Fitness & Health Calculators
Plan training and understand common health metrics with fast, private calculators. From BMI and calorie estimates to pregnancy dating and cycle tools, everything runs locally with clear disclaimers for education—not medical advice.
20free tools · No sign-up required
Age Calculator
Exact age from your birth date.
BMI Calculator
BMI and category from height and weight.
Calorie Calculator (TDEE)
Maintenance calories (TDEE) estimate.
Body Fat Calculator
Tape-measure body fat estimate (Navy).
BMR Calculator
Basal metabolic rate in kcal/day.
Ideal Weight Calculator
Devine ideal weight from height.
Pace Calculator
Pace per km from time and distance.
Army Body Fat Calculator
Tape-based estimate used in screening.
Lean Body Mass Calculator
LBM estimate from height and weight.
Healthy Weight Calculator
Healthy kg range for your height.
Calories Burned Calculator
kcal burned from MET and time.
One Rep Max Calculator
1RM estimate from weight × reps.
Target Heart Rate Calculator
Heart-rate zones for training.
Pregnancy Calculator
EDD, weeks, and trimester from LMP.
Pregnancy Weight Gain Calculator
IOM-style gain range from pre-pregnancy BMI.
Pregnancy Conception Calculator
Conception and EDD from LMP.
Due Date Calculator
Due date from LMP.
Ovulation Calculator
Ovulation day and fertile window.
Conception Calculator
Likely ovulation and conception window.
Period Calculator
Next period from cycle length.