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Free · No install · Runs on your phone's sensors

Online Inclinometer — Calculate Angles on Your Smartphone Surface

Use your smartphone to create an online spirit level. Measure angles instantly, reset surfaces, and ensure that all your measurements remain confidential on your smartphone.

Pitch (X) Roll (Y) On-device only
Idle PITCH · ROLL
Place your device flat on the surface to begin
Pitch · X-axis
0.0°
Roll · Y-axis
0.0°
However, most laptops and desktop computers lack the motion sensors required for this test; use your mobile device and access this page from it to begin.

How It Works

How to use this online inclinometer

Three steps cover almost every measurement.

01

Grant sensor access

Tap 'Start', and your browser will ask for permission to access motion and orientation data. No data is transmitted.

02

Lay the phone flat

Place it on the surface you need to test. The readings will be constantly updated while you move the device.

03

Zero and read

Press "Zero" to use the present angle as a reference point, then measure the pitch and roll up to a tenth of a degree.

Features

Built for real angle-measuring work

A simple digital level that won't burden you with an overly complex application full of registration and ads.

Real-time pitch & roll

The accelerometer and gyroscope readings are constantly read, so the screen follows your movements immediately.

Zero calibration

Choose any surface as the reference for 0° — great for comparing two surfaces or leveling off a camera bump.

Audio feedback

Enable 'beep when level' in settings and verify alignment by listening without looking at the screen.

100% on-device

All sensor data is processed entirely in the browser. No upload, storage or sharing of data.

Pro Tips

Get a more accurate reading

Two simple techniques cancel out most of a phone's built-in sensor error.

8° 180° 10°

180° rotation method

Neutralize any sensor bias by using an average of two contrasting measurements.

  1. Place the phone on the surface and note the reading (e.g. 8°).
  2. Rotate it 180° in the same spot and take a second reading (e.g. 10°).
  3. Average the two: (8 + 10) ÷ 2 = 9° — your corrected angle.
0° Zeroed 10° diff.

Zero-point calibration

Set the current surface as your new 0° baseline.

  1. Lay the device on your reference surface and let it settle.
  2. Press Zero — the current tilt becomes your new baseline.
  3. Move to the target surface; the readout now shows the difference.
5° · false tilt ZERO 0° · calibrated

Compensate for a camera bump

Cancel out the tilt a raised camera lens creates on a flat surface.

  1. Place the phone down — a camera bump often shows a false few-degree tilt.
  2. Press Zero to treat that tilted rest position as 0°.
  3. Every reading from here on is measured relative to true flat.

Use Cases

When this inclinometer helps

Anywhere you'd normally reach for a spirit level or clinometer.

Construction & carpentry

Check walls are vertical, floors are level, and rafters are cut to the right roof pitch.

Solar panel installs

Set panels to the optimal tilt for your latitude and season to maximize output.

DIY & home improvement

Hang frames straight, level furniture, and set up appliances so they don't vibrate.

Photography

Level a tripod before a shoot — critical for architectural and panoramic work.

Vehicles & RVs

Check suspension angles or level a caravan so fridges and drains work correctly.

Plumbing & drainage

Confirm pipes hold a consistent gentle slope to keep water flowing the right way.

FAQ

Online inclinometer FAQ

Straight answers about accuracy, privacy, and using this tool.

How do I use this online inclinometer?+
Grant sensor access, click "Start Measuring" and put your device on the surface. Inclination angles (X-axis) and tilt angles (Y-axis) will update live. Press Zero to define a reference point.
How precise is this inclinometer?+
The accuracy is limited by the quality of the accelerometer of your device. It's definitely enough for home projects; for professional use, get a professional level.
Is my data private?+
Yes. Your sensor data is analyzed live in your browser — we don't save any measurement results and don't transfer anything to our server.
What is it good for?+
Photography, solar panel installation, construction work, carpentry, vehicle leveling, plumbing, and any other job requiring angle measurement.
How do I account for the bump under the camera lens?+
Place the phone flat, notice the wrong result and press Zero — the tilted position becomes your new 0 degrees.
Do I have to install an app?+
No. This tool works completely in your mobile browser — you don't need to download any application from app stores.

100% private and secure

All sensor data is processed on your device. Nothing is ever sent to our servers.

Ready to check an angle?

Open the tool, place your phone on the surface, and read the tilt in seconds.

Start Measuring