HomeAppsProductivityDuct CalculatorApps like Duct Calculator Here are some great alternatives to Duct Calculator by Number Engineer : HVAC Duct Sizer ★4.5 Duct Calc Elite - Ductulator ★3.6 Ductulator Pro ★4.0 DUCT Ductulator ★4.6 Pipe Diameter Calculator ★4.0 CookTools ★4.0 Pipe Diameter Calculator Lite ★5.0 Greenheck Toolbox ★4.0 Air Conditioner - Calculator ★3.6 Orifice Gas Flow ★4.6 Concrete Calculator ★3.5 Diameter Calculator ★4.3 Miter Bend Layout ★5.0 Concrete Calculator ★4.3 Ariel Quick Size ★5.0 Simple Offset Pro + ★3.8