Conversions and Guides – Water Chemistry CaCO3 Equivalents

Multiply the mg/l of the substances listed below by the corresponding factors to obtain mg/l as CaCO3. For example, 70 mg/l of Mg + + would be (70) (4 10) = 287 mg/l as CaCO3. Also see our helpful online Total Hardness Calculator.

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substance factor substance factor
Al+ + + 5.56 K+ 1.28
Al2(SO4)3(a) 0.88 KCl 0.67
Al2(SO4)3(a) 0.88 KCl 0.67
AlCl3 1.13 K2CO3 0.72
Al(OH)3 1.92 Mg+ + 4.10
Ba+ + 0.73 MgCl2 1.05
Ba(OH)2 0.59 MgCO3 1.19
BaSO4 0.43 Mg(HCO3)2 0.68
Ca+ + 2.50 MgO 2.48
CaCl2 0.90 Mg(OH)2 1.71
CaCO3 1.00 Mg(NO3)2 0.67
Ca(HCO3)2 0.62 MgSO4 0.83
CaO 1.79 Mn+ + 1.82
Ca(OH)2 1.35 Na+ 2.18
CaSO4(a) 0.74 NaCl 0.85
Cl– 1.41 Na2CO3 0.94
CO2 2.27 NaHCO3 0.60
CO–3 1.67 NaNO3 0.59
Cu+ + 1.57 NaOH 1.25
Cu+ + + 2.36 Na2SO4(a) 0.70
CuSO4 0.63 NH3 2.94
F- 2.66 NH4 2.78
Fe+ + 1.79 NH4OH 1.43
Fe+ + + 2.69 (NH4)2SO4 0.76
Fe(OH)3 1.41 NO-3 0.81
FeSO4(a) 0.66 OH 2.94
Fe2(SO4)3 0.75 PO—4 1.58
FeCl3 0.93 SO–4 1.04
H+ 50.0 Zn+ + 1.54
HCO-3 0.82    

(a)anydrous

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