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