Piercing Angle & Depth Guide: User Guide
How entry angle and tissue thickness decide the length and direction of a piercing channel, and how to use each part of the tool.
A free reference for trained body piercers and informed clients. It shows how the entry angle and the tissue thickness decide the length and direction of a piercing channel, and why a tilted channel makes jewelry sit unevenly.
Published by Poli International. Live tool: https://poliinternational.com/piercing-angle-guide/
This guide is a reference. It does not replace hands-on training, and it does not decide whether a piercing is suitable for a particular person.
Choosing a placement
Pick a placement from the buttons (ear, facial, body and genital groups), search for it by name, or click a point on the 3D anatomy model. Recently viewed placements appear as quick links.
Angle visualizer
A cross-section of the tissue with the bar and both discs drawn on it.
- Drag either disc, use the slider, or use the preset buttons (-15°, -5°, 0°, +5°, +15°). "Animate Shift" sweeps the angle.
- When the channel is straight, both discs sit flat on the skin.
- When it is tilted, a triangle marks the disc edge that presses into the skin and an open circle marks the edge that lifts off. The channel is drawn dashed.
- The readout shows the channel length and how much longer it is than the tissue.
- Three cards summarise the result: angular deviation, disc contact and channel alignment. They describe the geometry only; for migration and rejection risk factors, the tool links to the Piercing Migration Risk tool.
- Download the diagram as SVG or PNG.
Tissue thickness and channel length
Enter the measured tissue thickness with the slider or the 0.1 mm fine-tune stepper, or pick the thin, typical or thick value for the placement. The channel length is:
channel length = tissue thickness / sin(angle)
At 90° the channel equals the tissue thickness. Any tilt makes it longer.
Starting jewelry is longer than the channel to leave room for swelling and is shortened once swelling settles. The tool does not calculate jewelry lengths; it links to the Jewelry Size Visualizer for that.
Placement reference
For each placement:
- Baseline specs: target angle, typical tissue thickness, tissue type and typical healing time.
- Why this angle: what the angle has to clear, and what goes wrong at a bad angle.
- Clinical angle error modes: the same cross-section drawn correct, too shallow, too steep and asymmetric.
- Typical starting jewelry: gauge, typical length and typical downsize timing, with a link to the Jewelry Size Visualizer.
- Positioning, technique, common pitfalls and when to refuse.
- Healing and aftercare: links to the Aftercare Schedule Generator and the Healing Tracker. This tool does not set a healing schedule.
Paired piercing symmetry
For pairs (lobes, nostrils, eyebrows, snake bites, nipples, ear flats):
- Landmark guide: a diagram of the reference lines to measure from, with step-by-step checks.
- Simulator: set the left and right angles and the height offset to see whether the pair matches.
Compare mode
Show two placements side by side: angles, tissue ranges, channel depth, typical starting jewelry, healing time, clearance, hazards and refusal criteria. The comparison can be printed.
Studio house standard
Record your studio's preferred starting gauge, jewelry style and marking notes for a placement. It is saved in this browser only and shown on the printed sheet.
Notes, printing and export
- Professional notes: saved for the current browser session, per placement.
- Print or Save as PDF: a one-page placement sheet for the piercing room, through the browser's print dialog.
- Download JSON / Copy summary: the placement reference and your notes.
Settings
- Units: millimetres or inches.
- Languages: English, French, German, Italian, Spanish, Portuguese, Dutch and Thai.
- Light and dark themes.
- Embed: copy an iframe snippet from the Embed button.
Privacy
Everything runs in your browser. Nothing you enter is sent anywhere; preferences stay in local storage and notes in session storage.
Use the tool
Open the Piercing Angle & Depth Guide: User Guide. Everything runs in your browser; nothing you enter is sent anywhere.