Free health tools for better everyday decisions.
Calculate, plan and understand everyday questions about sleep, walking, exercise, recovery, shift work and ergonomics using transparent, evidence-informed tools.
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Steps to Calories
Calories, distance and walking time
Walking Weight Loss
Walking energy and weight-loss equivalent
Sleep Calculator
Bedtime and wake-up planning
Desk Ergonomics
Workstation and monitor positioning
Running Training Load
Mileage, symptoms and injury history
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DoctorToolsMD groups tools around four practical areas: sleep, work, ergonomics and general health.
Sleep Tools
Sleep timing, caffeine, shift-work and recovery calculators.
Work Tools
Tools for shift workers, desk workers and healthier work routines.
Ergonomics Tools
Workstation, posture and sitting tools for more comfortable daily work.
Health Tools
Doctor-informed tools for exercise, recovery, walking and musculoskeletal health.
Popular calculators
Useful tools for everyday health questions
Start with one of our most useful calculators for walking, sleep, exercise, recovery or ergonomics.
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.
Desk Ergonomics Calculator
Estimate desk, monitor and workstation positioning from your seated measurements.
Posture & Musculoskeletal Risk Analyzer
Review sitting duration, workstation setup, movement and neck, back, shoulder and hand symptoms.
Orthopedic Injury Recovery Calculator
Explore broad evidence-informed recovery windows for selected orthopedic injuries and clinician-provided estimates.
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 tools
Turn your daily walking into useful numbers.
Estimate calories, distance and walking time from your steps, then explore how a regular walking plan may contribute to energy expenditure and weight management.
How our tools are built
More than a number on a screen
A useful health calculator should explain what it is calculating, where its assumptions come from and what the result cannot tell you.
Doctor-informed
Tools are designed with health context and safety limitations in mind.
Transparent
We explain assumptions, formulas and limitations instead of hiding them.
Practical
Calculators are designed around questions people actually ask in everyday life.
Safety-aware
Important symptoms should always take priority over a calculator result.
Health calculators are educational tools
DoctorToolsMD calculators can provide useful estimates and structured information, but they cannot diagnose disease, perform a physical examination or replace individualized medical advice.
Read Medical DisclaimerLearn how we build the tools
Read about the site, editorial approach, evidence sources and the principles used when creating DoctorToolsMD calculators.
About DoctorToolsMDExplore all 17 DoctorToolsMD tools
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