While it's not important which citizenship you have, it is very relevant to know your type of permit in Switzerland.
Unless you have a C permit (aka residence in the sense of the Swiss laws) or are married to another Swiss resident, you will be taxed at source as long as your income is below CHF 120.000 per year.
You can find more information on this tax at source here (it's in German but you can download a PDF in english).
You can find the current tax at source tariffs here.
If you are/become a full resident or fulfill one of the other mentioned criteria, you'll be no longer taxed at source but have to hand in a tax declaration and will be taxed ex-post.
Calculating your expected taxes can be a bit tedious since there are three tax levels to be considered (federal, cantonal, communal) and they all come with different and usually progressive rates.
I really like this tax calculator, the results should be accurate and it's available in English.