Calculating Equity vs a range?

Not that it is something you actually do at the table, but how do you think you would do it?

A poker equity calculator like Equilab (free) will do that, but it is a showdown equity, meaning it provides your winning chance assuming the hand is checked down or a last bet is made on the river. Therefore, for an early street bet/call, it does not include folding probability, and folds happen frequently with future action.

It may be possible to adjust for future action so you can consider the showdown equity calculation as a first cut math look at win probability.