volumetric weight calculator.

What is volumetric weight?

Volumetric weight (also called dimensional weight or DIM weight) is a pricing technique used by courier and logistics companies to charge for the space a parcel occupies on a truck or an aircraft, not just its physical mass. A pillow, a lampshade, and a box of books may all weigh differently — but they take up very different amounts of room. Volumetric weight is how shipping companies bill for that space.

How courier companies calculate shipping charges

Couriers compare two numbers for every parcel: the actual (dead) weight measured on a scale, and the volumetric weight derived from the parcel's dimensions. They charge you for whichever is higher. This is called the chargeable weight.

For most Indian domestic couriers — Delhivery, Blue Dart, DTDC, FedEx Domestic, Shiprocket — the divisor is 5000. International air freight typically uses 5000 as well, while sea freight and certain hyperlocal couriers use 4000 or 6000.

The volumetric weight formula

Volumetric Weight (kg) = (Length × Width × Height in cm) ÷ Divisor

For a 30 × 20 × 15 cm carton with a 5000 divisor: (30 × 20 × 15) ÷ 5000 = 1.8 kg. If the actual product weighs 1.2 kg, you'll be billed for 1.8 kg — not 1.2 kg.

Why ecommerce sellers must track dimensional weight

For D2C and marketplace sellers, every gram of chargeable weight compounds across thousands of shipments. A single oversized SKU can eat 8–12% of your gross margin annually. The fix is rarely a cheaper courier — it's almost always better packaging engineering.

• Right-size your master cartons to product dimensions plus 1.5 cm on each side.
• Use die-cut inserts instead of loose-fill peanuts where possible.
• Run a quarterly audit comparing manifest weight vs invoiced chargeable weight.

Dead weight vs volumetric weight

Dead weight is what your scale shows — the literal mass of the packed parcel. Volumetric weight is a billing construct based on how much truck/aircraft space the parcel occupies. Couriers always charge the higher of the two. Dense, small items (books, electronics) are usually billed by dead weight. Light, bulky items (pillows, lampshades, apparel in oversized boxes) are billed by volumetric weight.

Tips to reduce shipping costs

1. Audit your top 20 SKUs. The 80/20 rule applies — fix the worst offenders first.
2. Standardize on 4–6 carton sizes. Don't custom-pack per order; it's slow and wasteful.
3. Negotiate divisor + zone slabs separately. Most sellers negotiate rate per kg but forget the divisor.
4. Pre-pack and weigh before booking. Avoid surcharge surprises from courier re-weighs.
5. Route by zone. Use different couriers for different zones — no one is cheapest everywhere.

Best packaging practices for D2C brands

• Use 3-ply corrugated boxes for products under 2 kg, 5-ply above.
• Branded mailers under 200 g for soft goods (apparel, accessories).
• Honeycomb wrap or kraft paper void-fill instead of bubble wrap for sustainability.
• Tamper-evident tape for high-value or fragile orders.

Common courier divisors in India

Always confirm the divisor with your account manager — it's often negotiable above ~500 shipments per month.