The calculated distance (air line) between Zürich (Kreis 3) / Sihlfeld and Zug is approximately 14 miles respectively 22 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 3) / Sihlfeld and Zug has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles