Dimensional Weight Explained (With Examples)

Dimensional weight (also called volumetric weight) is a pricing method used by carriers to account for how much space a package takes up, not just how heavy it is. If your package is large but lightweight, you may be charged based on dimensional weight instead of actual weight.

What Is Dimensional Weight?

Carriers have limited space on planes and trucks. A big box of light items can take up more room than a small, heavy box—so carriers use dimensional weight to price fairly based on space consumed.

In practice, you pay based on whichever is higher:

• Actual weight (scale weight), or
• Dimensional weight (size-based weight)

Dimensional Weight Formula (How It’s Calculated)

Most carriers calculate dimensional weight using a simple formula:

Dimensional Weight = (Length × Width × Height) ÷ Dimensional Factor

• Measurements are usually in cm or inches
• The dimensional factor (also called DIM divisor) varies by carrier and service level

Because factors vary, use the Boxit4me calculator for accurate estimates.

Examples (Simple, Realistic Scenarios)

Example 1: Large but light package

• Actual weight: 2 kg
• Box size: 50 × 40 × 40 cm
• Dimensional weight estimate: higher than 2 kg

Result: You may be charged based on dimensional weight (not the 2 kg you expected).

Example 2: Small but heavy package

• Actual weight: 8 kg
• Box size: 30 × 25 × 20 cm
• Dimensional weight estimate: lower than 8 kg

Result: You’ll typically be charged based on actual weight (8 kg).

Example 3: Same items, different packaging

Two orders contain the same products, but:

• Order A ships in a tight box
• Order B ships in an oversized box with lots of empty space

Result: Order B can cost more due to higher dimensional weight, even though the items are identical.

Why Your Shipping Cost Can Be Higher Than Expected

Dimensional weight surprises happen most often when you ship:

• Sneakers/shoes in original boxes
• Jackets, hoodies, and bulky apparel
• Multiple small items packed in a large outer carton
• Fragile goods shipped with lots of padding

In other words: volume can be more expensive than weight.

How to Reduce Dimensional Weight (Cost-Saving Tips)

1. Request repacking

Repacking can reduce oversized packaging and empty space, which often lowers dimensional weight and total shipping cost.

2. Consolidate orders when possible

If you’re shipping multiple parcels, consolidating and repacking together can reduce wasted space (depending on the mix of items).

3. Remove retail boxes when it makes sense

For example, removing shoe boxes can reduce volume significantly (only if you’re comfortable with it and it’s allowed for your shipment).

4. Avoid oversized packaging at checkout

When buying from some stores, you can select “minimal packaging” or reduce gift boxing options.

5. Use a shipping estimate before you ship

Enter both weight and dimensions (or best estimates) to avoid surprises.

Frequently Asked Questions

Is dimensional weight the same as volumetric weight?

Yes, these terms are commonly used interchangeably.

Do all carriers use dimensional weight?

Most major carriers do, especially for air shipments and express services.

What measurements should I use?

Use the outer box dimensions (the package as shipped), not product-only dimensions.

What if I don’t know the exact dimensions?

Use estimates based on retailer packaging and product type, then validate once your package is received and measured.

Next Step

If you want a quick estimate based on your package size and weight, you can estimate costs before shipping at Boxit4me.