BMR & Basal Metabolic Rate Calculator
Calculate your daily baseline calorie burn using the Mifflin-St Jeor scientific formula.
Open Tool →
Wellness Hub · 100% In-Browser Privacy
Health & Daily Living Tools Hub
Calculate metabolic rates, caloric requirements, 90-minute sleep cycles, hydration goals, and fasting intervals without uploading sensitive biometric or health markers to external servers. All physiological models execute locally in your browser memory.
Tools Grouped by User Purpose & Intent
Showing all tools in this category (12)
1. Basal Metabolism, Energy Expenditure & Body Composition
Calculate baseline calories burned at rest (BMR), estimate total daily energy expenditure with physical activity (TDEE), gauge body fat percentage using US Navy metrics, and project active workout calorie burns.
TDEE & Daily Calorie Maintenance Calculator
Calculate Total Daily Energy Expenditure and macro splits for cutting, bulking, or maintenance.
Open Tool →
US Navy Body Fat & Lean Mass Calculator
Estimate body fat percentage and lean muscle mass using tape circumference measurements.
Open Tool →
Activity & Exercise Calorie Burn Calculator
Estimate calories burned during running, cycling, swimming, and weightlifting using MET values.
Open Tool →
2. Sleep Cycles, Circadian Rhythms & Fasting Schedules
Time your wake-up and bedtimes according to natural 90-minute REM sleep cycles, track total sleep needs, configure intermittent fasting eating windows (16:8, 20:4), and calculate daily water hydration.
Optimal Bedtime & Wake-Up Sleep Calculator
Plan approximate sleep and wake schedules using 90-minute reference cycles.
Open Tool →
90-Minute Sleep Cycle Calculator
Calculate natural 90-minute sleep cycles to schedule restorative power naps and full night sleep.
Open Tool →
Intermittent Fasting 16:8 & OMAD Timer
Track fasting and eating windows for 16:8, 18:6, 20:4, and OMAD fasting protocols.
Open Tool →
Daily Water Intake & Hydration Calculator
Calculate optimal daily fluid requirements based on body weight, climate, and workout intensity.
Open Tool →
3. Focus Intervals, Daily Transit & Milestone Planning
Maintain peak mental focus using Pomodoro work-rest sprints, calculate accurate pregnancy delivery due dates, track prayer times, and evaluate the financial cost of daily vehicular commuting.
Pomodoro Focus Timer & Work Tracker
Boost productivity with structured 25-minute focus intervals and restorative rest breaks.
Open Tool →
Pregnancy Due Date & Trimester Calculator
Calculate your estimated baby due date, current gestational week, and trimester milestones.
Open Tool →
Islamic Prayer Times & Qibla Direction
Calculate daily prayer schedules via Aladhan API and astronomical solar calculation methods.
Open Tool →
Commute Cost & Hybrid Work Savings Calculator
Calculate annual fuel, transit, and depreciation expenses from your daily work commute.
Open Tool →
Quick Selection Guide: Which Tool Do You Need?
Find out exact resting calories burned just staying alive
Applies Mifflin-St Jeor formula based on age, gender, and weight.
BMR Calculator →Calculate total daily calories to maintain, lose, or gain weight
Multiplies BMR by real activity multiplier for customized calorie targets.
TDEE Calculator →Estimate body fat percentage without specialized calipers or scales
Accurate neck, waist, and hip circumference regression modeling.
Body Fat Calculator (Navy) →Determine what time to sleep or wake up without grogginess
Calculates complete 90-minute REM intervals to prevent sleep inertia.
Sleep Cycles Calculator →Calculate how many liters or ounces of water to drink each day
Factors body weight, ambient climate, and exercise sweat loss.
Water Intake Calculator →Track 16:8 or 20:4 intermittent fasting intervals and eating windows
Visual countdown timer for fasting and digestion rest periods.
Fasting Scheduler →Structure deep work focus blocks with structured rest periods
Classic 25-minute sprint and 5-minute break cycles with sound cues.
Pomodoro Timer →Calculate expected delivery date based on last menstrual period
Applies Naegele's rule to forecast trimester milestones and due dates.
Pregnancy Due Date →Real Technical Limitations & Browser Constraints
Non-Clinical General Modeling
Calorie, BMR, and body fat calculations use standard statistical formulas (Mifflin-St Jeor, US Navy). They are designed for educational wellness modeling, not certified clinical diagnosis or medical prescriptions.
Individual Sleep Architecture Variance
The 90-minute REM cycle model is an empirical population average. Individual sleep architecture fluctuates with age, alcohol, caffeine intake, and physical exhaustion.
Obstetric Date Variance
Pregnancy due date calculations use Naegele's rule based on a regular 28-day cycle. Variations in ovulation timing naturally shift actual delivery dates.
Explore Other Category Hubs
View all categories →
15 tools
PDF & Document Tools Hub
Free client-side PDF tools to merge, split, compress, protect, and organize documents directly in your browser. Complete selection guide, technical limits and workflows.
30 tools
Image & Graphic Design Tools Hub
Client-side image tools to compress, resize, crop, convert, and optimize images privately in your browser. Format guides, technical limits, and workflows.
28 tools
Audio & Video Tools Hub
Free in-browser audio and video tools: convert video to MP3, trim sound files, cut clips, screen record, remove silence, and edit ID3 tags without server uploads.
10 tools
Text Tools & String Utilities Hub
Free client-side text tools: count words, convert letter case, clean duplicate lines, compare text diffs, format markdown, and convert HTML entities without server logging.
33 tools
Developer Tools & Code Utilities Hub
Fast, client-side developer utilities: JSON formatter, Base64, SQL, RegEx, JWT, Diff, Cron, and crypto tools. Zero server transmission.
22 tools
Finance & Investment Calculators Hub
Free client-side financial calculators: plan loan repayments, mortgage amortization schedules, compound interest growth, FIRE retirement, inflation adjustments, and currency conversions.
19 tools
Business & Freelance Tools Hub
Free client-side business tools: generate printable invoices, calculate gross margins and VAT, estimate freelance hourly rates, analyze ad ROAS, and track SaaS metrics.
11 tools
Units, Date & Time Calculators Hub
Free client-side measurement and time tools: convert metric and imperial units, calculate date spans, track Schengen 90/180 visa days, compare international clothing sizes, and view world timezones.
8 tools
QR & Generator Tools Hub
Free client-side generators: create custom QR codes, generate secure passwords, batch UUID v4, cryptographic hashes, RSA key pairs, and offline OCR recognition.