FedEx Volumetric Weight Calculator: Shipping Cost Calculation, Packaging Optimization, Budget & Quote Planning, Imperial & Metric Support. Budget and Quote Planning: Businesses use consistent volumetric data to build reliable shipping budgets, generate accurate customer quotes, and forecast costs across high-volume order periods without relying on guesswork. Imperial (Inches/Pounds) and Metric (Centimeters/Kilograms) Calculation: The calculator supports both measurement systems, letting U.S. sellers work in inches and pounds while accommodating international shipments measured in centimeters and kilograms — all using the correct corresponding divisor for each unit system. Anyone shipping packages in the USA can use the DimMath calculator for free — including individual online sellers, small business owners, e-commerce store operators, freight coordinators, warehouse and fulfillment teams, and logistics managers at larger companies.