The calculated distance (air line) between Mattenbach (Kreis 7) and Schaffhausen is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Schaffhausen is certainly longer, as only the direct route (as the crow flies) between Mattenbach (Kreis 7) and Schaffhausen has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles