HomeAppsProductivityDuct CalculatorApps like Duct Calculator Here are some great alternatives to Duct Calculator by Number Engineer : Duct Calc Elite - Ductulator ★3.6 Digiduct ★5.0 Ductulator Pro ★4.1 Pipe Diameter Calculator ★4.0 CookTools ★4.0 Greenheck Toolbox ★4.0 Air Conditioner - Calculator ★3.6 Miter Bend Layout ★5.0 Diameter Calculator ★4.4 Concrete Calculator ★4.3 Ariel Quick Size ★5.0 Flange Bolt Size & Torque ★4.6 Circle Calculator ★3.5 Timberlog - Timber calculator ★4.2 Calcular BTU ★3.3 WARDFLEX Jobsite Assistant ★4.0