A customer weighed his goods at home: 0.8kg. He knew international express starts at 1kg, so he had budgeted for 1kg. The booking came back at a billable weight of 1.5kg. The extra half-kilo was not the goods. It was the cardboard box he put them in.
The carton weighed 0.3kg. 0.8 + 0.3 = 1.1kg — barely over the 1.0kg line, which pushes the billable weight up to the next bracket: 1.5kg.
You pay for billable weight, not actual weight
Almost every international express service follows the same logic, and Forever Gain quotes on the same basis:
| Term | How it works |
|---|---|
| Actual weight | What the whole parcel weighs on the scale — including box, tape and protective material |
| Volumetric weight | Length × width × height (cm) ÷ 5000 |
| Billable weight | The greater of the two, then rounded up to the next bracket |
| Rounding | Under 21kg: 0.5kg steps ｜ 21kg and above: 1kg steps |
In other words, the number on your scale is not the number you pay for. The bracket after rounding is what sets the price.
| You weigh | Billable weight | What happened |
|---|---|---|
| 0.80 kg | 1.0 kg | Normal — the minimum bracket |
| 1.05 kg | 1.5 kg | 50 grams over 1.0kg costs a full bracket |
| 1.10 kg | 1.5 kg | The shipment in this story |
| 1.50 kg | 1.5 kg | Sitting exactly on the line — nothing wasted |
| 1.55 kg | 2.0 kg | Up another bracket |
What is one bracket worth? This is where international differs from domestic
So the mental budget of "0.8kg, I'll pay for 1kg" breaks the moment packaging is added. The quote is not wrong. The packaging ate a bracket.
How Forever Gain handles this
When shipments like this reach our Tsuen Wan warehouse, we often do — or advise the customer to do — the same three things:
- Remove the carton when it is not doing necessary protective work
- Protect with our own materials — bubble wrap, foam, edge and corner protection where the load actually sits
- Repack into a courier bag — bag plus material usually comes in under 0.2kg
| Before (carton) | After (bag + lining) | |
|---|---|---|
| Goods | 0.80 kg | 0.80 kg |
| Packaging | 0.30 kg | under 0.20 kg |
| Actual weight | 1.10 kg | 1.00 kg |
| Billable weight | 1.5 kg | 1.0 kg |
| Difference | A full 0.5kg bracket saved | |
The work is simple. The saving does not come from negotiating a rate — it comes from changing the packing structure.
But not every shipment should lose its box — we say so up front
- Glass, ceramics and anything structurally fragile
- Liquids, creams, anything that can leak
- Goods that need retail packaging intact to hold value (branded items, gifts, resale, warranty units)
- Cases where the carton itself is the load-bearing structure
- High-value goods — saving HK$80 and paying out a full claim is bad arithmetic
For ecommerce sellers: what 100–200 parcels a day looks like
HK$50 on one parcel feels minor. At 100 to 200 parcels a day it is a different order of magnitude:
| Parcels per day | Assume 30% sit just over a bracket | Saved per day (at HK$50–100 each) | Per month (22 working days) |
|---|---|---|---|
| 100 | 30 | $1,500 – $3,000 | $33,000 – $66,000 |
| 200 | 60 | $3,000 – $6,000 | $66,000 – $132,000 |
Five things you can do today
- Weigh the packed parcel, not the bare goods — box, tape and wrap included
- Know the thresholds — 1.0 / 1.5 / 2.0 / 2.5 kg. Fifty grams over costs the same as 490 grams over
- Measure and divide by 5000 to check whether volumetric weight overtakes actual weight (example below)
- Consolidate small parcels — two 0.6kg parcels are two 1.0kg brackets; combined at 1.2kg it is one 1.5kg bracket
- Do not split heavy shipments — above 21kg the steps are 1kg, and splitting adds minimum charges instead of removing them
The quieter trap: volumetric weight
Passing on weight is not the whole test. A box holding 3kg of goods:
| Box size (cm) | Volumetric weight | Actual weight | Billable weight |
|---|---|---|---|
| 40 × 30 × 25 | 30,000 ÷ 5000 = 6 kg | 3 kg | 6 kg |
| 35 × 25 × 20 | 17,500 ÷ 5000 = 3.5 kg | 3 kg | 3.5 kg |
Same goods, one size down, billable weight drops from 6kg to 3.5kg. You are paying for air.
Want to see what your parcel actually costs?
The Hong Kong to New Zealand page has a live quote tool — enter weight and dimensions and you get the billable weight and the rate on the spot.
Run an instant quote Ask us on WhatsAppWhy we bring this up unprompted
After enough years in forwarding, arranging the best available structure with carriers and suppliers is routine. That experience is worth nothing to a customer if it stays inside the company. We put solutions on the table and keep optimising them — the customer keeps the money, and we keep the next shipment and the next year.
Helping SMEs take their ecommerce business cross-border
Whether your customers are in mainland China or overseas, if your plan starts in Hong Kong we will put a proposal together at no charge. Send us a batch of real shipment records and we will recompute billable weight and review the packing structure before telling you what can be saved.
Get a proposal on WhatsApp WeChat support Call +852 2542 4466Frequently asked questions
Why was a 0.8kg shipment billed as 1.5kg?
Billable weight counts the packed parcel and then rounds up to the next bracket. 0.8kg of goods in a 0.3kg carton weighs 1.1kg, which is over the 1.0kg line, so it rounds up to the next 0.5kg bracket: 1.5kg.
What is the difference between actual weight and billable weight?
Actual weight is what the packed parcel weighs on the scale. Billable weight is the greater of actual and volumetric weight, rounded up to the next bracket — and that is the figure you pay on. They are often different.
How is volumetric weight calculated?
Length × width × height in centimetres, divided by 5000. A 40×30×25cm box is 6kg volumetric; even with 3kg of goods inside, it bills at 6kg.
What does one 0.5kg bracket cost?
On Hong Kong to New Zealand express, a 0.5kg bracket is typically HK$50 to HK$100, depending on service level and the fuel surcharge in force. That is a different order of magnitude from domestic incremental rates.
Is a bag less safe than a carton?
It depends on the goods. Solid, compression-tolerant items usually travel fine in a courier bag with proper lining. For fragile items, liquids, goods that need retail packaging intact, or cases where the carton is the load-bearing structure, we recommend keeping the box rather than risking a claim to save one bracket.
Does the same rounding apply above 21kg?
No. From 21kg the steps are 1kg rather than 0.5kg. That is why splitting a heavy shipment into several small ones usually costs more, not less — you pay several minimum charges.
Do you charge to review our shipping profile?
No. Send a batch of real shipment records and we will recompute billable weight and packaging line by line, then tell you which SKUs sit just over a bracket and what would change. If there is nothing to gain, we say so.