Dimensional Weight Calculator

Calculate the dimensional (volumetric) weight of your parcel for DHL, FedEx, UPS, and other couriers to find out which weight you'll actually be charged.

What Is Dimensional Weight?

Dimensional weight (or volumetric weight) is a pricing technique that accounts for the space a package takes up on a delivery vehicle. Couriers charge based on whichever is greater: the actual weight or the dimensional weight. This prevents sellers from sending light items in oversized boxes.

The formula is: (Length × Width × Height in cm) ÷ Divisor = Dimensional Weight

Divisor by Courier

Different couriers use different divisors. A lower divisor means higher dimensional weight charges. DHL, FedEx, UPS, and TNT use 5000. Evri/Hermes uses 4000, making dimensional charges higher with them.

Which UK Couriers Use Dimensional Weight?

Yes — Dimensional Weight Applied

  • DHL: Divisor 5000
  • FedEx: Divisor 5000
  • UPS: Divisor 5000
  • TNT: Divisor 5000
  • Evri/Hermes: Divisor 4000 (for most services, not always on budget services)

No — Dimensional Weight Not Applied

  • Royal Mail: Uses fixed format tiers (Letter, Large Letter, Small Parcel, Medium Parcel)
  • Yodel: Uses weight bands, not dimensional weight
  • Parcelforce: Uses weight and size restrictions, not dimensional pricing

How to Reduce Dimensional Weight Charges

Packing Tips

  • Use smaller boxes and envelopes where possible
  • Pack items tightly to minimize wasted space
  • Consider lightweight packaging materials (bubble wrap instead of packing paper)
  • Avoid oversized boxes that exceed your product dimensions by much
  • Use box size that matches your product as closely as possible

Frequently Asked Questions

Why is my shipping charge higher than my actual weight?

Your package's dimensional weight exceeds its actual weight. Couriers charge for whichever is larger to prevent customers from sending light items in huge boxes, which wastes vehicle space.

Does Royal Mail use dimensional weight?

No. Royal Mail uses fixed format categories (Letter, Large Letter, Small Parcel, Medium Parcel) instead of dimensional weight. They don't charge based on how much space your item takes up.

How do I know which courier uses which divisor?

Most major international couriers (DHL, FedEx, UPS, TNT) use 5000. Evri/Hermes uses 4000. Always check your courier's website or shipping software for the exact rate card.

Can I argue if I'm charged dimensional weight?

Generally no — dimensional weight is a standard industry practice used by all major couriers for large, light items. It's disclosed in their terms. The best strategy is to pack more efficiently.

Is this calculator 100% accurate?

This calculator uses the standard dimensional weight formula. However, couriers may apply rounding rules, minimum charges, or special handling fees that won't show here. Always verify with your courier's rate card before shipping high-value items.