Calculate dimensional (DIM) weight instantly for all major US carriers. Enter your package dimensions and actual weight — the calculator applies the correct carrier divisor (UPS/FedEx: 139, USPS: 166, DHL: 139) and tells you whether actual weight or DIM weight determines your shipping cost. Supports both imperial (inches/lbs) and metric (cm/kg). Free, no signup required.
💡 Quick Tip: Carriers always charge whichever is greater—actual weight or dimensional weight. For light, bulky packages (like pillows or furniture), DIM weight usually determines your shipping cost. Use this calculator before shipping to estimate charges and avoid surprises.
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This tool now supports both Imperial (lbs/in) and Metric (kg/cm).
Learn how to accurately calculate dimensional weight, reduce shipping costs, and understand carrier-specific rules.
Learn how to calculate DIM weight → History of DIM weight pricing →Dimensional weight (also called DIM weight or volumetric weight) is a pricing method used by shipping carriers to account for package size, not just weight. Instead of charging based solely on how heavy a package is, carriers calculate a "dimensional weight" based on the space your package occupies in their truck or plane. You're then charged for whichever is greater: the actual weight or the dimensional weight.
This system was introduced because lightweight but bulky items (like pillows, lampshades, or furniture) take up valuable cargo space but weigh very little. Carriers use DIM weight to ensure they're compensated fairly for the space consumed, not just the pounds carried.
The dimensional weight formula is straightforward:
(Length × Width × Height) ÷ DIM Factor = Dimensional Weight
Step-by-step process:
Each shipping carrier uses different DIM factors (also called DIM divisors). Here's what to use:
| Carrier | Service Type | DIM Factor | Units |
|---|---|---|---|
| UPS | Daily rates / Most common | 139 | inches/lbs |
| FedEx | Express & Ground | 139 | inches/lbs |
| USPS | Priority Mail / Retail | 166 | inches/lbs |
| DHL | Express domestic | 139 | inches/lbs |
| LTL Freight | Domestic trucking | 194 | inches/lbs |
| International | Courier/express (metric) | 5000 | cm/kg |
| Air Freight | Standard international | 6000 | cm/kg |
Choose the smallest box that safely fits your items. Every inch matters—a box that's 2 inches too large in each dimension can significantly increase your DIM weight.
Regional carriers like OnTrac or LSO sometimes use more favorable DIM divisors than national carriers, potentially saving you money on bulky shipments.
Clothing, textiles, and soft items can often ship in poly mailers instead of boxes, reducing dimensional measurements significantly.
If shipping multiple items to the same customer, combine them into one box when possible. This reduces total dimensional weight compared to multiple packages.
High-volume shippers can negotiate better DIM divisors with carriers. If you ship 100+ packages weekly, ask your carrier rep about custom pricing.
Minimize void fill and protective packaging where safe to do so. Air pillows and foam peanuts add volume without adding protection for many products.
Always use this dimensional weight calculator BEFORE choosing your box size. Testing different box options before packing can reveal significant cost savings.
Dimensional weight pricing applies to most commercial shipping services, but there are some exceptions:
Let's say you're shipping a large box of pillows via UPS:
Calculation:
(24 × 18 × 12) ÷ 139 = 5,184 ÷ 139 = 37.3 lbs
Result: Even though your package only weighs 5 lbs, you'll be charged for 38 lbs (rounded up) because the dimensional weight (37.3 lbs) is greater than the actual weight (5 lbs). This is why using the smallest possible box is crucial for lightweight, bulky items.
Dimensional weight (DIM weight or volumetric weight) is a pricing method where carriers charge based on package size rather than actual weight. It's calculated by multiplying length × width × height and dividing by a carrier-specific DIM factor.
To calculate DIM weight: (1) Measure length, width, and height in inches, (2) Multiply L × W × H to get cubic inches, (3) Divide by the carrier's DIM factor (139 for UPS/FedEx, 166 for USPS), (4) The result is your dimensional weight in pounds.
Use 139 for UPS/FedEx daily rates (most common), 166 for USPS and some retail rates, 194 for domestic LTL, 5000 for international courier (metric), or 6000 for standard air freight (metric). Need carrier-specific calculations? Use our dedicated USPS DIM Weight Calculator, FedEx DIM Weight Calculator, or UPS DIM Weight Calculator.
Carriers charge whichever is GREATER between actual weight and dimensional weight. For light, bulky packages, dimensional weight is usually higher. For dense, heavy packages, actual weight is usually higher.
Yes! Switch to Metric mode using the toggle. Use DIM factor 5000 for international courier/express or 6000 for standard air freight. The calculator supports both kg/cm (metric) and lbs/in (imperial).
You're being charged dimensional weight because your package is light but takes up significant space in the truck/plane. Carriers use DIM weight to ensure they're compensated for the space consumed, not just the weight.
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Calculate →💡 Pro Tip: After calculating dimensional weight, use our freight class calculator to determine LTL classification