The calculated distance (air line) between Gränichen and Zürich (Kreis 12) is approximately 22 miles respectively 36 kilometers.
By car or train, the actual journey to Zürich (Kreis 12) is certainly longer, as only the direct route (as the crow flies) between Gränichen and Zürich (Kreis 12) has been calculated here.
Air line (approximately)
36 kilometers
19 nautical miles