Health calculators built to be useful, transparent and easy to understand.
Explore calculators and self-assessment tools for sleep, walking, exercise, recovery, shift work, ergonomics and musculoskeletal health.
5 tools
Sleep Tools
Sleep timing, caffeine, shift-work and recovery calculators.
5 tools
Work Tools
Tools for shift workers, desk workers and healthier work routines.
4 tools
Ergonomics Tools
Workstation, posture and sitting tools for more comfortable daily work.
11 tools
Health Tools
Doctor-informed tools for exercise, recovery, walking and musculoskeletal health.
Popular tools
Start with one of our most useful calculators
These tools cover some of the most common everyday questions around sleep, walking, recovery, ergonomics and exercise.
Sleep Calculator
Calculate suggested bedtimes or wake-up times using estimated sleep cycles and time to fall asleep.
Caffeine Half-Life
Estimate how much caffeine may remain in your body several hours after coffee, tea or another caffeine source.
Shift Sleep Planner
Plan sleep around night shifts, commute time, wind-down periods and optional naps.
Desk Ergonomics
Estimate desk, monitor and workstation positioning from your seated measurements.
Posture Risk Analyzer
Review sitting duration, workstation setup, movement and neck, back, shoulder and hand symptoms.
Injury Recovery
Explore broad evidence-informed recovery windows for selected orthopedic injuries and clinician-provided estimates.
Exercise Pain Analyzer
Assess exercise-related pain, function, swelling, workload changes and important warning symptoms.
Gamer Health
Review gaming time, sleep, physical activity, sitting, ergonomics, eye strain and musculoskeletal symptoms.
Running Load Calculator
Compare weekly mileage, longest run, frequency, harder sessions, previous injury and current symptoms.
Complete directory
All DoctorToolsMD calculators
Browse all 17 tools currently included in the launch catalog.
Sleep Tools
Sleep timing, caffeine, shift-work and recovery calculators.
Sleep Calculator
Calculate suggested bedtimes or wake-up times using estimated sleep cycles and time to fall asleep.
Caffeine Half-Life Calculator
Estimate how much caffeine may remain in your body several hours after coffee, tea or another caffeine source.
Shift Sleep Planner
Plan sleep around night shifts, commute time, wind-down periods and optional naps.
Sleep Debt Calculator
Compare your recent nightly sleep with your selected sleep target and calculate the arithmetic shortfall.
Sleep & Recovery Score
Review sleep duration, quality, training fatigue, soreness and recovery habits with an educational recovery score.
Ergonomics Tools
Workstation, posture and sitting tools for more comfortable daily work.
Desk Ergonomics Calculator
Estimate desk, monitor and workstation positioning from your seated measurements.
Sitting Break Calculator
Build a movement-break schedule around your workday, lunch period and preferred reminder interval.
Posture & Musculoskeletal Risk Analyzer
Review sitting duration, workstation setup, movement and neck, back, shoulder and hand symptoms.
Health Tools
Doctor-informed tools for exercise, recovery, walking and musculoskeletal health.
Orthopedic Injury Recovery Calculator
Explore broad evidence-informed recovery windows for selected orthopedic injuries and clinician-provided estimates.
Sports Injury Return-to-Play Calculator
Review pain, swelling, strength, mobility, function, confidence and training status before discussing return to sport.
Muscle & Strength Recovery Calculator
Estimate recovery context after strength training using session demand, soreness, sleep and readiness.
Knee Osteoarthritis Self-Assessment
Review knee pain, stiffness, walking, stairs, daily function and features that may overlap with osteoarthritis.
Exercise Pain & Injury Risk Analyzer
Assess exercise-related pain, function, swelling, workload changes and important warning symptoms.
Gamer Health Risk Calculator
Review gaming time, sleep, physical activity, sitting, ergonomics, eye strain and musculoskeletal symptoms.
Running Injury Risk & Training Load Calculator
Compare weekly mileage, longest run, frequency, harder sessions, previous injury and current symptoms.
Walking Weight Loss Calculator
Estimate walking calories, weekly distance and a rough energy-equivalent weight change from a regular walking plan.
Steps to Calories Calculator
Convert your daily steps into estimated calories, distance, walking time and calories per 1,000 steps.
Transparent calculations
Our calculators explain their assumptions, formulas, limitations and evidence sources wherever those details are relevant.
About DoctorToolsMDEducational, not a diagnosis
Health calculators can provide useful context, but they cannot diagnose disease, replace examination or override important symptoms and professional medical advice.
Medical disclaimer