Sleep Cycle Calculator – Calculate Your Optimal Sleep Times
Sleep cycle calculator helps you wake refreshed. Calculate optimal 90-minute sleep cycles, BMI, calories, hydration, macros, heart rate zones and more — all science-backed tools in one trusted place.
Sleep Cycle Calculator and More Free Health Tools
Our sleep cycle calculator is the #1 free tool to optimize your sleep schedule. Calculate when to sleep and wake using 90-minute REM cycles.
Beyond our sleep cycle calculator, we offer 8 additional free health calculators for BMI, calories, macros, hydration, and more.
Sleep Cycle Calculator Plus 8 More Free Health Tools
Calculate. Know. Improve.
All calculations run in your browser with zero ads. We never collect or store your personal data.
Sleep Cycle Calculator – REM Sleep Timing Tool
Sleep cycle calculator – Calculate optimal sleep and wake times using 90-minute cycles. This tool helps you wake between REM sleep cycles — not mid-REM — so you feel refreshed, not groggy. Enter your wake time or bedtime and get the ideal sleep windows ranked for you.
📊 Sleep Cycle Chart: Visualize your 90-minute sleep cycles to wake at the optimal time
Calculate Sleep Times Using Sleep Cycle Calculator
Sleep Cycle Calculator – Plan Your Bedtime
📊 BMI Calculator – Body Mass Index
Calculate your BMI with our free body mass index calculator. Get your exact BMI score, health category, and healthy weight range instantly.
Calculate BMI Using Metric Units
Calculate Body Mass Index in Imperial Units
🔥 Calorie Calculator & TDEE Calculator
Use our calorie calculator to find your daily calorie needs and TDEE (Total Daily Energy Expenditure). Get personalized weight-loss and muscle-gain targets using Mifflin-St Jeor formula.
Enter Your Details to Calculate Daily Calorie Needs
💧 Water Intake Calculator – Hydration Calculator
Calculate your daily water intake and hydration needs. Our water calculator personalizes recommendations based on your body weight, activity level, and climate.
Calculate Your Daily Hydration Requirements
🍽️ Macro Calculator – Macronutrient Split Calculator
Use our macro calculator to calculate protein, carbs and fat macronutrient splits in grams. Get customized macros for your fitness goal and diet style.
Calculate Your Personalized Macronutrient Split
❤️ Heart Rate Zone Calculator – Training Zones
Calculate your heart rate zones for training. Our heart rate calculator shows all 5 training zones using Karvonen method for fat burn, cardio, threshold and peak performance.
Calculate Your Heart Rate Training Zones
📏 Body Fat Percentage Calculator – Body Fat Estimator
Calculate your body fat percentage using the US Navy body fat calculator method. Get accurate body fat estimates without calipers or DEXA scan.
Calculate Your Body Fat Percentage Using Accurate Methods
🥚 Daily Protein Calculator – Protein Needs Calculator
Calculate your daily protein intake. Our protein calculator shows how many grams per day you need based on your body weight and fitness goal.
Calculate Daily Protein Requirements for Your Goal
⚖️ Ideal Body Weight Calculator
Calculate your ideal body weight. Our ideal weight calculator shows the healthy weight range for your height using Hamwi, Devine & Robinson clinical formulas.
Calculate Your Ideal Body Weight in Metric Units
Calculate Ideal Weight Using Imperial Measurements
About WellRoot – Sleep Cycle Calculator & Health Tools
Built by health professionals, for everyone
WellRoot created the sleep cycle calculator to help you wake refreshed and energized.
WellRoot was founded by a team of certified nutritionists, physiotherapists and data scientists.
Every calculator is validated against peer-reviewed research.
Every article is reviewed by a licensed health professional before publication.
We believe accurate health information should be free and easy to understand.