The calculated distance (air line) between Heist-op-den-Berg and Charleroi is approximately 48 miles respectively 76 kilometers.
By car or train, the actual journey to Charleroi is certainly longer, as only the direct route (as the crow flies) between Heist-op-den-Berg and Charleroi has been calculated here.
Air line (approximately)
76 kilometers
41 nautical miles