FitOnear // Instrument Panel
Biohacking Toolkit
Five calculators built for optimizing your biology — metabolism, fasting, sleep, hydration, and training zones. Enter your numbers and get an instant readout.
TDEE & BMR Calculator
Your Basal Metabolic Rate, Total Daily Energy Expenditure, and calorie targets with a macro split, using the Mifflin-St Jeor equation.
Live readout
BMI —Estimate only, not medical advice — adjust based on real-world results over 2–3 weeks.
→ A food scale makes hitting these numbers effortless
Intermittent Fasting Timer
Pick a protocol, set your fast start time, and track your live progress through the fasting and eating windows.
Sleep Cycle Calculator
Sleep cycles run ~90 minutes. Waking up between cycles (not mid-cycle) means less grogginess. Allow ~15 min to fall asleep.
Daily Water Intake Calculator
A baseline hydration target based on your body weight, activity, and climate.
→ A marked smart bottle makes hitting this target automatic
Heart Rate Training Zones
Training zones based on estimated max heart rate (220 − age). Add resting heart rate for a more precise Karvonen-method estimate.
→ A chest strap monitor is far more accurate than wrist tracking for zone training
