Health.
Use transparent health, fitness, pregnancy, and wellbeing estimates with clear safety limits.
Tools in health
21 RESULTSBMR Calculator
Estimate resting energy needs with Mifflin–St Jeor.
BMI Screening Calculator
Calculate BMI and show a non-diagnostic low-BMI screen.
Army Body Fat Calculator
Estimate circumference body-fat screening.
Adult BMI & Reference Weight Range Calculator
Calculate adult BMI and a height-based BMI reference range while keeping screening limitations and respectful language visible.
Body Fat Calculator
Estimate body fat with the BMI/age equation.
Calorie Calculator
Estimate Mifflin–St Jeor needs with activity.
Calories Burned Calculator
Estimate exercise energy from MET, weight, and duration.
Due Date Calculator
Estimate due date from last menstrual period.
Pace Calculator
Calculate pace per distance unit.
Pregnancy Calculator
Estimate gestational age from LMP.
Ovulation, Period & Conception Date Estimator
Estimate a next period, ovulation day, fertile window, and likely conception timing from a regular-cycle assumption.
Pregnancy Weight Gain Calculator
Show IOM total gain range by prepregnancy BMI.
Sleep Calculator
Plan wake time around 90-minute sleep cycles.
BAC Estimate Calculator
Estimate blood alcohol concentration with a transparent Widmark-style model and uncompromising driving-safety guidance.
Body Surface Area Calculator
Estimate body surface area from height and weight using the Mosteller equation, with clinical-use limitations stated clearly.
eGFR Calculator
Estimate adult kidney filtration with the race-free 2021 CKD-EPI creatinine equation and explicit clinical limitations.
Height-Based Weight Formula Calculator
Compare four historical height-based weight formulas without presenting any single result as a required or ideal body weight.
Lean Body Mass Calculator
Estimate adult lean body mass with the Boer equation and show the implied percentage without treating it as a measured composition test.
Macronutrient, Carbohydrate & Protein Calculator
Convert a daily calorie estimate into carbohydrate, protein, and fat grams while showing adult reference ranges and pregnancy exclusions.
Target Heart Rate Calculator
Estimate age-based moderate and vigorous exercise heart-rate zones using the American Heart Association’s simple method.
TDEE Calculator
Estimate adult resting energy with Mifflin–St Jeor and multiply it by a clearly labeled activity factor.