8 free tools
Health & Fitness
BMI, BMR, water, calories. Each listed tool has free public access, with processing and account requirements labeled where applicable.
- Free public access
- Account rules labeled
- Processing clearly labeled
- Instant results
Most used health & fitness tools
BMI Calculator
Calculate body mass index in metric or imperial units, see your WHO category and healthy weight range, with optional Asian cutoffs.
BMR Calculator
Estimate basal metabolic rate with the Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle formula, plus a TDEE table for every activity level.
Calorie Calculator
Estimate maintenance calories (TDEE) and targets for six goals from lose-fast to gain, with protein, carb, and fat grams for three macro splits.
Macro & TDEE Calculator
Compare three BMR formulas, estimate TDEE, and split goal calories into protein, carb, and fat grams — including keto — with protein-per-kg feedback.
All health & fitness tools
BMI Calculator
Calculate body mass index in metric or imperial units, see your WHO category and healthy weight range, with optional Asian cutoffs.
BMR Calculator
Estimate basal metabolic rate with the Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle formula, plus a TDEE table for every activity level.
Water Intake Calculator
Estimate daily water needs from body weight and exercise, with climate, pregnancy, and breastfeeding adjustments and a glasses-per-day conversion.
Calorie Calculator
Estimate maintenance calories (TDEE) and targets for six goals from lose-fast to gain, with protein, carb, and fat grams for three macro splits.
Macro & TDEE Calculator
Compare three BMR formulas, estimate TDEE, and split goal calories into protein, carb, and fat grams — including keto — with protein-per-kg feedback.
Pregnancy Due Date Calculator
Estimate your due date from last period, conception, IVF transfer, or ultrasound — with current week, trimester, milestones, and key dates.
Ovulation & Period Tracker
Predict your ovulation day, fertile window, and next six periods from your cycle details, laid out on a colour-coded monthly calendar.
Body Fat Percentage Calculator
Estimate body fat with the U.S. Navy circumference method from height, neck, waist, and hip tape measurements — no scales or calipers.
Why use these health & fitness tools
Instant, private estimates
Enter your numbers and see a result immediately. The BMI Calculator and BMR Calculator run in your browser, so your height, weight and age aren't stored or sent anywhere.
Formulas you can understand
Each calculator uses a documented, widely used formula — the BMI Calculator uses the standard weight-over-height-squared method — so you know where the number comes from.
Plan around real targets
Use the Macro & TDEE Calculator to turn a goal into daily calorie and macro targets you can actually track.
What you can do with Health & Fitness
Check your BMI and see which standard category it falls into with the BMI Calculator.
Estimate the calories you burn at rest using the BMR Calculator to plan a diet.
Work out daily calorie and macro targets for a goal with the Macro & TDEE Calculator.
Estimate a due date or fertile window with the Pregnancy Due Date Calculator and the Ovulation & Period Tracker.
How to choose the right tool
Understanding body metrics?
The BMI Calculator gives a quick category, while the Body Fat Percentage Calculator estimates composition in more detail.
Planning nutrition?
Start with the BMR Calculator for your baseline, then the Macro & TDEE Calculator for daily targets.
Tracking a cycle?
The Pregnancy Due Date Calculator and the Ovulation & Period Tracker estimate key dates from the information you enter.
About Health & Fitness
Monitor your physical well-being and fitness goals with our straightforward health calculators. Whether you want to calculate your Body Mass Index (BMI), determine your Basal Metabolic Rate (BMR) for diet planning, track your daily water intake, or estimate calories burned during exercise, these tools provide quick and accurate insights. Designed for everyday users and fitness enthusiasts alike, our health tools deliver instant calculations privately in your browser, keeping your personal health data completely secure.
Health and fitness calculators run entirely in your browser — nothing you enter is stored or uploaded. Results are general estimates for information only and are not medical advice; consult a healthcare professional for decisions about your health.