Auralo › Free tools
Free tools
Six small calculators for sleep, caffeine, training and water. Each one shows its formula and sources, runs in your browser and saves nothing. Auralo does all of this for you every day, from your own data.
Bedtime calculator
Your wake-up time and sleep need, turned into a bedtime and a wind-down time.
Sleep need estimator
Your age and activity, turned into a sleep range and a starting point to test.
Caffeine cutoff calculator
Your bedtime and your usual drink, turned into a last-coffee time.
Zone 2 heart rate calculator
Your age and resting heart rate, turned into a zone 2 range, two ways.
Daily water calculator
Your weight, workout and the weather, turned into today's water.
HRV by age
Typical rMSSD for your age, with sources, and why your own baseline matters more.