HomeAppsProductivityDuct CalculatorApps like Duct Calculator Here are some great alternatives to Duct Calculator by Number Engineer : HVAC Duct Sizer ★5.0 Duct Calc Elite - Ductulator ★3.5 Digiduct ★5.0 Ductulator Pro ★4.1 Duct Sizer ★3.4 Pipe Diameter Calculator ★4.0 CookTools ★4.0 Greenheck Toolbox ★4.0 Air Conditioner - Calculator ★3.6 Flange Bolt Size & Torque ★4.6 Miter Bend Layout ★5.0 Diameter Calculator ★4.4 Concrete Calculator ★4.3 Ariel Quick Size ★5.0 Simple Offset Pro + ★3.8 Circle Calculator ★3.5