Health & Wellness Calculators for Body and Mind
Track your health metrics without uploading personal data to servers. Calculate BMI, Basal Metabolic Rate, and daily water intake using evidence-based formulas — all running 100% locally in your browser. Free, private health tools for everyone.
Your health data is too personal for cloud servers. Calculate BMI, BMR, daily water intake, and more — all running entirely in your browser. Science-backed formulas with zero data collection.
Blood Alcohol Calculator
Estimate BAC with multi-drink timeline, Watson formula, and safe-to-drive countdown
BMI Calculator
Calculate your Body Mass Index and health category
BMR Calculator
Calculate your Basal Metabolic Rate and daily calorie needs
Body Fat Calculator
Calculate body fat percentage using the U.S. Navy method
4-7-8 Breathing Timer
Guided breathing exercise with animated circle, progressive difficulty, and streak tracking
Caffeine Half-Life Calculator
Track caffeine decay over 24 hours and find safe sleep time
Calories Burned Calculator
Compare calories burned across activities with MET data and food equivalents
Heart Rate Zones Calculator
Calculate your 5 heart rate training zones based on age
Ideal Weight Calculator
Calculate your ideal weight using five scientific formulas
Intermittent Fasting Timer
Track fasting with protocol selection, stage visualization, and streak tracking
Keto Macro Calculator
Calculate keto macros with workout/rest day toggle and net carbs tracking
Macro Calculator
Calculate your daily protein, carbs, and fat intake based on your calorie goals.
One-Rep Max Calculator
Estimate your 1RM using 5 formulas with training load table and plate calculator
Pregnancy Due Date Calculator
Calculate your due date with multiple methods and trimester milestone timeline
Sleep Cycle Calculator
Calculate optimal bedtime and wake time based on 90-minute sleep cycles
Stress Level Test (PSS-10)
Measure perceived stress with the validated PSS-10 questionnaire and subscale analysis
TDEE Calculator
Calculate your Total Daily Energy Expenditure based on age, weight, height, and activity level.
Test Your Typing Speed
Measure WPM, accuracy, and consistency with timed typing tests
Waist-to-Hip Ratio Calculator
Calculate WHR with WHO risk classification and waist circumference assessment
Water Intake Calculator
Calculate your recommended daily water intake
Pick the health metric you want to calculate
BMI, BMR, daily water intake, calorie needs, body fat percentage: each calculator focuses on one measurement. They use peer-reviewed formulas and clearly state which equation is applied.
Enter your body measurements
Height, weight, age, activity level. You can switch between metric and imperial units at any time. The tool saves nothing; re-enter your data each visit if your numbers have changed.
Review your results
The output includes the calculated value plus context: healthy ranges, WHO classifications, or general guidance. Remember that these tools are informational; they do not replace medical advice from a professional.
Track your progress manually
Write down your results or screenshot them. Since we store nothing on our servers, tracking over time is your responsibility. A simple spreadsheet works well for this.
People Starting a Fitness Journey
Knowing your BMI, BMR, and daily calorie needs is the foundation of any evidence-based fitness plan. Our calculators give you these numbers without requiring an app download or a premium subscription. Enter your measurements; get the data you need to set realistic goals.
Nutritionists Creating Client Plans
Quick access to TDEE and macronutrient calculators speeds up the intake planning process. Run the numbers for each client in the browser; no need to open a spreadsheet for basic calculations.
Anyone Tracking Hydration
The water intake calculator adjusts recommendations based on your weight, activity level, and climate. It is more personalized than the generic "drink 8 glasses a day" advice and takes less than 10 seconds to use.
| Tool | Best For |
|---|---|
| Blood Alcohol Calculator | Estimate BAC with multi-drink timeline, Watson formula, and safe-to-drive countdown |
| BMI Calculator | Calculate your Body Mass Index and health category |
| BMR Calculator | Calculate your Basal Metabolic Rate and daily calorie needs |
| Body Fat Calculator | Calculate body fat percentage using the U.S. Navy method |
| 4-7-8 Breathing Timer | Guided breathing exercise with animated circle, progressive difficulty, and streak tracking |
| Caffeine Half-Life Calculator | Track caffeine decay over 24 hours and find safe sleep time |
| Calories Burned Calculator | Compare calories burned across activities with MET data and food equivalents |
| Heart Rate Zones Calculator | Calculate your 5 heart rate training zones based on age |
| Ideal Weight Calculator | Calculate your ideal weight using five scientific formulas |
| Intermittent Fasting Timer | Track fasting with protocol selection, stage visualization, and streak tracking |
| Keto Macro Calculator | Calculate keto macros with workout/rest day toggle and net carbs tracking |
| Macro Calculator | Calculate your daily protein, carbs, and fat intake based on your calorie goals. |
| One-Rep Max Calculator | Estimate your 1RM using 5 formulas with training load table and plate calculator |
| Pregnancy Due Date Calculator | Calculate your due date with multiple methods and trimester milestone timeline |
| Sleep Cycle Calculator | Calculate optimal bedtime and wake time based on 90-minute sleep cycles |
| Stress Level Test (PSS-10) | Measure perceived stress with the validated PSS-10 questionnaire and subscale analysis |
| TDEE Calculator | Calculate your Total Daily Energy Expenditure based on age, weight, height, and activity level. |
| Test Your Typing Speed | Measure WPM, accuracy, and consistency with timed typing tests |
| Waist-to-Hip Ratio Calculator | Calculate WHR with WHO risk classification and waist circumference assessment |
| Water Intake Calculator | Calculate your recommended daily water intake |
Yes; all health tools are free with no registration.
Extremely. Your weight, height, age, and other body measurements are processed entirely in your browser. We do not collect, store, or transmit any health data. This is not just a privacy policy; it is an architectural decision. There is no server endpoint to send data to.
The calculators use peer-reviewed formulas (Mifflin-St Jeor for BMR, WHO classifications for BMI, etc.). However, they provide general estimates, not medical diagnoses. Individual factors like medical conditions, medications, and genetics affect your actual needs. Consult a healthcare professional for personalized advice.
The tools do not store history. Write down your results or use a spreadsheet to track changes. This is intentional; we avoid storing personal health data.
Yes. You can switch between kg/cm and lbs/inches in every health calculator. The conversion is handled automatically.
BMI calculators for adults use adult formulas that are not appropriate for children. Pediatric BMI requires age-specific and sex-specific percentile charts. We recommend consulting your pediatrician for child health metrics.
Because different formulas exist. We use Mifflin-St Jeor, which is considered the most accurate for most people. Harris-Benedict, which is older, tends to overestimate slightly. The tool states which formula it uses.
Test Your Typing Speed
Measure WPM, accuracy, and consistency with timed typing tests
Blood Alcohol Calculator
Estimate BAC with multi-drink timeline, Watson formula, and safe-to-drive countdown
4-7-8 Breathing Timer
Guided breathing exercise with animated circle, progressive difficulty, and streak tracking
Missing something?
Tell us what tool you're looking for and we'll build it for you. We love new ideas!