Altitude Meter

What is Altitude Meter?

The Altitude Meter reads the GPS sensor on your phone or laptop and shows your elevation above sea level in meters or feet. The reading updates live as you move uphill or downhill, and you can copy the latitude, longitude, and altitude as one line of text.

GPS altitude comes from the same satellite fix that gives latitude and longitude. Vertical accuracy is usually 3-10x worse than horizontal, so a reading around 450 m might really be anywhere from 440 to 460 m. To get a steadier number, stay outdoors with a clear view of the sky for 20-30 seconds before trusting the value.

How to use

1. Allow location access when prompted by your device
2. Wait a moment for the GPS signal to lock on
3. Read your current altitude displayed in meters or feet

When to use

• Recording the elevation of a hiking summit, viewpoint, or campsite for a trip log.
• Checking cabin pressure expectations before a long drive or bike ride into the mountains.
• Comparing how high above sea level different rooms in a building actually are.

Result

Standing at the top of a hill, see your elevation read 450 meters above sea level in real time.

FAQ

Why does my altitude reading jump around when I'm standing still?

GPS altitude is calculated from satellite geometry, which fluctuates as satellites move across the sky. Indoor walls, dense trees, and tall buildings make it worse. Wait 20-30 seconds in the open and the value usually settles within a 5 m band.

Is GPS altitude the same as the height shown on a topographic map?

Not exactly. Map elevations use a reference surface called the geoid; GPS uses an ellipsoid model. The two can differ by 30 to 50 m. For most outdoor uses this is fine, but surveyors apply a correction to match map values.

My phone shows N/A or blank for altitude. Why?

Some devices report only horizontal position and omit altitude, especially older laptops or phones with Wi-Fi-only positioning. Mobile phones outdoors with cellular and GPS enabled almost always return a value.

Does the tool use a barometer if my device has one?

The web Geolocation API does not expose barometric data, so altitude comes purely from GPS. Native barometer-aware apps can be more accurate, but they need raw sensor access that browsers do not grant.

Do you log my location data?

No. Coordinates and altitude are read from your device and displayed on the page. Nothing is sent to a server. If you copy the values, they go to your clipboard and stay there.

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