What Is Volumetric Weight (Desi) and How Is It Calculated?

Desi is the unit the cargo industry uses to convert the volume a parcel occupies into a standard weight value. The logic: space in a cargo vehicle fills with volume more than weight; one kilo of feathers can fill a sofa while one kilo of iron fits in a small box. So carriers use "volumetric weight" — desi — so as not to under-charge light-but-bulky parcels. Formula: Desi = (Width × Length × Height) / 3000; dimensions in centimetres, the result in desi. The divisor of 3000 is the industry standard (some international shipments use 5000). Example: for a 30 cm × 20 cm × 15 cm box the calculation is (30 × 20 × 15) / 3000 = 9000 / 3000 = 3 desi. So that box is priced at a minimum of 3 desi regardless of its real weight. Knowing desi is the only way to estimate cargo cost correctly before setting a price.

Formula: Desi = (Width × Length × Height) / 3000, dimensions in cm. If the real weight (kg) is greater, the carrier charges the real weight.

Enter box dimensions, get desi and cargo cost instantly

Carriers compare two values: the parcel's volumetric weight (desi) and its real (scale) weight. The bill is based on whichever is greater. Example: a box calculated at 3 desi is priced on 5 units if it holds a 5 kg product; but the same box holding a 1 kg fluffy pillow is priced on 3 desi. Why does this matter? Because it determines which class your product falls into. For dense, heavy products (such as metal or liquid) the real weight dominates; for light, bulky products (such as pillows, lampshades, toys) desi dominates. Sellers often look only at the product's kg weight and are surprised when they see the cargo bill on bulky items. The right approach is to calculate both desi and real weight for every product and take the greater as the cost.

Marketplaces (Trendyol, Hepsiburada, Amazon) publish desi-based bracket tables with their contracted carriers. These tables apply a fixed price by desi range: for example one price for 0-1 desi, another for 2 desi, then 5, 10, 20, 30 desi at increasing prices. An important detail: tariffs are usually stored excluding VAT, and 20% VAT is added to the order. Another critical point is that after a certain desi (often above 30) the price jumps sharply; on bulky products the cargo can approach the product cost. Also, on most marketplaces the seller bears the cargo on orders below a certain basket value. So knowing your product's desi class and which bracket it falls into is essential to set the price and the "free shipping threshold" correctly. Ecomiro's commission calculator pulls the relevant cargo cost from the bracket table automatically when you enter the desi.

For the same desi, carriers price differently, and the difference turns into large amounts at volume. Among the carriers commonly used in Turkey are Aras, Yurtiçi, MNG/DHL eCommerce, PTT, Sürat and the HepsiJET that Hepsiburada mandates. Some marketplaces choose the carrier automatically (Trendyol from contracted firms), while others require a specific firm (HepsiJET on Hepsiburada). In choosing a carrier, evaluate not only price but also delivery speed, branch/point density, damage and loss rate, and return convenience — a cheap but slow carrier creates indirect cost by lowering store rating. Sellers shipping regularly can negotiate special rates as volume grows. The key is to know each firm's desi-price table and pick the firm best suited to the product profile (heavy, bulky or fragile).

Most of the desi cost comes from packaging, and this is one of the few line items a seller directly controls. A few practical methods: choose a box that fits the product with no wasted space (a big box equals wasted desi); vacuum or roll compressible items (textiles, pillows); ship dismountable products disassembled; and choose corner and filling material that does not create volume. Example: a 40×30×30 cm box is 12 desi; fit the same product into a 30×25×20 cm box and it drops to 5 desi, nearly halving the cargo. This optimisation looks small per order but means serious savings across thousands of monthly orders. Also, a correct (not oversized) desi declaration prevents the carrier from re-measuring and issuing a difference invoice. Setting the ideal box size once for each product delivers a lasting gain.

Desi declaration carries two-way risk. Declare too large and you pay needless extra cargo. Declare too small and the carrier does its own measurement and invoices the difference later; consistent under-declaration can lead to penalties and contract problems. So an accurate declaration matters for both cost and trust. The other critical issue is the carrier overcharging with a wrong (high) desi measurement; automatic weighing/measuring systems occasionally err and the seller pays more without noticing. In that case, with the shipment's dimensions and a photo, the difference can be reclaimed by objection. Catching these differences one by one across hundreds of shipments is impossible manually; you must compare each order's declared desi with the invoiced desi. Ecomiro's shipping module does this comparison automatically and produces an objection form for overcharges.