Health and fitness calculators
Track your health metrics with free, science-based calculators. BMI, calorie targets, sleep optimization, and more — no sign-up required.
BMI Calculator
Calculate your Body Mass Index and see your weight category. Shows healthy weight range for your height. Metric and imperial supported.
Use this tool →TDEE Calculator
Calculate your Total Daily Energy Expenditure and Basal Metabolic Rate. Get calorie targets for weight loss, maintenance, and muscle gain.
Use this tool →Calories Burned Calculator
Estimate calories burned for 40+ activities based on your weight and duration. Uses MET values from the Compendium of Physical Activities.
Use this tool →Pregnancy Due Date Calculator
Calculate your estimated due date, current week of pregnancy, and trimester. Supports LMP, conception date, and IVF transfer date.
Use this tool →Sleep Calculator
Find the ideal bedtime or wake-up time based on 90-minute sleep cycles. Wake up feeling refreshed between cycles.
Use this tool →Water Intake Calculator
Calculate how much water you should drink daily based on your weight, activity level, and climate. Get an hourly drinking schedule.
Use this tool →Related categories
Which tool should you start with?
Frequently asked questions
Are health calculators medical advice?
No. They are screening and planning aids only. Consult a healthcare provider before making health decisions.
Why do BMI and TDEE results differ from real life?
The formulas use population averages. Muscle mass, medication, medical conditions, age, and activity tracking accuracy can all affect real results.
Which health tool should I start with?
Use BMI for a broad weight-category screen, TDEE for calorie planning, and calories burned for activity estimates.
Do health inputs get stored?
No. The calculations run in your browser and are not sent to FreelancerTools servers.