UTCal

Your UT Bible, built for the field. Skip distance, D1.1 acceptance, beam path diagrams, encoder calibration, pipe data, and code criteria — offline, right in your pocket.

Built by a working NDT tech for working NDT techs. No account. No internet. No subscription. Runs entirely on-device.

CALCULATOR
• Skip distance, half skip, and full skip for any angle and thickness
• Beam spread — near-field distance, half-angle, and full spread
• AWS D1.1 indication rating
• Fracture mechanics — critical flaw size & ASME VIII Div 2/3 evaluation
• Transfer correction (dB)
• Encoder step resolution converter — steps/mm ↔ steps/in, with target-distance conversion for OmniScan calibration
• Imperial and metric — switch units anytime

BEAM PATH DIAGRAM
• Interactive cross-section of your beam path through the material
• Drag the probe to see coverage and position change in real time
• Rotate to landscape for a fullscreen diagram

WELD OVERLAY
• Overlay Single V or Double V weld joint profiles on the beam path diagram
• 5 standard weld presets, or enter custom bevel angle, root opening, and root face
• Index offset — see where your probe index point sits relative to the weld centerline

PIPE DATA
• NPS 1/8" through 48" per ASME B36.10M
• OD, ID, wall thickness, and scan length for every standard schedule
• Stainless steel schedules where wall thickness differs from carbon steel (dual ASME standard support)
• Apple Watch companion — quick pipe lookups on your wrist

CODE ACCEPT/REJECT CRITERIA
• ASME Section V, Article 4
• ASME B31.3 — Process Piping
• AWS D1.1 — Structural Welding
• API 1104 — Pipeline Welding
• Inches and millimeters, side by side

SETUPS & HISTORY
• Build and save complete job setups — material, angle, frequency, weld geometry, and notes
• Save calculation results with names and notes, then recall them in one tap for your records
• Custom presets for your most-used configurations

FREE & PRO
• Free to download — skip distance, Snell's law, and a hands-on trial of every Pro tool
• The full pipe chart is free for your first 10 lookups, then part of Pro
• UTCal Pro unlocks unlimited use of everything: the full pipe chart, saved calculation history, custom presets & weld builder, encoder calculator, fracture mechanics, beam path diagrams, weld overlay, the full code library, and the Apple Watch app
• One-time purchase — no subscription, ever

WHY UTCAL
• Built by a UT tech who got tired of doing skip math on a paper napkin
• Works on the roof, in the ditch, in the shop — no signal required
• Updated for the latest ASME, AWS, and API editions

Questions or feature requests: support.utcal@carboncode.app