How many ons in one cup?

This question can't be answered directly because "ons" is not a standard unit of measurement.

* If you meant "ounces," then the answer depends on what kind of ounces you're asking about:

* Fluid ounces (fl oz): There are 8 fluid ounces in one cup.

* Weight ounces (oz): This depends on the weight of the substance in the cup. For example, a cup of water weighs about 8 ounces, while a cup of sugar weighs about 7 ounces.

* If you meant a different unit, please specify and I'll try to help.