Calculators
Quick calculators
Your number, your elevation, your trip, your device and your nights, a minute each. Feet first, metres a tap away.
Your number, explained
Any reading, awake or overnight, on your device at your elevation: where it sits and what to do next.
Oxygen by elevation
Pick a town or an elevation: the oxygen in each breath, a normal night there and the risk of sleeping that high.
Is my trip going up too fast?
Each night's sleeping elevation against the CDC's pacing rules, the one change that fixes most, and a morning check.
Which device?
What a finger oximeter, a watch or a ring records, how far off each can be, and why two of them disagree.
The three-night check
A dated card for the next three nights: what to note each morning and when to bring it to a doctor.
Every number from 85 to 100
Tap a number: what it means awake, as an overnight average and as the lowest point of a night.
Wear your watch or ring to bed, and Gyroscope shows last night's blood oxygen beside your sleep every morning. Open Gyroscope
