Level
Lay your phone flat or stand it on an edge. It works out which by itself, and the bubble moves to the higher side.
This device has no tilt sensor. Open the page on your phone; here you can drag the level to see how it works.
Tap to hold the reading
How to use the phone level
Lay the phone on a surface and the round bubble shows both directions at once: how much higher the right side and the top of the phone are. Stand the phone on one of its edges and the level becomes a tube, like a carpenter’s spirit level. It works out which by itself, and standing up, the drawing turns to stay upright for whoever holds it.
When it is level, the number reads 0.0° and the marks turn green.
- Full screen makes the level bigger and keeps the screen on. A tap holds the reading.
- Zero here measures from the surface the phone is on, to make one shelf match another.
- Hold freezes the number, to read it after taking the phone from somewhere you could not see the screen.
- Sound beeps and vibrates when it reaches level, for when the screen is out of sight.
How to hang a picture straight
Stand the phone on its side on top of the frame and turn the picture until the bubble sits between the marks. If the frame is thin, hold the phone against its bottom edge instead. To mark two holes on the wall, rest the phone on a ruler between the marks.
Degrees, percent and millimetres per metre
The level shows the slope three ways. In degrees, as on a protractor. In percent, the usual way to give the slope of a floor or a ramp: 1% is 1 cm of drop for every metre. And in millimetres per metre, which helps to see how uneven a floor is: 5 mm/m across a 4 m room is 2 cm from one wall to the other.
| Degrees | Percent | Millimetres per metre |
|---|---|---|
| 0.5° | 0.9% | 8.7 mm/m |
| 1° | 1.7% | 17 mm/m |
| 2° | 3.5% | 35 mm/m |
| 5° | 8.7% | 87 mm/m |
Questions
- How accurate is a phone level?
- The reading comes in tenths of a degree. What limits it is the phone's sensor, which can be off by a few tenths of a degree from the factory. Once calibrated, it is good enough to hang a picture or check a floor or a shelf. For laying tiles, check with a real spirit level.
- How do I calibrate it?
- Lay the phone on a firm surface, tap "Calibrate" and wait for the reading. Then turn the phone 180° on the same spot and tap again. The correction is kept in this browser and also applies with the phone standing up.
- Does it work on an iPhone?
- Yes. The first time, Safari asks for permission to read the sensors, and you tap "Turn on the level". Safari cannot lock the screen upright, but the drawing turns by itself to stay upright for you.
- Does it work on a computer?
- Only if it has a tilt sensor, like some tablets and fold-over laptops. Without one, you can drag the level to see how it works.
- Does any measurement leave my phone?
- No. Everything is worked out in your browser, and the page is not allowed to open any connection. Only the calibration is kept, in this browser.
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Made by Ronaldo Sena, a developer in Uberlândia, Brazil, who also writes about code and chess on the blog.