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.

Off-bottom load

Hook load with the string off bottom in kilonewtons.

On-bottom load

Hook load with the string on bottom in kilonewtons.

Determine weight on bit from the difference between off-bottom and on-bottom hook loads. 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]

WOB

Weight carried by the bit in kilonewtons.

• 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.

• Apparent Dip Calculator

  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.

• Magnetic Anomaly Total Field Calculator

  Total-field magnetic anomaly in nanotesla: the difference between the observed total-field magnitude and the regional (main-field) magnitude at the same location.

• Mud Weight Required Calculator

  Determine the mud density needed to balance a known pore pressure at depth, including an optional trip margin.