Units and dimensions
Unit converter
Convert compatible length, pressure, volume, flow, mass and temperature units.
Open converter →Open engineering workbench
A useful calculation.
A clearer next step.
Free tools for first-pass technical checks. Each shows its units, equation and assumptions. Calculations run in your browser and can be exported.
These simplified screening calculations require independent professional verification before design, operation, chemical handling or safety decisions.
Chemical dilution
Estimate stock and diluent volumes for an ideal dilution.
Open calculator →Chemical dosing
Convert a specified process dose into mass and stock solution flow.
Open calculator →Pump power
Estimate shaft power from flow, head, density and pump efficiency.
Open calculator →Pump head
Convert a pressure rise into equivalent fluid head.
Open calculator →Pipe velocity
Find average flow velocity in a full circular pipe.
Open calculator →Pipe pressure drop
Estimate major friction loss using a supplied Darcy friction factor.
Open calculator →Tank volume
Calculate the working volume of an upright circular cylinder.
Open calculator →RO recovery
Calculate the water recovery ratio from feed and permeate flows.
Open calculator →Chlorine mass balance
Convert an independently specified active chlorine dose to mass flow.
Open calculator →Hydraulic retention time
Calculate nominal residence time from working volume and flow.
Open calculator →Wastewater loading
Convert concentration and daily flow into mass and volumetric loads.
Open calculator →