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.

True dip

True dip of the plane in degrees.

theta

Angle between the vertical section and the dip direction in degrees.

Apparent dip seen on a vertical section: tan(delta_apparent) = tan(delta_true) * cos(theta), where theta is the angle between the section and the dip direction. 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]

Apparent dip

Apparent dip on the section in degrees.

• Apparent dip, thickness, fault, and fold geometry depend on coordinate convention, orientation measurements, map or section geometry, exposure, projection, and assumptions about planar or cylindrical structures. Ambiguous contacts require field or 3D validation.
• 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.

• True Thickness From Apparent Calculator

  Convert an apparent thickness measured on a vertical traverse to true bed thickness: t_true = t_apparent * cos(theta), where theta is the angle between the traverse and the dip direction.

• Stratigraphic Thickness True Vs Apparent Calculator

  For a bed cropped out over width w perpendicular to strike on horizontal ground: true thickness t = w sin(delta) and vertical (apparent) thickness t_v = w tan(delta), with dip delta in degrees.

• Isochore Thickness Calculator

  Vertical (isochore) thickness from true stratigraphic thickness and dip: T = t / cos(dip).