Health & Fitness Calculators
34 tools, each with formula and worked examples
BMI, calorie, body fat, pregnancy, and wellness calculators.
Body Composition· 8
BMI Calculator
Calculate your Body Mass Index and ideal weight range for your height. Features a WHO classification visual ga…
Body Fat Calculator
Calculate your body fat percentage using the U.S. Navy circumference method. Uses neck, abdomen (men), and wai…
Ideal Weight Calculator
Calculate your ideal body weight using Devine, Robinson, Miller, and Hamwi formulas. Get the average across al…
Army Body Fat
Calculate body fat using the official U.S. Army AR 600-9 tape test method. Includes pass/fail by age bracket, …
LBM Calculator
Calculate your lean body mass using Boer, James, and Hume formulas simultaneously. Get estimated fat mass and …
Healthy Weight
Determine your healthy weight range using BMI, Waist-to-Height Ratio (WHtR), and frame size adjustment. Featur…
Body Type Calculator
Determine your body shape from bust, waist, and hip measurements. Classifies Pear, Apple, Hourglass, Rectangle…
Overweight Risk
Assess your weight and cardiovascular risk by combining BMI with waist-to-height ratio (WHtR). Free, instant, …
Nutrition· 9
TDEE Calculator
Find your maintenance calories in seconds. Uses Mifflin-St Jeor and Katch-McArdle equations with BMR/TEF/EAT/N…
BMR Calculator
Calculate your Basal Metabolic Rate using Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle formulas. Free, …
Water Intake
Calculate your recommended daily water intake based on body weight, activity level, and climate. Free, instant…
Macro Calculator
Calculate your daily macronutrient targets based on TDEE, fitness goal, and diet preference. Free online calcu…
Carb Calculator
Calculate your daily carbohydrate needs based on weight, goal, and training volume. Includes glycogen loading …
Calorie Calculator
Calculate your daily calorie needs using BMR and activity level. Compare intake vs. burned to plan weight loss…
Protein Calculator
Calculate your daily protein needs based on the evidence-based range of 1.6–2.2 g/kg. Includes per-meal breakd…
Fat Intake
Calculate your daily fat intake recommendation with a saturated/monounsaturated/polyunsaturated breakdown. Fre…
Macro Points
Score any food using a macronutrient-weighted points formula based on calories, saturated fat, sugar, and prot…
Pregnancy· 4
Due Date Calculator
Calculate your estimated due date from LMP, conception date, or IVF transfer date. View current pregnancy week…
Pregnancy Calculator
Track your pregnancy week by week. Calculate due date, current trimester, gestational age, and key milestones …
Pregnancy Weight Gain
Track your pregnancy weight gain against IOM guidelines based on pre-pregnancy BMI. Features worked examples, …
Conception Calculator
Calculate your fertile window, peak fertility days, and estimated ovulation date using LMP, cycle, or next per…
Fitness· 4
Heart Rate Zones
Calculate your 5 training heart rate zones using the Karvonen formula or percentage of max HR. Free, instant, …
Pace Calculator
Calculate running pace, time, or distance. Includes auto-generated race split table with wristband view for ma…
Calories Burned
Calculate calories burned for 100+ activities using MET values from the Compendium of Physical Activities. Fre…
1RM Calculator
Calculate your one rep max using Epley, Brzycki, and Lombardi formulas. Includes auto-generated 50–100% percen…
Reproductive Health· 1
Medical· 4
GFR Calculator
Free eGFR calculator using the 2021 CKD-EPI race-free equation. Enter creatinine, age, and sex to get your kid…
BSA Calculator
Calculate your body surface area using Mosteller, Du Bois, and Haycock formulas. Includes formula comparison, …
BAC Calculator
Estimate your blood alcohol concentration using the Widmark formula with custom ABV support for craft beer, wi…
Blood Type
Predict possible blood types for a child based on parent ABO and Rh types. Visualize inheritance with Punnett …
Pet Health· 4
Chocolate Toxicity
Check if chocolate is toxic for your dog. Calculates theobromine and caffeine intake based on chocolate type, …
Dog & Cat Age in
Calculate dog and cat age in human years with the NIH epigenetic clock formula. Includes AAHA/AAFP life stages…
Pet Pregnancy
Calculate the due date for a pregnant dog (63 days gestation) or cat (65 days gestation). Free online calculat…
Pig Gestation
Calculate pig farrowing dates using the 3-3-3 rule (114 days). Pregnancy milestones, breed-specific adjustment…