All Calculators
Science-based tools to help you understand and optimize your health. All calculators are free, private, and require no account.
BMI Calculator
Calculate your Body Mass Index to understand your weight status relative to your height with detailed insights.
Caffeine Half-Life Tracker
Track caffeine intake and calculate remaining levels in your system to predict effects on sleep and alertness.
Alcohol Sleep Impact Calculator
Quantify the negative impact of alcohol consumption on sleep quality and duration with science-backed metrics.
Circadian Rhythm Predictor
Forecast daily energy peaks and troughs based on your circadian rhythm and recent sleep data.
Sleep Apnea Risk Quiz
A simple screening tool that assesses key symptoms to estimate your risk of having sleep apnea.
Sleep Debt Calculator
Track your accumulated sleep deficit and discover how long you need to recover. Understand the health impact of sleep deprivation.
Nap Optimizer
Find the perfect nap duration and timing based on your schedule and goals. Power nap, recovery nap, or full cycle.
Jet Lag Recovery
Get a personalized day-by-day schedule to minimize jet lag with optimal light exposure timing and sleep adjustments.
TDEE Calculator
Calculate your Total Daily Energy Expenditure and get personalized calorie and macro targets for your goals.
Macronutrient Calculator
Calculate your ideal protein, carb, and fat ratios based on your goals. Choose from preset diets or customize your own macro split.
Water Intake Calculator
Calculate your optimal daily water intake based on weight, activity, climate, and lifestyle. Get a personalized hydration schedule.
Body Fat Calculator
Estimate your body fat percentage using the US Navy method or BMI formula. See fat mass, lean mass, and fitness categories.
One Rep Max Calculator
Calculate your one rep max from any weight and rep count. Get a training load chart with percentages for strength and hypertrophy.
Calorie Burn Calculator
Calculate calories burned during any activity. Choose from 30+ exercises with accurate MET-based calculations and weekly projections.
Intermittent Fasting
Plan your fasting schedule with 16:8, 18:6, 20:4, or OMAD protocols. Track your progress in real-time with live countdown.
Biological Age Calculator
Discover your body's true age based on lifestyle factors. See how exercise, sleep, stress, and diet affect how fast you're aging.
Heart Risk Calculator
Estimate your 10-year cardiovascular disease risk based on the Framingham Risk Score. Get your heart age and health recommendations.
Smoking Cessation ROI
Calculate the financial and health benefits including money saved and life years regained from quitting smoking.
Stress Score Calculator
Assess your stress level across 10 life factors. Identify your biggest stressors and get personalized coping strategies.
Screen Time Impact
Calculate how your daily screen habits affect your health. Get a breakdown by category and personalized digital wellness tips.
More Calculators Coming Soon
We're constantly adding new science-based calculators. Check back soon for tools covering nutrition, fitness, mental health, and more.