The calculated distance (air line) between Zürich (Kreis 3) / Friesenberg and Zug is approximately 13 miles respectively 21 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) / Friesenberg and Zug has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles