Slope Percent Inclinometer

SLOPE PERCENT INCLINOMETER
Measure surface tilt in degrees and slope percentage with your phone's sensor. Rest the phone on a ramp, a drain, a terrace or a roof and read both values at once, updated live.

YOUR TRADE'S OWN UNITS
Switch the reading between degrees, slope percent, rise over 12 for roof pitch (4/12, 6/12), 1:n ratio for ramps, and radians. A 1:20 ramp reads 5 % and 2.9°; a 4/12 roof reads 18.4°.

RELATIVE ANGLE INCLINOMETER
Zero the inclinometer on a reference surface, then read how many degrees another surface differs in tilt from it. The difference is shown as a positive value and does not say in which direction. Useful for bevels, a tilted table saw blade, or a shelf that has to match an existing one.

TARGET ANGLE ALERT
Set the angle you are aiming for, 37° for a stair stringer for example, and the phone vibrates when you reach it. Both hands stay on the board.

WALL PLUMB MODE
Hold the phone upright against a post or a wall and read how far it leans from the vertical, instead of from the horizontal.

SCREEN PROTRACTOR WITH TWO ARMS
Use the on-screen protractor with two draggable arms to read angles by hand in real time. Next to the angle, the app shows its complement (90° minus the angle, up to 90°) and its supplement (180° minus the angle, up to 180°).

180 AND 360 DEGREE PROTRACTOR
Switch between half-circle 0-180° mode and full-circle 0-360° mode for different angle tasks.

MEASURE ANGLES ON PHOTOS AND IN THE CAMERA VIEW
Import a saved photo from your gallery and place the angle guides over the lines you want to measure. Or open the live camera view, line the two arms up with the real object, and capture the frame to keep measuring on it.

TWO AXIS BUBBLE LEVEL
Check left-right and front-back level at the same time with the two-axis bubble level.

SAVED ANGLE MEASUREMENTS
Save measurements with a date, label, angle value and measurement source, then export them as a CSV file to paste into a quote or a spreadsheet. Every unit is written on each line.

PRACTICAL USES
Roof slope checks, stair stringers, accessibility ramps, drainage slope, wall plumb, shelves, solar panel tilt, antenna tilt, and geometry diagrams for school.

OFFLINE AND WITHOUT AN ACCOUNT
The core measuring tools work offline and do not require an account.

ACCURACY AND LIMITATIONS
Sensor readings depend on your phone's accelerometer and on how flat the phone sits. Zero it against a reference surface before an important reading. The app is intended for practical school, DIY and workshop use, not certified metrology. It does not measure distance, height or area.

WHAT IS INCLUDED
The protractor, the inclinometer with slope percent and the two-axis level are usable without paying, with ads. Pro adds the camera view and photo measuring, holding a reading on screen, saved measurements with CSV export, the target angle alert, plumb mode, and removes the ads. The weekly plan starts with a 7-day trial. Ads stay during the weekly plan's 7-day trial and stop once it ends.

Recent changes:
The protractor now shows the true complement (90° minus the angle) and the supplement (180° minus the angle). The inclinometer reads the difference from the zeroed surface in both directions, and its saved readings can be named.