UT Skip Distance Calculator

Calculate beam skip distances for ultrasonic testing per AWS D1.1/D1.1M:2025. Enter your material thickness and select a search unit angle to determine full skip, half skip, and Leg 1 sound path for probe placement.

Inputs

Material Thickness — nominal thickness of the material being tested

Search Unit Angle — select the transducer refracted angle

Results

Enter thickness and select an angle to calculate

Full Skip Distance (S) Beam travels down, reflects off back wall, and returns to top surface

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Half Skip (S ÷ 2) Probe to first reflection point — used for probe placement

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Sound Path — Leg 1 Actual beam travel length to back wall

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Important: The sound path (Leg 1) is the actual beam travel distance — this is what you reference against the UT scanning level table, not material thickness. Always verify results with a qualified UT inspector.

Need the Full UT Calculator?

The complete AWS D1.1 UT acceptance/rejection calculator — including Table 8.2 and Table 8.3 classification, all footnote logic, and printable inspection reports — is available for registered users.

Table 8.2 — Static & Cyclic Compression

Table 8.3 — Cyclic Tension

Class A / B / C / D Classification

Accept / Reject with Code Reference

All Footnote Logic (Notes 1–5)

Printable Inspection Reports

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