Parcel Dimensional Weight Comparison Calculator

Method, formula and assumptions

Dimensional mass = measured rectangular volume / entered divisor. Round dimensional and measured mass upward separately to the entered billing increment, then take their maximum.

Input definitions and supported units

• Measured parcel length (cm): Measured or assumed numerical value, from 0.01 to 1000; must be positive.
• Measured parcel width (cm): Measured or assumed numerical value, from 0.01 to 1000; must be positive.
• Measured parcel height (cm): Measured or assumed numerical value, from 0.01 to 1000; must be positive.
• Entered dimensional divisor (cm3/kg): Measured or assumed numerical value, from 1 to 100000; must be positive.
• Measured parcel mass (kg): Measured or assumed numerical value, from 0 to 10000; zero is supported where the stated method permits it.
• Billing mass increment (kg): Measured or assumed numerical value, from 0.001 to 100; must be positive.

Worked example with answer

40 x 30 x 20 cm is 24,000 cm3. An entered 5,000 cm3/kg divisor gives 4.8 kg; a 0.5 kg billing step rounds it to 5 kg, above a measured 3 kg.

How to use the results

The divisor and step are user-supplied assumptions. The result is a comparison mass, not a carrier price or eligibility decision.

Results retain full precision internally and display up to four decimal places. Very small nonzero results use scientific notation rather than appearing as zero. Check the labels before comparing values across units.

Limitations and references

Carrier-specific dimension rounding, minimums, service regions and surcharges can change billed weight. The example does not claim a current FedEx, UPS or postal tariff.

FedEx: what dimensional weight means. Concept page checked October 11, 2026; no dated divisor or tariff is imported.

Related planning tools

• Carton Orthogonal Case-Pack Calculator
• Carton Void Fill Material Calculator

Browse all Logistics & Fulfillment calculators