Free Oilfield Unit Converter

This free oilfield unit converter is designed specifically for petroleum engineers, drilling engineers, reservoir engineers, and production engineers who need fast, reliable unit conversions on the job. Whether you are converting wellbore pressures from psi to bar, production volumes from barrels to cubic meters, or mud weight from ppg to specific gravity, this tool handles it instantly with no sign-up and no ads.

The converter supports 12 categories of units commonly used in oil and gas operations: pressure (psi, bar, kPa, MPa, atm, kg/cm²), volume (bbl, m³, gallons, liters, ft³, Mcf, MMcf), flow rate (bbl/d, m³/d, gal/min, L/s, Mcf/d, MMcf/d), length (ft, m, in, cm, miles, km), density and mud weight (ppg, SG, kg/m³, lb/ft³, psi/ft, kPa/m), API gravity (API to SG with the standard nonlinear formula SG = 141.5 / (API + 131.5)), temperature (°F, °C, K, °R), permeability (millidarcies, darcies, m²), viscosity (centipoise, Pa·s, lb/(ft·s)), energy (BOE, Mcf gas, MMBtu, GJ, kWh), force and torque (lbf, N, kN, ft-lbf, N·m), and area (acres, hectares, sq ft, sq m, sq miles, sq km).

All calculations run entirely in your browser. No data is sent to any server. Conversion factors are sourced from the Society of Petroleum Engineers (SPE) standards and NIST reference tables. Results update in real time as you type, so there is no need to click a button or wait for a response.

Built by Groundwork Analytics, a petroleum engineering consulting firm led by Dr. Mehrdad Shirangi (Stanford PhD) specializing in reservoir simulation, production optimization, and AI/ML applications for upstream oil and gas.