Free Health Calculators for Body, Nutrition & Wellbeing

Check whether your weight falls in a healthy range for your height using WHO-aligned BMI ranges.

Age-based BMI percentiles for children and teens.

Estimate body fat percentage using standard measurement formulas for men and women.

Estimate a healthy weight range for your height using established medical formulas.

Estimate the weight of everything but fat — muscle, bone, and water.

Estimate skeletal muscle mass and see how it compares with typical ranges.

Find daily calorie needs based on age, weight, height, and activity level.

Split daily calories into protein, carbohydrate, and fat targets.

Macro targets tuned for ketogenic low-carb eating.

Daily protein intake target based on weight, goals, and training.

Estimate daily hydration needs from body weight, climate, and activity.

Calculate glycemic load to make blood-sugar-friendly food choices.

Plan a calorie deficit and project a realistic weight loss timeline.

Plan fasting and eating windows for 16:8, 18:6, and other protocols.

Estimate the calories your body needs at complete rest.

Total daily energy expenditure including activity — the basis for any calorie plan.

Convert daily step counts into estimated calories burned.

Training zones for fat burn, endurance, and peak effort from your max heart rate.

Estimate aerobic fitness capacity and compare against age-group norms.

Estimate how long reaching visible abs could take at your current body fat.

Quick assessment of your current fitness level with suggested next steps.

Interpret systolic and diastolic readings against standard categories.

Check resting heart rate and target ranges by age.

Interpret fasting and post-meal glucose readings, with unit conversion.

Estimate vitamin D needs from sun exposure, diet, and location.

Understand typical testosterone ranges by age and related lifestyle factors.

Estimate blood alcohol concentration from drinks, weight, and time.

Track pregnancy week by week from your last period or conception date.

Estimate your delivery date and key trimester milestones.

Predict your fertile window and ovulation day from cycle dates.

Predict upcoming cycles and understand cycle-length patterns.

Estimate your most fertile days when planning for pregnancy.

Check recommended weight gain ranges by trimester and pre-pregnancy BMI.

A guide to typical recovery milestones after delivery.

Educational screening based on validated PHQ-9 and GAD-7 frameworks.

Find ideal bed and wake times based on natural 90-minute sleep cycles.

Gauge current stress load and identify the biggest contributors.

Estimate your 10-year risk of heart attack or stroke with the ACC/AHA Pooled Cohort Equations.

Estimate your 10-year type 2 diabetes risk with the validated FINDRISC score.

Calculate your CHA2DS2-VASc score to estimate stroke risk in atrial fibrillation and guide anticoagulation discussions.

Check how many of the 5 ATP III metabolic syndrome criteria you meet.

Screen your bone fracture risk factors using USPSTF-based guidance, and see if a DXA scan or FRAX assessment is worth pursuing.