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.

Specific gravity

Oil specific gravity relative to water at 60 °F.

Convert the specific gravity of crude oil at 60 degrees Fahrenheit to API gravity. 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]

API gravity

API gravity in degrees API.

• Geological models are scale-, site-, method-, and calibration-dependent. Heterogeneity, anisotropy, sampling, diagenesis, pressure-temperature history, instrument response, boundary conditions, and empirical-correlation range can dominate the result.
• 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.

• Oil Density Calculator

  Convert API gravity to crude oil specific gravity and density in kg/m3.

• Cement Slurry Density Calculator

  Compute neat cement slurry density and yield per tonne of dry cement from the water/cement mass ratio and cement specific gravity.

• Dip Direction To Strike Calculator

  Convert a dip direction azimuth to the perpendicular strike azimuth (right-hand rule subtracts 90 degrees).