Health Calculators
Daily Calorie Calculator: Mifflin-St Jeor Formula
Basal metabolic rate (BMR) and daily calorie needs from sex, age, height, weight and activity.
BMI Calculator: Body Mass Index
Adult body mass index from height and weight: WHO category and healthy weight range.
Macro Calculator: Protein, Fat and Carbs from Calories
How many grams of protein, fat and carbohydrate suit your daily calories at different ratios.
Pace Calculator: Running Pace, Time and Distance
Running pace, time or distance, and predicted results for other distances.
Target Heart Rate Zones Calculator
Maximum heart rate by age and training zones by the simple and Karvonen methods.
Sleep Calculator: When to Go to Bed and Wake Up
Bedtime or wake-up time based on 90-minute sleep cycles.
Ideal Weight Calculator: Formulas and Healthy Range
Estimated weight from height and sex: Devine, Robinson, Miller and Hamwi formulas and the healthy BMI range.
Pregnancy Calculator: Gestational Age and Due Date
Gestational age, trimester and estimated due date from the last period or conception date.
Ovulation and Period Calculator
Estimated ovulation date, fertile window and upcoming periods for the next three cycles.
Body Composition Calculator: Fat, Lean Mass, Shape, BSA
Body fat, lean mass, body shape and body surface area by formulas.
Pregnancy Weight Gain Calculator: Range by Week
The recommended weight gain range by week of pregnancy based on BMI.
Calories Burned Calculator by Activity and Time
Calories used in running, walking, swimming and other activities.
One Rep Max Calculator: 1RM from Weight and Reps
The one rep max estimated from the weight and reps, with a table of training weights.
GFR Calculator: eGFR from Creatinine, CKD-EPI 2021
The eGFR from creatinine by CKD-EPI 2021 and Schwartz. A doctor evaluates the result.
Blood Alcohol Calculator: Widmark Estimate
A rough blood alcohol estimate. The result does not show whether you may drive.
Child Height Predictor: from Parents’ Height
A child’s adult height from the parents’ heights with a range. The result is an estimate.
BMI, calories, heart rate, sleep and cycle tools. Results are for reference and do not replace medical advice.
- BMI — Adult body mass index from height and weight: WHO category and healthy weight range.
- Calories — Basal metabolic rate (BMR) and daily calorie needs from sex, age, height, weight and activity.
- Ideal Weight — Estimated weight from height and sex: Devine, Robinson, Miller and Hamwi formulas and the healthy BMI range.
- Macros — How many grams of protein, fat and carbohydrate suit your daily calories at different ratios.
- Running Pace — Running pace, time or distance, and predicted results for other distances.
- Heart Rate Zones — Maximum heart rate by age and training zones by the simple and Karvonen methods.
- Sleep — Bedtime or wake-up time based on 90-minute sleep cycles.
- Pregnancy — Gestational age, trimester and estimated due date from the last period or conception date.
- Ovulation — Estimated ovulation date, fertile window and upcoming periods for the next three cycles.