物流工具 Shipping Tool

Dimensional Weight Calculator

Q: Do USPS and other carriers always use the same DIM factor?

No. DIM factors vary by carrier, service type, destination, and contract terms.

Calculate dimensional weight, compare it with actual weight, and determine the billable weight with inch/lb or cm/kg units.

Package Visualization

The box shape scales with your current length, width, and height inputs.

DIM Weight Calculator Tool

Unit system

DIM factor preset

Length (in)

Width (in)

Height (in)

Actual weight (lb)

Custom DIM factor (optional) 输入自定义计费系数将覆盖预设值。 Custom DIM factor overrides preset value.

DIM Factor Conversion Tool

DIM factor value

Source unit

What Is Dimensional Weight

Dimensional weight (also called volumetric weight) estimates shipping weight from parcel size. Carriers use it to account for vehicle and sortation space, not only physical mass.

For eCommerce and 3PL teams, this means oversized but lightweight parcels can be billed higher than expected if package dimensions are not optimized.

How Billable Weight Works

Billable weight is the greater of actual weight and DIM weight. If package volume creates a larger DIM value, carriers usually bill using DIM weight.

Billable Weight Rule The greater of actual weight and dimensional weight

Common DIM Factors

以下为行业常见近似对照，不同承运商和产品线可能采用不同规则，请以实际计费规则为准。 These are common industry approximations. Actual DIM factors may differ by carrier and service tier.

inch/lb	cm/kg (approx.)
139	5000
166	6000
194	7000
220	8000
250	9000

Actual Weight vs DIM Weight

Actual weight is the scale-measured parcel mass. DIM weight is calculated from length, width, and height using a DIM factor. Carriers typically bill by whichever is higher.

Formula mode	Calculation
inch / lb	体积重（lb）= 长度(in) × 宽度(in) × 高度(in) ÷ 计费系数 DIM Weight (lb) = Length(in) × Width(in) × Height(in) / DIM Factor
cm / kg	体积重（kg）= 长度(cm) × 宽度(cm) × 高度(cm) ÷ 计费系数 DIM Weight (kg) = Length(cm) × Width(cm) × Height(cm) / DIM Factor

Actual weight vs DIM weight

Actual weight is what the parcel physically weighs. DIM weight is a calculated weight based on parcel volume. Billing usually uses the larger of the two.

How billable weight works

Billable weight is determined by max(actual weight, dimensional weight). This result should be used when evaluating shipping cost impact.

先用该工具完成尺寸与重量画像，再进入费率对比提交业务资料。 Use this tool first, then submit your profile in rate comparison.
若包装规格波动较大，建议结合物流测算器评估承运商组合。 If packaging variance is high, combine this with Shipping Calculator to evaluate carrier mix.
查看承运商目录与 USPS 页面，结合尺寸结构评估更合适的履约路径。 Review the carrier directory and USPS page to align DIM impact with carrier fit.
若计划系统化接入，可继续阅读 Shipping API 或直接进入演示预约。 If you plan system onboarding, continue to Shipping API or go straight to Book a Demo.

FAQ

What is dimensional weight?

Dimensional weight is a billing method based on parcel volume instead of actual weight.

How do you calculate dimensional weight?

Use Length × Width × Height ÷ DIM Factor, then compare against actual weight in carrier billing rules.

What is the difference between actual weight and dimensional weight?

Actual weight is measured on a scale, while dimensional weight is calculated from package dimensions and DIM factor. Billing usually uses the higher value.

How do carriers determine billable weight?

Carriers usually compare actual and dimensional values, then bill by the higher one.

What DIM factor should I use?

Start with common presets, then confirm the exact factor from your carrier service policy.

Why is 139 commonly used?

139 is a widely used reference factor in U.S. parcel services, but the final DIM factor depends on carrier and service type.

Is dimensional weight the same as volumetric weight?

Yes. In most logistics contexts, dimensional weight and volumetric weight refer to the same billing concept.

Do USPS and other carriers always use the same DIM factor?

No. DIM factors can vary by carrier, service, destination, and contract terms, so confirm with the active billing policy.

Need a cost review based on parcel dimensions?

Submit your shipment profile and use dimensional context to get a practical rate comparison recommendation.

Get Rate Comparison Book a Demo