How do I calculate California sales tax?

The California state sales tax rate is 7.25%. This rate is made up of a base rate of 6%, plus California adds a mandatory local rate of 1.25% that goes directly to city and county tax officials. Depending on local sales tax jurisdictions, the total tax rate can be as high as 10.25%.
Read More: https://nerdcounter.com/california-tax-calculator/