Volumetric weight calculator
Compute volumetric and billable weight for DHL (÷5000), FedEx (÷5000 or ÷6000), UPS, EMS and China Post (÷6000, ÷8000): compare actual against dimensional weight, scale by piece count, and edit the divisor table yourself.
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Parcel size and weight
Volumetric weight = length × width × height ÷ divisor, and carriers bill the greater of actual and volumetric weight. The divisors and rounding rules below are default reference values (as of 2026-10) — always confirm against your carrier tariff.
Divisors and rounding (editable)
A smaller divisor means a heavier dimensional weight. These are default reference values (as of 2026-10); edit them to match the contract you actually have.
| Carrier | Divisor (cm³/kg) | Rounding step | Minimum billable | Note |
|---|---|---|---|---|
| DHL Express | 0.5 kg | 0.5 kg | Divisor 5000, rounds up to 0.5 kg, minimum 0.5 kg (default reference, 2026-10) | |
| FedEx Express | 0.5 kg | 0.5 kg | Divisor 5000, some services use 6000; rounds up to 0.5 kg (default reference, 2026-10) | |
| UPS | 0.5 kg | 0.5 kg | Divisor 5000, some services 6000; rounds up to 0.5 kg (default reference, 2026-10) | |
| EMS (China Post international EMS) | 0.5 kg | 0.5 kg | Divisor 6000, rounds up to 0.5 kg (default reference, 2026-10) | |
| China Post international small packet / air parcel | 1 kg | 1 kg | Divisor 6000, some channels 8000; rounds up to 1 kg (default reference, 2026-10) |
Volumetric vs billable weight
| Carrier | Volumetric (per piece) | Actual (per piece) | Billable (per piece) | Billed on | Shipment billable |
|---|---|---|---|---|---|
| DHL Express · ÷5000 | 12 kg | 10 kg | 12 kg | Volumetric weight | 12 kg |
| FedEx Express · ÷5000 | 12 kg | 10 kg | 12 kg | Volumetric weight | 12 kg |
| UPS · ÷5000 | 12 kg | 10 kg | 12 kg | Volumetric weight | 12 kg |
| EMS (China Post international EMS) · ÷6000 | 10 kg | 10 kg | 10 kg | Actual weight | 10 kg |
| China Post international small packet / air parcel · ÷6000 | 10 kg | 10 kg | 10 kg | Actual weight | 10 kg |
10 kg12 kg16726.46What this tool does
- Check the dimensional weight before you ship: enter the box dimensions and actual weight to see how many kilos DHL, FedEx, UPS and EMS will each bill you for.
- Compare carriers: the same box can differ by several kilos between a ÷5000 and a ÷6000 divisor, so you know what switching channels really saves.
- Explain an unexpected invoice — an 8 kg parcel billed at 12 kg is bulky cargo billed on volumetric weight, and the tool marks that case explicitly.
- Multiple identical boxes: enter the piece count and the tool rounds each piece up first, then multiplies, matching how carriers bill a shipment.
Example
Input
50 cm × 40 cm × 30 cm, 10 kg actual weight per piece, 1 piece
Output
Volumetric weight ÷5000 = 12 kg, ÷6000 = 10 kg; DHL billable 12 kg (volumetric), EMS billable 10 kg (actual), shipment actual weight 10 kg
50 × 40 × 30 ÷ 5000 = 12 kg, which exceeds the 10 kg actual weight, so the DHL row bills on volumetric weight; with the ÷6000 divisor EMS gets exactly 10 kg and bills on actual weight.
Frequently asked questions
Do carriers bill actual or volumetric weight?
International express carriers bill whichever is greater. Light and bulky parcels pay for volume, small and dense parcels pay for mass. The tool computes both and marks which side wins for each carrier row.
Which divisor should I use — 5000 or 6000?
A smaller divisor produces a heavier dimensional weight and costs you more. DHL and most FedEx / UPS services use 5000, while some FedEx / UPS services plus EMS and China Post channels use 6000, occasionally 8000. The values shipped here are default reference values (as of 2026-10) — edit them to match your contract.
Why is the billable weight always a multiple of 0.5 kg?
Carriers round up to the next 0.5 kg (China Post small packet rounds to 1 kg) and apply a minimum billable weight, usually 0.5 kg. The tool rounds each piece up first and only then multiplies by the piece count, which is how carriers bill a multi-piece shipment.
What unit are the dimensions in?
Centimetres, decimals allowed (for example 30.5). Internally everything is converted to whole millimetres so the arithmetic stays exact. Any side longer than 300 cm is rejected as out of range.
Is the resulting cost accurate?
This tool computes weight only, not price. Once the weight is right you still have to apply the carrier rate, fuel surcharge, remote-area surcharge and peak-season fees, and first-kilo / additional-kilo structures differ per channel.
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