Frequently Asked Questions
Frequently Asked Questions
Find instant answers to common questions about angle accuracy, privacy, scale calibration, and file export.
Our protractor renders vector handles using 64-bit IEEE floating-point mathematics rendered at native Retina resolution. Combined with the 4x Loupe scope magnifier, it achieves positioning precision up to 0.01 degrees.
Yes! 100% of image decoding, canvas rendering, and vertex mathematics happen locally inside your web browser memory. No images or measurement data are ever uploaded to external cloud servers.
Select "Roof Pitch" in the protractor mode dropdown. Align the baseline and slope rays on your roof diagram. Smart Protractor will automatically output the rise-over-12-inch-run ratio (e.g. 6:12), slope grade percentage (50%), and incline angle (26.57°).