How accurate is the altitude reading?

GPS-based altitude is typically accurate to within 5–15 metres. If your device also has a barometric pressure sensor, the altimeter can use it to improve accuracy, often to within 2–3 metres on a calibrated reading.

Does it work offline?

Yes. GPS and barometric sensors work without any internet connection. The tool only needs a clear view of the sky for a GPS signal — no data connection is required.

Why is my altitude reading changing indoors?

GPS signals are weaker indoors, causing drift in the reading. Barometric pressure also changes with weather and HVAC systems, so small fluctuations indoors are normal.

Is my location data stored or shared?

No. The tool reads your device's location sensor in real time only. No location data is logged, stored, or sent to any server.

Altimeter

APP

Read your current altitude.

Best on the app

Altimeter needs your phone's hardware

It uses the barometer and GPS. Download Carbide free to use it — plus all 111 tools, fully offline.

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What it does

Altimeter reads your current elevation above sea level using your device's GPS, barometric pressure sensor, or both, and displays it continuously as you move. Hike up a trail and watch the altitude climb in real time; check your elevation at a mountain pass; verify the height of a building floor. It shows your altitude in metres or feet, along with the current atmospheric pressure if your device has a barometer. The tool is free, runs entirely offline once you have a GPS fix, needs no sign-up, and keeps everything on your device — your location data is never sent anywhere. It's a simple, always-available reference for anyone who wants to know exactly how high up they are.

How to use the Altimeter

Open Altimeter and allow location access so the tool can use your GPS signal.
Wait a few seconds for your device to lock onto GPS satellites — the altitude reading will appear.
Read your current altitude displayed in metres or feet on the main screen.
Move to a higher or lower position and watch the reading update in real time.
Switch between metres and feet using the unit toggle if needed.

Frequently asked questions

How accurate is the altitude reading?: GPS-based altitude is typically accurate to within 5–15 metres. If your device also has a barometric pressure sensor, the altimeter can use it to improve accuracy, often to within 2–3 metres on a calibrated reading.
Does it work offline?: Yes. GPS and barometric sensors work without any internet connection. The tool only needs a clear view of the sky for a GPS signal — no data connection is required.
Why is my altitude reading changing indoors?: GPS signals are weaker indoors, causing drift in the reading. Barometric pressure also changes with weather and HVAC systems, so small fluctuations indoors are normal.
Is my location data stored or shared?: No. The tool reads your device's location sensor in real time only. No location data is logged, stored, or sent to any server.

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