Royal Mail dimensional weight

Check the chargeable weight

Open the dimensional-weight calculator with this preset. Planning divisors only; carrier service, origin, destination, rounding, and account rules control billing. Source: Royal Mail parcel size and weight guidance.

Worked dimensional-weight example

A 30 × 25 × 20 cm parcel has a planning dimensional weight of 3 kg using the 5000 cm³/kg divisor. Compare that figure with the scale weight, then apply the carrier's rounding and billable-service rules.

Before using the quote

• Confirm the exact service and destination zone.
• Measure the packed outside dimensions, including bulges.
• Check whether the account uses a different divisor or rounding rule.