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 thickness (m)

True stratigraphic thickness measured perpendicular to bedding, in metres.

Bed dip

Bed dip in degrees.

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

Isochore thickness (m)

Vertical (isochore) thickness in metres.

• Stratal terminations and systems tracts are interpretations sensitive to seismic resolution, datum, compaction, subsidence, sediment supply, chronology, and depositional model. A geometric angle or thickness alone does not identify sequence boundaries.
• 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.

• Isopach Thickness Calculator

  True stratigraphic thickness (isopach) measured perpendicular to bedding from a vertical thickness: t = T * cos(dip).

• 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.

• 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.