ParcelMathRules verified

Billable weight calculator

Know when you’re
paying to ship air.

Compare actual and dimensional weight across DHL, FedEx, and UPS. See the exact rule behind the number before you quote a shipment.

Runs in your browserNo accountOfficial-rule sources

Calculate

Your shipment, piece by piece.

Carrier rule
Package 1

The method

One formula. Two weights. No black box.

Dimensional weight converts the space a parcel occupies into a weight. Each package is evaluated separately, then the billable weights are added together.

  1. 01

    Measure the outer box

    Use the longest points, including bulges. Carrier-specific dimension rounding is applied where the official rule states it.

  2. 02

    Calculate dimensional weight

    Multiply length, width, and height, then divide by the selected carrier factor.

  3. 03

    Keep the greater weight

    Compare dimensional and actual weight for each package. The greater value becomes the estimated billable weight.

Sources

Rules you can inspect.

DHL Express5,000 metric divisorOfficial weight & dimensions guide ↗
verified

Confirm service, contract, route, and final rounding with DHL before quoting.

FedEx US139 imperial divisor2026 Service Guide · pp. 135–136 ↗
verified

US guide estimate only; contract rates, service minimums, and surcharges are excluded.

UPS US139 daily / 166 retail2026 Rate Guide · p. 20 ↗
verified

US Daily and Retail estimates only; negotiated rates and service exceptions are excluded.

Rules last verified July 24, 2026. This calculator does not provide carrier quotes.