The rule that sets your shipping fee
Couriers bill the higher of two numbers: what your parcel weighs, and what its size says it "should" weigh. The second is the volumetric weight:
Volumetric weight (kg) = length × width × height (cm) ÷ 5,000
5,000 is the most common divisor and the one in Shopee's published formula. Some couriers use a different number, so check your rate card. Most rate cards then round up to the next 0.5 kg or 1 kg.
For light products like clothes, plush toys, packaging-heavy gadgets and anything in a big retail box, size usually wins. That's where the savings are.
Box sizes that fit each weight tier
At a divisor of 5,000, each 0.5 kg tier allows 2,500 cm³ of box. Here's the biggest box that keeps you in each tier, with a practical size that fits:
| Billed weight | Max box volume | Example box |
|---|---|---|
| 0.5 kg | 2,500 cm³ | 20 × 12.5 × 10 cm |
| 1 kg | 5,000 cm³ | 25 × 20 × 10 cm |
| 1.5 kg | 7,500 cm³ | 30 × 25 × 10 cm |
| 2 kg | 10,000 cm³ | 40 × 25 × 10 cm |
| 3 kg | 15,000 cm³ | 40 × 25 × 15 cm |
These only hold if the actual weight is also under the tier. A 1.2 kg item in a 5,000 cm³ box is still billed as 1.5 kg.
A real difference
Say you ship a 0.8 kg item in a 30 × 20 × 10 cm box. That's 6,000 cm³, or 1.2 kg volumetric, billed as 1.5 kg. Move it into a 25 × 18 × 10 cm box (4,500 cm³) and it's billed as 1 kg.
Half a kilo per parcel doesn't sound like much. Across a few hundred orders a month, it adds up to real money, whether you pay shipping yourself or your buyers see a lower shipping fee at checkout and convert better.
Packing habits that save money
- Stock two or three box sizes that match your best sellers. One "fits everything" box is the most expensive choice.
- Use poly mailers for soft goods. Clothes, fabric and soft accessories don't need a box, and a mailer follows the shape of the product.
- Remove retail packaging when it's safe. Some items ship in a bulky display box. If the buyer doesn't need it, pack the item without it, and say so in the listing.
- Trim tall boxes. Cut the sides down to the product's height and fold the flaps.
- Measure the packed parcel, not the empty box. Bubble wrap and fillers count.
- Declare honest dimensions. If the courier measures a bigger parcel than you entered, you can be charged the difference.
Check any box in seconds
Use the volumetric weight calculator to test a box before you buy a batch. It shows whether size or weight decides your fee, and the largest box that keeps you in the same tier.