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Conversion & Calculators

Online Converters

With these calculators you can calculate Anglo-American units to the standards units (SI-units). This may be useful, because most American and British use American or British units and European use the standard metric units. With the conversion calculators you can convert the units that are most commonly used.
Length Unit
Surface / Area
Mass Weight

Hardness Calculator

Many industrial and domestic water users are concerned about the hardness of their water. Hard water requires more soap and synthetic detergents for home laundry and washing, and contributes to scaling in boilers and industrial equipment. Hardness is caused by compounds of calcium and magnesium, and by a variety of other metals. Water is an excellent solvent and readily dissolves minerals it comes in contact with. As water moves through soil and rock, it dissolves very small amounts of minerals and holds them in solution. Calcium and magnesium dissolved in water are the two most common minerals that make water "hard".
Total Calcium
Total Magnesium
Hardness, Calcium as CaCO3
Hardness, Magnesium as CaCO3
Total Hardness as CaCO3
Hardness, Total as Ca (Calc)

Ionic Balance Calculator

The ion balance is used to check analytical results. Total anions must be in balance with total cations. Therefore the sum of the concentrations of anions should equal the total concentration of cations and the ratio of total anions to total cations should be 1. The concentrations in this case must be in terms of ion equivalents. The graphical representation of ion equivalent concentrations helps you to visualise the characteristics of the water in terms of its principal dissolved salts.
Sum of Cations
Sum of Anions
Ionic Balance
Not Known

Trade Effluent [Mogden Formula]

Companies in the UK have to pay for their waste water or 'industrial effluent' to be treated by the local water authority; this is done in accordance with the Mogden Formula. A company only has the ability to control three factors in this formula; Volume, Chemical Oxygen Demand (COD) and Suspended Solids (SS). However, the Water Services Regulation Authority (OFWAT) regulates the costs associated with the treatment of wastewater and annually publishes the standard charges for each water authority. For a more detailed explanation, please click here.
Charge per unit of effluent = R + V + Bv + Vm + M + [B x (Ot/Os)] + [S x (St/Ss)]
Please note that this mogden formula calculator is for indicative purposes only.
Choose Appropriate component
Select your water authority/supplier
What is the annual volume of your effluent? (m3)
What is the average chemical oxygen demand of your effluent? (mg/l)
What is the average suspended solids of the effluent? (mg/l)
Your annual charge would be £0.00  

Langelier Saturation Index

The Langelier Index is an approximate measure of the saturation degree of calcium carbonate (CaCO3) in water. It is calculated using the Hydrogen Ion (pH) , Alkalinity (CaCO3), Calcium concentration, Total Dissolved Solids, and water temperature of a tap water sample. The Langelier Index (LI) is calculated as follows:
LI = pH (pH Value) - pHs (Saturation pH)
The Langelier Index is one of several tools used by water operators for stabilising water to control both internal corrosion and the deposition of scale. Water supply operators can optimise their water supply systems and identify leakage potentials with the Langelier Index.
pH value of the water
Conductivity of the water [TDS value]
Calcium content (Ca)
Bicarbonate content (HCO3-)
Water Temperature
The calculated pHs value is 0.00, resulting in a LSI of 0.0000.  
Indication based on Langelier Index
Indication based on Langelier by Carrier

Ryznar Stability Index

The Ryznar stability index (RSI) attempts to correlate an empirical database of scale thickness observed in municipal water systems to the water chemistry. Like the Langelier Saturation Index (LSI), the RSI has its basis in the concept of saturation level. Ryznar attempted to quantify the relationship between calcium carbonate saturation state and scale formation. The Ryznar index takes the form:
RSI = 2 * pHs (Saturation pH) - pH (pH Value)
pH value of the water
Conductivity of the water [TDS value]
Calcium content (Ca)
Bicarbonate content (HCO3-)
Water Temperature
The calculated pHs value is 0.00, resulting in a RSI of 0.00.  
Indication based on Ryznar Stability Index
Indication based on Ryznar Stability by Carrier