Free health, fitness, nutrition, and utility calculators. No signup, no data collection — just smart tools built on real science for smarter decisions.
Every calculator runs in your browser. No data stored, no accounts needed.
Calculate Body Mass Index. See WHO classification and healthy weight range.
WHO FORMULAEstimate body fat percentage using the U.S. Navy circumference method.
NAVY METHODFind ideal weight using Devine, Robinson, Miller, and Hamwi formulas.
4 FORMULASCalculate Basal Metabolic Rate — calories burned at rest.
MIFFLIN-ST JEORAssess health risk from body fat distribution using WHO guidelines.
WHO GUIDELINESEstimate calories burned during 20+ activities using MET values.
MET VALUESEstimate your one-rep max using Epley and Brzycki formulas.
EPLEY + BRZYCKIFind exercise heart rate zones using the Karvonen method.
KARVONEN METHODCalculate running pace, finish time, or distance. Mile and km.
RUN / WALKFind daily calories for weight loss, maintenance, or gain.
MIFFLIN-ST JEORTotal Daily Energy Expenditure combining BMR with activity level.
GOLD STANDARDGet optimal daily protein, carb, and fat intake for your goals.
IIFYMCalculate recommended daily protein based on weight and goals.
PER-GOALFind recommended daily water based on weight and activity.
HYDRATIONCalculate BSA using Du Bois and Mosteller formulas.
DU BOISEstimate lean mass using Boer and James formulas.
BOER + JAMESDetermine somatotype — ectomorph, mesomorph, or endomorph.
SOMATOTYPEEstimate blood alcohol content from drinks, weight, and time.
WIDMARKExact age in years, months, days. Days until next birthday.
PRECISEPercentages, increases, decreases, and differences.
UNIVERSALOptimal bedtime based on 90-minute sleep cycles.
SLEEP CYCLESPregnancy due date using Naegele's Rule.
NAEGELE'S RULESee inflation-adjusted lifetime costs of your monthly subscriptions over 5-30 years.
BLS CPI DATAEvidence-based AI disruption risk score for your occupation.
O*NET DATAQuantify cumulative lifestyle stress using Holmes-Rahe scale.
HOLMES-RAHETrue cost including time, depreciation, emissions, and opportunity cost.
AAA + EPACognitive load across NASA-TLX dimensions.
NASA-TLXMaking informed health and fitness decisions requires good data. Whether you're tracking body composition, planning nutrition, optimizing workouts, or making everyday calculations, UtilityEmpire gives you the numbers you need to decide with confidence.
Every calculator runs entirely in your browser. We don't store your health data, don't require accounts, and don't sell information.
Each tool is built on established scientific formulas and evidence-based models. Our BMI calculator uses the standard WHO formula. Our TDEE calculator implements the Mifflin-St Jeor equation, considered the most accurate by the American Dietetic Association. Our body fat calculator uses the U.S. Navy circumference method. Every formula is documented on each calculator's page so you can verify the math yourself.
UtilityEmpire is designed for anyone making health, fitness, and life decisions: people starting a fitness journey, athletes optimizing training, individuals managing nutrition goals, professionals assessing career risks, and anyone who wants quick, reliable calculations. No jargon, no confusing interfaces — just clear inputs and useful outputs.
We organize our 27 tools into six focused clusters. The Health cluster includes BMI, body fat, ideal weight, basal metabolic rate, and waist-to-hip ratio. The Fitness cluster covers calories burned, one-rep max, target heart rate, and pace. The Nutrition cluster helps with calorie needs, TDEE, macros, protein, and water intake. The Body Composition cluster provides BSA, lean body mass, body type, and BAC. The Daily Utility cluster offers age, percentage, sleep cycle, and due date calculators. The Lifestyle cluster features subscription cost projection, AI job risk scanning, stress indexing, commute cost analysis, and mental load quantification — all built on real government and research data.