What Is My Elevation? Altitude Above Sea Level
Your device's reported altitude with its error range, plus a feet and metres converter. It runs in your browser and sends nothing.
How this is calculated
This page shows the altitude your device reports, with the error range the device reports, and converts between feet and metres. It does not look up ground elevation from a map database.
- When you press the button, your browser asks for permission and may return an altitude and an altitude accuracy, both in metres. MDN says either can be null, and many computers, and some phones, return nothing. In that case the page says so and shows no number.
- The altitude is converted to the unit you chose: feet = metres ÷ 0.3048, because the international foot is defined as exactly 0.3048 m. Metres = feet × 0.3048.
- The result is rounded to the nearest whole foot or metre. The error range is converted and rounded the same way, and is shown as plus or minus the accuracy your device reported. MDN defines that accuracy as metres at 95% confidence.
- The converter on this page does the same arithmetic on a number you type, so 100 m shows as 328 ft and 1,000 ft as 305 m.
Nothing is sent to our servers. The page makes no request when you press the button, so your position stays in your browser.
Elevation, altitude and height
In everyday use, elevation and altitude both mean height above sea level. The browser's Geolocation API reports an altitude figure in metres and an optional accuracy, and it does not say how the device produced the number or what it is measured from. A map's elevation is a different thing: the height of the ground at a point, taken from survey or elevation-model data. For that reason the device reading on this page is labelled a device altitude and is not presented as ground elevation, and the two may not agree.
The error range your device reports is the best guide to how far to trust the figure. If it reports no range, treat the number as a rough indication only. If your device reports no altitude at all, the page will not make one up.
If the reading looks wrong
Altitude can change between readings, and it can be missing altogether. Moving a few metres, going outdoors or waiting for a fresh reading can change what the browser returns. The page shows whatever the browser reports and cannot correct it.
For a hike or a flight, use a dedicated instrument or a map that states its elevation source. For a quick check, the device figure plus its error range is a start. To see where you are in the first place, go to the home page, or read your coordinates on the coordinates page.
Feet and metres
| Metres | Feet |
|---|---|
| 10 | 33 |
| 100 | 328 |
| 500 | 1,640 |
| 1,000 | 3,281 |
| 3,000 | 9,843 |
For speed in other units, there is a GPS speed readout. If the position looks wrong, why your location may be wrong explains the usual causes.
Where the figures come from
- MDN, GeolocationCoordinates (accuracy is in metres at 95% confidence). Checked 9 November 2026.
- NOAA National Geodetic Survey, the international foot (0.3048 m). Checked 9 November 2026.
- NIST Handbook 44 (2024), Appendix C, general tables of units of measurement. Checked 9 November 2026.