Petroleum Engineering Calculators
Field engineering calculations with cited correlations and explicit validity ranges: gas Z-factor, oil viscosity, pressure drop, hydrostatic pressure, mud weight, reservoir volumetrics.
API Gravity Calculator
Converts between API gravity, specific gravity and density at 60 °F using the API 2540 definition, with the formula returned.
Pressure Converter
Converts among psi, bar, kPa, MPa, atm, kg/cm², inH₂O and mmHg, and between gauge and absolute with a stated atmospheric reference.
Temperature Converter
Converts among Celsius, Fahrenheit, Kelvin and Rankine with absolute-zero bounds enforced.
Gas Z-Factor
Gas compressibility factor by the Dranchuk–Abou-Kassem correlation with Sutton pseudo-critical properties and optional sour-gas correction, reporting convergence and whether inputs are inside the correlation's validated range.
Oil Viscosity Correlation
Dead, saturated and undersaturated oil viscosity by Beggs–Robinson with Vasquez–Beggs above bubble point, with valid ranges and extrapolation warnings.
Pipe Pressure Drop
Single-phase pressure drop by Darcy–Weisbach with a Colebrook–White friction factor, returning Reynolds number, flow regime and the elevation component.
Hydrostatic Pressure
Hydrostatic pressure from fluid density and true vertical depth in field or SI units, with the gradient returned.
Mud Weight & EMW
Equivalent mud weight and equivalent circulating density from pressure and depth, with kick-tolerance context.
Reservoir Volumetrics
Volumetric STOIIP or GIIP from area, thickness, porosity, saturation and formation volume factor, with optional P10/P50/P90 from supplied input uncertainty.
CO₂ Emissions Estimate
Estimates CO₂-equivalent emissions from fuel or flare volumes using published emission factors, citing the factor source and its uncertainty.