Health Tools
Estimate your BMI, daily calorie needs, heart-rate training zones or a pregnancy due date in seconds. The health calculators turn standard formulas — from BMR and TDEE to waist-to-height ratio — into quick, readable answers. They run entirely in your browser so your measurements stay private, and they are informational guides rather than medical advice.
23 tools, ready when you are
- BMI Calculator Body Mass Index calculator with metric & imperial units. Health
- BMR Calculator Basal Metabolic Rate calculator using Mifflin-St Jeor or Harris-Benedict. Health
- Calorie Calculator Daily calorie needs and TDEE calculator with activity levels and goals. Health
- Ideal Weight Calculator Ideal body weight calculator from four medical formulas. Health
- Water Intake Calculator Estimate your daily water intake from weight and activity. Health
- Body Fat Calculator Estimate body fat percentage with the US Navy method. Health
- Calories Burned Calculator Estimate calories burned by activity and duration. Health
- Pace Calculator Calculate running pace, speed, and finish time from distance and time. Health
- Sleep Cycle Calculator Find the best bedtime or wake-up time based on 90-minute sleep cycles. Health
- Blood Alcohol Content (BAC) Estimator Estimate your blood alcohol content (BAC) from drinks, weight, sex, and time. Health
- BMI & Calorie Target Calculator Calculate your BMI and daily calorie target for weight loss, maintenance or gain. Health
- Macro Calculator Calculate daily protein, carb and fat targets in grams from your calorie target and macro split. Health
- TDEE Calculator Estimate your Total Daily Energy Expenditure (calories burned per day) from BMR x activity, with metric or imperial units and a goal target. Health
- Heart Rate Zone Calculator Find your training heart rate zones (Zone 1-5) from age and resting heart rate, using Karvonen or percent-of-max methods. Health
- One Rep Max Calculator Estimate your one-rep max (1RM) from a weight you lifted for reps, using Epley, Brzycki, Lombardi or Lander, plus a training-load table. Health
- Pregnancy Due Date Calculator Estimate your pregnancy due date from your last period or conception date, with trimester milestones. Health
- Ovulation Calculator Find your fertile window and next ovulation date from your last period and cycle length. Health
- Pregnancy Weight Gain Calculator See recommended pregnancy weight gain by pre-pregnancy BMI, pregnancy type, and current week. Health
- Waist-to-Height Ratio Calculator Check your waist-to-height ratio (WHtR) against the 0.5 healthy boundary and risk bands. Health
- Body Surface Area Calculator Calculate body surface area (BSA) in m² with the Du Bois, Mosteller, Haycock and Gehan & George formulas. Health
- Waist-to-Hip Ratio Calculator Check your waist-to-hip ratio (WHR) against WHO risk cutoffs for men and women. Health
- Steps to Calories Calculator Turn any step count into distance, walking time, and calories burned from stride, weight, and pace. Health
- Caffeine Half-Life Calculator See how much caffeine is still in your system and when it drops below your cutoff threshold. Health
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