The calculated distance (air line) between Taka-Töölö and Nurmijärvi is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Nurmijärvi is certainly longer, as only the direct route (as the crow flies) between Taka-Töölö and Nurmijärvi has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles