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33 calculatorsBMI Calculator
Health & Fitness
Calculate your Body Mass Index and ideal weight range for your height. Features a WHO classification visual gauge with color-coded BMI bands, needle indicator, classification risk table, and medical disclaimer.
★ 4.911K uses
TDEE Calculator
Health & Fitness
Find your maintenance calories in seconds. Uses Mifflin-St Jeor and Katch-McArdle equations with BMR/TEF/EAT/NEAT breakdown. Get your personalized calorie goal for weight loss, gain, or maintenance.
★ 4.918K uses
Due Date Calculator
Health & Fitness
Calculate your estimated due date from LMP, conception date, or IVF transfer date. View current pregnancy week, trimester milestones timeline, and days remaining.
★ 4.946K uses
Pregnancy Calculator
Health & Fitness
Track your pregnancy week by week. Calculate due date, current trimester, gestational age, and key milestones from your last menstrual period.
★ 4.953K uses
BMR Calculator
Health & Fitness
Calculate your Basal Metabolic Rate using Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle formulas. Features a visual formula comparison panel with side-by-side bars.
★ 4.911K uses
Heart Rate Zones
Health & Fitness
Calculate your 5 training heart rate zones using the Karvonen formula or percentage of max HR. Features a visual zones panel with explicit formula display (THR = ((HRmax − HRrest) × %Intensity) + HRrest).
★ 4.952K uses
Water Intake
Health & Fitness
Calculate your recommended daily water intake based on body weight, activity level, and climate. Get your personalized hydration goal in liters, ounces, and cups.
★ 4.924K uses
Body Fat Calculator
Health & Fitness
Calculate your body fat percentage using the U.S. Navy circumference method. Uses neck, abdomen (men), and waist/hip (women) measurements with anatomical measurement guide.
★ 4.946K uses
Ideal Weight Calculator
Health & Fitness
Calculate your ideal body weight using Devine, Robinson, Miller, and Hamwi formulas. Get the average across all four plus healthy BMI range for your height.
★ 4.924K uses
Macro Calculator
Health & Fitness
Calculate your daily macronutrient targets based on TDEE, fitness goal, and diet preference. Supports Standard, Low-Carb, Keto, High-Protein, and Mediterranean splits.
★ 4.925K uses
Pregnancy Weight Gain
Health & Fitness
Track your pregnancy weight gain against IOM guidelines based on pre-pregnancy BMI. See recommended total gain range, weekly targets, and your gain status.
★ 4.937K uses
Conception Calculator
Health & Fitness
Calculate your fertile window, peak fertility days, and estimated ovulation date. Also supports IVF transfer date due date calculation (Day 3 and Day 5 embryos) and target-due-date reverse conception planning. Plan conception timing with probability-based fertile day tracking.
★ 4.930K uses
Pace Calculator
Health & Fitness
Calculate running pace, time, or distance. Includes auto-generated race split table with wristband view for marathon, half marathon, 10K, 5K, and custom distances.
★ 4.918K uses
Army Body Fat
Health & Fitness
Calculate body fat using the official U.S. Army AR 600-9 tape test method. Includes pass/fail by age bracket, screening weight reference, and regulation-quoted measurement protocol.
★ 4.931K uses
Carb Calculator
Health & Fitness
Calculate your daily carbohydrate needs based on weight, goal, and training volume. Includes glycogen loading timeline for endurance events and food equivalents.
★ 4.924K uses
LBM Calculator
Health & Fitness
Calculate your lean body mass using Boer, James, and Hume formulas simultaneously. Get estimated fat mass and lean mass percentage without body fat measurements.
★ 4.938K uses
Healthy Weight
Health & Fitness
Determine your healthy weight range using BMI, Waist-to-Height Ratio (WHtR), and frame size adjustment. Features the "waist less than half your height" rule.
★ 4.938K uses
Calorie Calculator
Health & Fitness
Calculate your daily calorie needs using BMR and activity level. Compare intake vs. burned to plan weight loss, gain, or maintenance.
★ 4.939K uses
Calories Burned
Health & Fitness
Calculate calories burned for 100+ activities using MET values from the Compendium of Physical Activities. Categorized by running, cycling, strength, swimming, sports, and more.
★ 4.945K uses
1RM Calculator
Health & Fitness
Calculate your one rep max using Epley, Brzycki, and Lombardi formulas. Includes auto-generated 50–100% percentage breakdown table for barbell training programming.
