Best Free Health Calculators
Health questions usually end in a number: what is my BMI, when is the baby due, when is my fertile window. This collection gathers the nine most-searched health calculators, each showing the standard formula or estimate behind the result.
All results are general estimates for personal tracking — always confirm medical questions with your doctor.
BMI Calculator
BMI with weight categories and healthy range.
Pregnancy Calculator
Week, trimester and weekly guides from LMP.
Due Date Calculator
EDD by LMP, conception or ultrasound data.
Ovulation Calculator
Ovulation day and fertile window estimate.
Age Calculator
Exact age to the day plus running totals.
Sleep Cycle Calculator
Bed/wake times aligned to 90-minute cycles.
Caffeine Tracker
Model caffeine decay and plan a cutoff time.
Bedtime Water Calculator
Time your last glass to avoid night waking.
Food Calorie Table
Look up food calories and log daily intake.