How to use this pelvic angle converter
If you locate the bony points at the front and back of your pelvis and measure the height difference plus the front-to-back distance between them, those two numbers give the angle of tilt. Fill in the two left-side boxes for an angle, and add the right side to get the left-right gap as well. A horizontal distance of zero leaves the angle undefined, so that entry is blocked with its own message.
The maths is a single arctan on a right triangle, and the formula used is printed with the results. Anterior pelvic tilt cannot be read as an angle from a mirror or a photo: an angle needs both landmarks and both measurements, and a few millimetres of difference in where you press changes the result. For the same reason no normal range is included here (reviewed October 2026).
This page is not a medical assessment. It does not grade a degree of tilt or prescribe corrective exercise; it converts the two numbers you enter. Self-measurement carries real error, so comparing repeat measurements taken the same way is more useful than one reading. If your lower back or hip hurts, or a leg feels numb, see a clinician regardless of the angle.
Frequently Asked Questions
This page gives no threshold. The value shifts with where the landmarks are pressed and no authoritative self-measurement standard is published, so only your own numbers are converted.
No. An angle needs a height difference and a horizontal distance between two points. Looking at yourself does not produce one.
With a base of zero there is no right triangle, so the angle is undefined. Measure the actual front-to-back distance between the two points instead.