Use this geological calculation for a transparent first-pass interpretation of measured rock, soil, fluid, well, stratigraphic, isotopic, geophysical, or seismic data under an explicitly selected model.

Yield strength

Casing minimum yield strength in megapascals.

OD

Outside diameter in millimetres.

Wall

Nominal wall thickness in millimetres.

Compute the API-style internal burst resistance of casing using the Barlow formula with a 87.5 percent wall tolerance factor. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

D/t

Ratio of outside diameter to wall thickness.

Burst pressure

Internal burst pressure in megapascals.

• Drilling and casing calculations depend on well geometry, fluid rheology and density, temperature, pressure, surge and swab, kick scenario, cement placement, wear, connection strength, transient hydraulics, and operator standards.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Compare independent measurements and models, retain units and analytical metadata, propagate uncertainty, and validate interpretations against logs, cores, maps, laboratory data, or field observations.

• Casing Collapse Pressure Calculator

  Compute the thin-wall external collapse resistance of casing from yield strength, outside diameter and wall thickness.

• Casing Biaxial Stress Calculator

  Derate the nominal collapse pressure of casing for combined axial tension using the API biaxial correction.

• Active Earth Pressure Calculator

  Rankine active lateral earth pressure sigma_a = Ka * gamma * z at a given depth behind a vertical wall with a level backfill.