Planning tool
Battery Anxiety Calculator
A power-budget estimate for multi-day trips with no reliable charging.
Will my phone still be alive on day three? Most hikers answer that by carrying too much power bank, or by rationing their navigation and photos out of fear. Neither is necessary.
Enter your phone size, the days off-grid, how heavily you use it, your other devices and the expected temperature. You get a total power need in mAh, a recommended power bank size, and the weight that comes with it.
A real mAh budget
Your phone, watch, headlamp, e-reader and camera across the days you will be away from a socket.
Cold is accounted for
Below freezing, batteries lose capacity. The estimate adjusts instead of pretending they do not.
Solar, honestly
If you plan to carry a panel, it tells you what that realistically buys you — and what it does not.
Nothing stored
No account data, no gear profile saved. The calculation happens in your browser.
Members only — free
Use the Battery Anxiety Calculator
Free for GHO members. Sign up and we'll bring you straight to the tool.
Estimates based on typical device capacities and conversion losses. Carry a margin on remote or winter routes.