Home / Tools
ONB Engineering · Free engineering tools
Process engineering calculators
Quick, free calculators for everyday process engineering checks. No sign-up, and everything runs in your browser.
Ideal gas law
Solve PV = nRT for pressure, volume, moles, or temperature. Includes density and mass.
Open calculator →Actual ↔ standard gas flow
Convert between actual flow (ACFM, Am³/h) and standard flow (SCFM, Nm³/h).
Open calculator →Gas mixture molar mass
Average molecular weight of a gas mixture from mole % or mass %.
Open calculator →Tank volume
Total and filled volume for vertical, horizontal, rectangular, and spherical tanks.
Open calculator →Pipe flow velocity
Fluid velocity from flow rate and pipe inside diameter, with Schedule 40 sizes.
Open calculator →Reynolds number
Check whether pipe flow is laminar, transitional, or turbulent.
Open calculator →Unit converter
Length, mass, volume, pressure, temperature, flow, density, viscosity, energy, and power.
Open converter →No tools match that search.
Have a project in mind?
Get in touch with ONB Engineering to talk it through.
Schedule a call Email ONB