Calculate dimensional (DIM) weight and find your chargeable weight for DHL, FedEx, UPS air express, standard air freight, sea freight, and road freight — instantly.
Volumetric weight — also called dimensional weight or DIM weight — is a freight pricing concept that gives a cargo's volume an equivalent weight value. Carriers apply this because aircraft, trucks, and cargo holds have finite space: a large, lightweight package occupies just as much space as a heavy one, but generates far less revenue if charged only by actual weight.
The practical consequence for shippers: if your package is large relative to its weight, you will almost certainly pay more than the actual weight would suggest. Understanding this before you ship — and designing your packaging accordingly — is one of the most actionable ways to control shipping costs.
Volumetric Weight (kg) = (Length × Width × Height in cm) ÷ DIM Factor
Different carriers and shipping methods use different DIM factors, which directly affects how much you pay for the same size package.
| Shipping Method | DIM Factor (cm³/kg) | Carrier Examples | Best For |
|---|---|---|---|
| Air Express | 5000 | DHL, FedEx, UPS, Aramex | Time-sensitive small parcels |
| Standard Air Freight | 6000 | General air cargo | Non-urgent larger air shipments |
| Sea LCL | 6000 | LCL consolidators | Shared container small shipments |
| Sea FCL / Standard | 1000 (=1 tonne/CBM) | Ocean liner carriers | Full container loads |
| Road Freight | 3000 | Ground trucking | Domestic or regional road transport |
Chargeable weight is simply the higher of actual weight or volumetric weight. This is the number the carrier multiplies by their rate per kg to calculate your freight cost. If your actual weight is 5kg but your volumetric weight is 12kg, your shipping bill is calculated on 12kg — regardless of how light the package actually is.
💡 Example: A box of bubble wrap measuring 80 × 60 × 50 cm weighing 3kg. Volumetric weight at DHL air express (5000 factor) = (80 × 60 × 50) ÷ 5000 = 240,000 ÷ 5000 = 48kg. Chargeable weight = 48kg. At $5/kg, shipping cost = $240 — for a package that physically weighs 3kg. This is why packaging design matters so much for air freight cost.
While the underlying formula is the same, the DIM factor differs by carrier and by service level within the same carrier. Knowing which factor applies to your shipment prevents surprise invoices.
All three major air express couriers use a DIM factor of 5000 for international shipments. This means: for every 5,000 cm³ of package volume, 1kg of volumetric weight is assessed. A 50 × 40 × 30 cm package has a volume of 60,000 cm³, giving a volumetric weight of 60,000 ÷ 5,000 = 12kg.
These carriers apply this consistently across their international express networks, regardless of whether the service is overnight, 2-day, or economy express. The DIM factor applies to the outer carton dimensions, including any bubble wrap, foam padding, or box corners — so what you add for protection directly increases your shipping cost.
Standard air cargo (booked through freight forwarders rather than express courier accounts) typically uses a DIM factor of 6000, which produces a lower volumetric weight for the same package size. This makes standard air freight relatively more economical for low-density cargo than express services — at the cost of longer transit times and less tracking granularity.
Sea freight operates on a different model: the standard ratio is 1 CBM of volume = 1 metric tonne (1,000 kg) of weight. If your cargo weighs less than 1,000 kg per CBM — as most consumer goods do — you pay by volume. Sea LCL services sometimes use a 6,000 DIM factor for smaller parcels, similar to air freight. For full container loads (FCL), you pay a flat container rate regardless of weight or volume up to the container's limit, making per-CBM volumetric weight calculations less relevant.
Road freight in most markets uses a DIM factor of 3,000, positioning it between air (5,000-6,000) and sea standard (1,000) in its sensitivity to cargo volume. This makes road a good middle ground for dense-but-not-heavy shipments on regional routes.
Reducing volumetric weight is one of the highest-ROI packaging decisions a business can make, particularly for e-commerce sellers and importers shipping by air express regularly.
💡 Quick Win: If you ship regularly by DHL, FedEx, or UPS, run every carton size through this calculator before you print the final production run of your packaging. A 5cm reduction in any single dimension across thousands of shipments can add up to meaningful annual freight savings.
Volumetric (DIM) weight is a calculated weight based on a package's size. Carriers charge based on whichever is higher — actual weight or volumetric weight — to ensure space-intensive cargo generates appropriate revenue.
Volumetric weight = (Length × Width × Height in cm) ÷ DIM factor. For DHL/FedEx/UPS air express: ÷ 5000. Standard air freight: ÷ 6000. Road freight: ÷ 3000.
All three use a DIM factor of 5000 for international air express. This means 1 kg of volumetric weight = 5,000 cm³ of package volume.
The higher of actual weight or volumetric weight. This is the weight used to calculate your freight charge, regardless of which is physically heavier.
Use right-sized boxes, minimize void fill, vacuum-seal soft goods, use flat mailers for flat items, and compare DIM factors across carriers before booking.
Yes — sea freight uses CBM (cubic meters) as the volume measure, with 1 CBM = 1 metric tonne as the standard ratio. Use our CBM Calculator for sea freight volume estimates.
Because cargo holds have limited space. Large lightweight packages take as much space as heavy compact ones but weigh far less. Volumetric pricing ensures carriers are compensated for space used, not just mass carried.
A higher DIM factor produces a lower volumetric weight for the same package, meaning lower charges. Standard air freight at 6000 is less volumetrically punishing than air express at 5000.
Yes — completely free, no registration. Supports cm/kg and in/lb, covers all major shipping methods and carriers.