BMI (Body Mass Index)
Weight/height². Categories: underweight, normal, overweight, obese. Useful at population level; doesn’t distinguish muscle from fat. Use BMI calculator.
BMR (Basal Metabolic Rate)
Calories burned at complete rest. Base for TDEE. Mifflin-St Jeor is widely used. Use our BMR calculator.
TDEE (Total Daily Energy Expenditure)
Total daily calorie burn including activity. Key number for setting calorie targets. Use our TDEE calculator.
Body Fat Percentage
Proportion of weight from fat. Navy method uses circumference; DEXA/BIA are more accurate but require equipment. Use our body fat calculator.
1RM (One Rep Max)
Heaviest weight lifted for one rep. Used to set training loads and track strength. Use our 1RM calculator.
Heart Rate Zones
Ranges of max HR % for different training goals: recovery, fat burn, endurance, intensity. Use our heart rate zones calculator.