Are you paying for weight, or for air?
Couriers bill the greater of actual and volumetric weight. If your parcels are light and bulky, you are almost certainly paying for the box rather than the contents. Enter your dimensions to find out.
Your parcel
Measure the packed box, not the product. Round up to the nearest centimetre.
What you are billed on
That is 260% above your actual weight. Shrinking the box by about 72% in volume would move you onto actual weight.
Box volume: 7,200 cm³. Record this alongside the packed weight at dispatch — dimensions are what let you challenge a volumetric charge, and mass alone will not refute one.
- Volumetric weight prices the space a parcel occupies, derived from its dimensions.
- Couriers bill whichever is greater — actual or volumetric. Light bulky goods lose here.
- The divisor matters: 5000 is common in India, but 4000 and 6000 are both in use.
- Shrinking the box only saves money if volumetric is currently the billable figure.
- Record dimensions AND weight at dispatch — mass alone cannot refute a volumetric charge.
Couriers sell space, not weight
A delivery vehicle fills up by volume long before it hits a weight limit. A courier carrying large light parcels earns less per trip than one carrying dense ones, which is why volumetric pricing exists at all. It is not a penalty — it is capacity pricing.
For sellers this creates a specific, fixable inefficiency: void fill and oversized cartons cost real money on every single shipment. Standardising to boxes that actually fit your products is one of the few operational changes with an immediate, permanent effect on freight.
Knowing what you shipped, months later
A volumetric charge is only disputable if you can show what the box actually measured. Most sellers cannot, because nobody records dimensions at dispatch — and by the time a questionable charge appears on a settlement, the parcel is long gone.
Robnu is an agentic OMS. It captures weight and dimensions as part of processing the order, so when a shipping deduction arrives it already holds both sides of the comparison. Charges billed above what the shipment actually was become prepared claims — a rare approval click while fully-autonomous filing rolls out.
You sell. Robnu runs the rest — and makes sure every rupee is paid correctly.
Volumetric weight, answered
It is a weight figure derived from a parcel's dimensions rather than its mass, representing the space it occupies in a vehicle. Couriers use it because a large light box consumes capacity that a small heavy one does not. You are billed on whichever is greater — actual or volumetric.
Length multiplied by width multiplied by height in centimetres, divided by a divisor set by the courier. The divisor is the part that varies: 5000 is common for surface shipments in India, but some partners use 4000 or 6000. Check your contract, because the divisor materially changes the result.
Almost certainly because volumetric weight exceeded actual weight. This is the standard cause of unexpected freight on light, bulky goods — cushions, garments, anything packed with generous void fill. The charge is not an error; it reflects the space you booked.
Only if volumetric weight is currently the billable figure. If you are already billed on actual weight, shrinking the box changes nothing for that shipment. The calculator above tells you which side you are on, which is the first thing to establish before redesigning packaging.
It varies by partner and service. 5000 is the most commonly encountered for surface shipments, with 4000 and 6000 also in use. Because the divisor sits in the denominator, a change from 5000 to 4000 increases volumetric weight by a quarter — which is why assuming rather than checking is expensive.
With dimensions, not just mass. If the charge is volumetric, showing what the parcel weighed proves nothing — you need the recorded box dimensions to challenge the calculation. This is why recording both weight and dimensions at dispatch is the habit that makes disputes winnable.