★ 4.917K uses
Protein Calculator
Health & Fitness
Calculate your daily protein needs based on the evidence-based range of 1.6–2.2 g/kg. Includes per-meal breakdown, MPS optimization, and food equivalent guide.
★ 4.939K uses
Fat Intake
Health & Fitness
Calculate your daily fat intake recommendation with a saturated/monounsaturated/polyunsaturated breakdown. Features AHA 5–6% saturated fat limit guideline, visual breakdown panel, and omega-3 targets.
★ 4.910K uses
Period & Ovulation
Health & Fitness
Track your menstrual cycle and predict periods, ovulation dates, and fertile windows for 3 months. 100% private — all data processed locally on your device with a visible privacy badge.
★ 4.952K uses
GFR Calculator
Health & Fitness
Calculate your estimated GFR in seconds. Enter your creatinine, age and sex to check your kidney function using the 2021 CKD-EPI equation. Includes CKD stages 1–5, kidney function level, and clinical staging chart.
★ 4.911K uses
Body Type
Health & Fitness
Determine your body shape from bust, waist, and hip measurements. Classifies Pear, Apple, Hourglass, Rectangle, and Inverted Triangle shapes with styling tips and somatotype disclaimer.
★ 4.953K uses
BSA Calculator
Health & Fitness
Calculate your body surface area using Mosteller, Du Bois, and Haycock formulas. Includes formula comparison panel, BSA reference chart, and mandatory clinical dosing warning.
★ 4.911K uses
BAC Calculator
Health & Fitness
Estimate your blood alcohol concentration using the Widmark formula with impairment levels, time-to-zero, and time-to-legal-limit. Features bold harm-reduction disclaimer and standard drink reference guide.
★ 4.911K uses
Macro Points
Health & Fitness
Score any food using a macronutrient-weighted points formula based on calories, saturated fat, sugar, and protein. Not affiliated with Weight Watchers. Includes full point breakdown and reference food scores.
★ 4.917K uses
Overweight Risk
Health & Fitness
Assess your weight and cardiovascular risk by combining BMI with waist-to-height ratio (WHtR). Features visceral fat education, actionable risk reduction steps, and the "waist less than half your height" rule.
★ 4.910K uses
Chocolate Toxicity
Health & Fitness
Check if chocolate is toxic for your dog. Calculates theobromine and caffeine intake based on chocolate type, amount eaten, and dog weight. Includes severity color coding, vomiting and seizure thresholds, and emergency guidance with ASPCA poison control number.
★ 4.916K uses
Pet Age
Health & Fitness
Convert your pet's age to human years using the NIH epigenetic clock formula (16×ln(age)+31 for dogs) and the standard cat formula. Includes AAHA/AAFP life stage classification and size-adjusted dog aging.
★ 4.917K uses
Pet Pregnancy
Health & Fitness
Calculate the due date for a pregnant dog (63 days gestation) or cat (65 days gestation). Includes trimester stages, days remaining countdown, and week-by-week development calendar.
★ 4.959K uses
Blood Type
Health & Fitness
Predict possible blood types for a child based on parent ABO and Rh types. Visualize inheritance with Punnett square probabilities. Learn how the 3-allele ABO system and Rh dominance genetics work.
★ 4.910K uses
About Health & Fitness Calculators
Track your fitness, understand your body metrics, and plan for healthy living with our evidence-based health calculators. Each tool uses clinically validated formulas from medical research institutions.
Browse our curated collection of health & fitness calculators below. Each tool includes detailed formulas, educational content, and real-time results. Use the 33 calculators in this category to make informed decisions, solve problems, and get accurate answers instantly.
BMI, BMR, TDEE, and body fat calculators
Heart rate zones and calorie burn estimators
Pregnancy due date and conception calculators
Evidence-based formulas from medical standards
Frequently Asked Questions
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is healthy for most adults. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese. BMI is a screening tool and does not account for muscle mass, so athletic individuals may get a less accurate reading.
How many calories should I eat per day?
The average adult needs between 1,600 and 3,000 calories per day depending on age, gender, and activity level. Use our calorie calculator to get a number tailored to your goals, whether you want to maintain, lose, or gain weight.
What is the difference between BMR and TDEE?
BMR (basal metabolic rate) is the calories your body burns at complete rest. TDEE (total daily energy expenditure) adds in walking, exercise, digestion, and daily movement. Use TDEE for diet planning.
How accurate is the due date calculator?
Due date calculators are most accurate with a known last menstrual period and regular 28-day cycle. Only about 5% of babies arrive on their exact due date, so treat it as an estimate. Your healthcare provider will adjust based on early ultrasound.