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Mass Ratio

As water engineers we know how challenging it can be working on projects using different units - constantly changing between imperial to metric or metric to imperial.

Our water unit converter tool was developed to save you time by allowing you to quickly create a wide range of water and wastewater related conversions specific to your treatment project needs. By creating a hub for water and wastewater unit conversion you can increase the efficiency of your engineering work – water & wastewater projects, treatment designs, unit conversions, and water engineering calculations.
Wastewater Engineer


The primary units used throughout the water industry are flux, length, concentration, flow, temperature, mass, mass flux, and mass ratio which are all included in this tool.

Mass ratio calculations are critical for wastewater operators to ensure that their bacteria population is receiving the proper care. Many plants, on the other hand, suffer with a low mass ratio. A low mass ratio indicates that there are too many bacteria in your wastewater system in comparison to the biochemical oxygen demand (BOD). This results in a lack of beneficial floc-forming bacteria, as well as problems including bulking and excessive effluent Total Suspended Solids (TSS). To avoid these problems from happening, it is imperative that mass ratio calculations are as accurate as possible to keep the mass ratio numbers where they need to be. Mass Ratio units include grams per kilogram (g/kg), Milligram per kilogram (mg/kg), Kilogram per ton (kg/t), pounds per US ton (lbs/USton) and pounds per UK ton (lbs/UKton).

Due to the large number of formulae required to correctly translate equations between the imperial and metric systems, engineers in the water sector, in particular, will benefit from this translation tool. It can be difficult to ensure that data such as influent flows, membrane fluxes, hydraulic loading rates of specific civil structures (primary and secondary clarifiers), and process equipment (screens, retention sieves for MBBR, membrane for MBR, and so on) are exactly where they should be. With our conversion tool, the agony of converting units into actionable tasks in order to make treatment process adjustments more efficient has ended!

The Transcend tools can also assist you in configuring designs to accelerate the amount of time spent on drafting proposals. Make your next project a breeze with our free tools created by wastewater engineers for engineers like you!