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Measured AngleAcute
45.00°(Outer: 135.00°)
Ready: Drag angle arm handle or vertex to measure. Output updates continuously.
Digital Compass & Level
Compass & Inclinometer
Real-time digital compass heading and dual-axis spirit level to measure tilt, elevation, and surface pitch.
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STEP 1
Move center circle to angle corner, then rotate arm to match edge.
Angle45.0°
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Comprehensive Geometry & Engineering Handbook
Online Free Protractor & Screen Ruler · onlinefreeprotractor.com
✓ 100% Client-Side Private · Local RAM
⠿📏 Screen Ruler
Dist: 0.00 cmDrag Blue Center to vertex · Drag Arm Handle to rotate
⠿💳 Card
85.60 × 53.98 mmScale: 100 px = 10.0 cm
Bubble Level
MEASURED ANGLE OUTPUT
45.00°
ACUTE
Outer: 135.00° · 0.7854 rad
Supplementary
135.00°
Complementary
45.00°
Trigonometric Ratios
sin: 0.7071 · cos: 0.7071
Device Calibration
113.0 PPI · 1:1 Scale
RECORDED ANGLE PINS
| # | Angle (Deg) | Radians | Type |
|---|
Primary ScaleInner Scale
45.00°Acute
Outer Scale135.00°
Angle Relationships
Supplementary (180°-θ):135.00°
Complementary (90°-θ):45.00°
Reflex (360°-θ):315.00°
Trigonometric Values
sin(θ):0.7071
cos(θ):0.7071
tan(θ) (Slope):1.0000
Circle Geometry
Arm Radius:200 px
Arc Length:157.08 px
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Recorded Measurements0 Pins
| # | Label | Degrees | Radians | Class | Action |
|---|---|---|---|---|---|
| No pinned angles yet. Click canvas to place ray pins or click "+ Save Reading". | |||||
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Sensor Guide
How to Use Compass & Surface Level
Turn any smartphone, tablet, or laptop into a precision navigational heading instrument and spirit level.
01
Enable Device Motion Sensors
Click Enable Device Sensors. On mobile Safari / iOS, tap Allow to grant gyroscope and magnetometer orientation access.
DeviceOrientation API
02
Hold Flat for Azimuth Heading
Hold your device horizontally flat to read true azimuth bearings (0° North, 90° East, 180° South, 270° West) and lock target courses.
Cardinal & Intercardinal Points
03
Measure Surface Incline & Level
Lay your device edge along a shelf, table, or solar panel to read pitch and roll angles. Press Zero 0° Level for relative measurements.
0.1° Digital Bubble Level
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Compass Support
Compass & Inclinometer FAQs
Common questions regarding device orientation permissions, pitch, roll, and spirit level calibration.
Why does iOS Safari ask for permission to use motion sensors?↓
Apple requires explicit user authorization via a button click before a website can access accelerometer and gyroscope hardware on iPhone and iPad. Clicking Enable Device Sensors triggers this prompt safely.
What is the difference between Azimuth, Pitch, and Roll?↓
Azimuth (Heading) is the horizontal compass bearing from 0° (North) to 360°. Pitch is the front-to-back incline tilt angle of the device. Roll is the side-to-side rotation angle used for horizontal spirit level alignment.
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Can I use this on a desktop PC or laptop without motion sensors?↓
Yes. On desktop computers without physical accelerometers, an interactive Heading Slider and quick cardinal buttons (N, E, S, W) allow you to simulate any navigational bearing effortlessly.
What does the Zero 0° Level button do?↓
The Zero 0° Level button tares the current surface angle to 0.0°. This allows you to measure relative angles between two sloping surfaces, such as checking whether a shelf is parallel to a sloping floor.