get personalized hydration recommendations.
Trail Food Calorie Calculator
Plan trail food calories for backpacking trips. Enter body weight, trip days, and activity level to get daily calorie targets and total food weight needed.
Altitude Acclimatization Calculator
Plan a safe altitude acclimatization schedule. Enter start and target elevation, daily ascent rate, and rest day intervals to generate a day-by-day plan.
Cycling Gear Inch Calculator
Calculate cycling gear inches, gain ratio, and cadence-to-speed from chainring, cog, and wheel size. Compare gear ratios for road, MTB, and gravel bikes.
Bike Fit Calculator
Calculate your ideal bike frame size, saddle height, reach, and stem length from body measurements. Sizing for road, mountain, hybrid, and gravel bikes.
Swim Pace Calculator
Calculate swim pace per 100m/yd, split times, and Critical Swim Speed (CSS). Enter your distance and time to get pace breakdowns for pool and open water.
UV Exposure Calculator
Calculate time to sunburn by UV index, skin type, SPF, and altitude. Get safe sun exposure times and sunscreen reapplication reminders for any conditions.
Trail Running Pace Calculator
Calculate your grade-adjusted trail running pace based on elevation gain, terrain difficulty, and altitude. Convert flat road pace to realistic trail times.
Race Nutrition Calculator
Plan your race-day nutrition strategy with carbs per hour, hydration needs, electrolytes, and gel timing based on race duration, intensity, and weather.
Ruck Pace & Calorie Calculator
Calculate ruck march pace and calorie burn based on pack weight, body weight, distance, and terrain. Plan rucking workouts with accurate time estimates.
Baby Formula Calculator
Calculate daily formula needs by baby weight and age. Get exact ounces per feed, scoops per day, can duration, and monthly cost estimates for infant formula.
Diaper Cost Calculator
Calculate total diaper costs from birth to potty training. Compare disposable vs cloth diapers side by side and see how much you can save with reusable options.
Baby Sleep Schedule Calculator
Build an age-appropriate sleep schedule for your baby. Calculate recommended total sleep hours, optimal wake windows, nap times, and ideal bedtime by age.
Child Growth Percentile Calculator
Calculate your child's height and weight percentiles using WHO/CDC growth charts. Get Z-scores, median comparisons, and see how your child tracks over time.
Baby Food Cost Calculator
Compare store-bought vs homemade baby food costs month by month. Calculate food expenses by age, meals per day, and see your potential savings over time.
Child Height Predictor Calculator
Predict your child's adult height using the mid-parent and Khamis-Roche methods. Enter parent heights and child's current measurements for a range estimate.
529 College Savings Calculator
Calculate your 529 plan growth with monthly contributions, tax-free compounding, and state tax deductions. See if your savings will cover college costs.
Child Care Cost Calculator
Estimate annual child care costs by type and calculate your income percentage. Find your Child and Dependent Care Tax Credit at 20-35% of qualified expenses.
Birthday Party Budget Calculator
Plan your birthday party budget with venue, food, cake, decorations, favors, and entertainment costs. Calculate total spending and per-guest cost breakdown.
Family Meal Planner Calculator
Calculate your weekly family grocery budget with age-based portion multipliers. Toddlers eat 0.5x, teens 1.2x adult portions. Plan meals and save money.
Screen Time Calculator
Track daily and weekly screen time against AAP guidelines by age. Compare actual usage to recommended limits and see yearly totals in hours and full days.
Kids Allowance Calculator
Calculate age-appropriate allowance at $0.50-$1.00 per year of age. Set savings, spending, and giving splits, then see compound growth over 5-10 years.