Dimensional Weight Calculator

Carriers charge on whichever is greater — actual weight or volumetric weight. Enter your parcel's dimensions and weight to see the billable weight, so a shipping quote never surprises you.

Need more than the free basics? Knowing the billable weight is half the battle; getting the cheapest label across carriers is the other half. A shipping platform like Sendcloud compares carriers and prints labels in bulk.

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What is dimensional weight?

A big, light box takes up space a carrier could sell to someone else, so they charge on volumetric weight when it exceeds the actual weight. The formula is (L × W × H) ÷ a divisor (commonly 5000 for cm/kg). You're billed on the higher of the two. The fix for light, bulky items: use smaller packaging — it directly lowers your shipping cost.

Frequently asked questions

What is the dimensional weight divisor?

A number (often 5000 for cm/kg) that converts a parcel's volume into a weight. (L × W × H) ÷ divisor gives the volumetric weight; carriers may use 4000–6000.

Why am I charged more than my parcel weighs?

Because the parcel is large but light — its volumetric weight exceeds its actual weight, and carriers bill on the greater of the two. Smaller boxes reduce this.

How do I lower shipping costs?

Use the smallest box that fits, and compare carriers — a platform like Sendcloud surfaces the cheapest option and discounted rates.

This tool is free and runs entirely in your browser. The link above is an affiliate link: we may earn a commission if you sign up, at no extra cost to you, and it never changes our honest take.