4 free tools
Lifestyle calculators
Explore lifestyle tools with adjustable inputs, formulas, assumptions and worked examples. Choose a calculator below to see its method and limits.
Dog Age in Human Years
Convert your dog's age to human years using the epigenetic clock model.
Open calculator →Carbon Footprint (Driving)
Calculate your annual CO₂ emissions from driving and how many trees to offset.
Open calculator →Sleep Cycle Calculator
Find the best bedtime to wake up refreshed at your target wake time.
Open calculator →Habit Streak & Formation
Calculate how long to form a new habit and track your streak value.
Open calculator →