The calculated distance (air line) between Zürich (Kreis 6) / Unterstrass and Zug is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Zug is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 6) / Unterstrass and Zug has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles