https://www.vetsurgeon.org/f/clinical-questions/25125/online-calculators---acid-base---here-s-one Hi I always found manual calculations difficult, but we found this online (a nurse I am working with who is taking the Vets Nurse EEC exam) http://www.manuelsweb.com/abg.htm It works out acidosis / alkalosis from pH, CO2, HCO3 There are othersen-USTelligent Community 10