💚 Health & Fitness Calculators
Thirteen calculators covering body composition, energy needs, training pace and pregnancy dates. They are estimates built on published formulas, not a substitute for a clinician.
BMI Calculator
Body mass index with WHO categories and your healthy range.
🧬Body Fat Calculator
Body fat percentage by the US Navy tape method or BMI.
⚖Ideal Weight Calculator
Healthy weight range across four clinical formulas.
🔥BMR Calculator
Resting calorie burn and the daily total for your activity level.
🥗Calorie Calculator
Daily calories to maintain, lose or gain weight.
🏃Pace Calculator
Running pace, finish time and splits for any distance.
🤰Pregnancy Calculator
How many weeks along you are and what comes next.
👶Due Date Calculator
Estimated delivery date from LMP, conception or scan.
🌸Conception Calculator
Ovulation day, fertile window and likely conception date.
🔥TDEE Calculator
Everything you burn in a day, broken into its four parts.
🥗Macro Calculator
Calories turned into grams of protein, carbs and fat.
🏋One Rep Max Calculator
Your 1RM from any set, across five formulas.
🏃Calories Burned Calculator
Calories for any activity, from published MET values.
About these 13 health & fitness tools
These nine tools use the formulas that clinicians and sports scientists actually publish: Mifflin-St Jeor for resting metabolism, the US Navy circumference method for body fat, the WHO ranges for BMI and Naegele's rule for due dates.
Formulas like these describe populations, not individuals. A BMI of 27 means something different for a sedentary office worker and for a rower, and no equation on this page can tell the two apart. Treat every number here as a starting point for a conversation, not as a diagnosis.