Every courier — Blue Dart, Delhivery, DTDC and Shiprocket in India, or UPS, FedEx and USPS in the United States — bills a parcel on its chargeable weight, not simply on what the scale shows. This free volumetric weight calculator for courier shipments (also called a dimensional or DIM weight calculator) works out that number from the length, width and height of your box, so you can quote shipping correctly, choose better packaging and avoid adjustment charges after pickup.
How to Calculate Volumetric Weight
Calculating volumetric (dimensional) weight takes less than a minute. Follow these five steps for any carton, poly bag or flyer:
- Measure the packed parcel, not the product. Take the length, width and height at the outermost points, including bulges, flaps and tape. Round each side up to the nearest whole centimetre, as most couriers do.
- Multiply the three sides. Length × Width × Height gives the volume of the box in cubic centimetres (cm³).
- Divide by the courier divisor. In India, use 5000 for most domestic services (4000 for many air express products, 6000 where your rate card says so) to get kilograms. In the USA, measure in inches and divide by 139 to get pounds.
- Weigh the parcel. Use a calibrated digital scale to get the actual dead weight, including packaging.
- Pick the higher number. The greater of dead weight and volumetric weight is your chargeable weight. Indian couriers usually round it up to the next 0.5 kg slab; US carriers round up to the next whole pound.
The calculator above does steps 2, 3 and 5 automatically and shows the result as you type, whether you measure in centimetres or inches.
The Mathematical Formula
The volumetric weight formula with divisor 5000 is the industry standard for domestic shipping in India:
Volumetric weight formula
Volumetric Weight (kg) = L (cm) × W (cm) × H (cm) ÷ 5000
Chargeable Weight = max(Dead Weight, Volumetric Weight)
The divisor 5000 means the courier expects one cubic metre of cargo to weigh at least 200 kg (1,000,000 cm³ ÷ 5000). A divisor of 4000 raises that benchmark to 250 kg per cubic metre, which produces a higher volumetric weight, while 6000 lowers it to about 167 kg and is more lenient on bulky goods.
| Units | Divide by | Typical use |
|---|---|---|
| cm → kg | 5000 | Standard domestic courier |
| cm → kg | 4000 | Express / air |
| cm → kg | 6000 | Surface / select services |
| inches → kg | 305 | Inch equivalent of 5000 |
| inches → lb | 139 | UPS, FedEx, USPS (USA) |
| inches → lb | 166 | Retail / older rate cards |
Worked example
A carton measuring 45 × 35 × 25 cm weighs 4 kg on the scale. Its volume is 39,375 cm³. Dividing by 5000 gives a volumetric weight of 7.88 kg. Because 7.88 kg is higher than 4 kg, the chargeable weight is 7.88 kg, and a courier billing in 0.5 kg slabs will charge for 8 kg.
Volumetric Weight vs Dead Weight
Dead weight (actual weight) is what your parcel physically weighs. Volumetric weight represents how much space it takes up in a truck, van or aircraft hold. Couriers are limited by both: a vehicle can run out of space long before it reaches its weight limit.
Think of two parcels that each weigh 2 kg. One is a dumbbell in a small box; the other is a pillow in a large carton. The pillow fills five times more space, so charging both the same would make light, bulky goods unprofitable to carry. Comparing the two weights and billing the higher one keeps pricing fair for the space each shipment uses.
In practice, light but bulky items such as clothing, lampshades, plastic containers and toys are usually billed on volumetric weight, while dense items such as books, auto parts, tools and liquids are billed on dead weight. Aggregators re-measure parcels at hubs, so declaring the wrong figure leads to weight-discrepancy charges later.
Comparison Table: Billable Weight Examples
The table below uses the standard Indian divisor of 5000. The billable weight is the higher of the actual and volumetric weight. US examples in inches and pounds follow in the next section.
| Box size (cm) | Volumetric wt. | Actual wt. | Billable wt. | Billed on |
|---|---|---|---|---|
| 30 × 20 × 10 | 1.20 kg | 2.00 kg | 2.00 kg | Dead |
| 35 × 25 × 5 | 0.88 kg | 0.50 kg | 0.88 kg | Volumetric |
| 25 × 20 × 15 | 1.50 kg | 1.00 kg | 1.50 kg | Volumetric |
| 40 × 30 × 20 | 4.80 kg | 3.00 kg | 4.80 kg | Volumetric |
| 50 × 40 × 30 | 12.00 kg | 8.50 kg | 12.00 kg | Volumetric |
| 60 × 40 × 40 | 19.20 kg | 22.00 kg | 22.00 kg | Dead |
DIM Weight Calculator for USA: UPS, FedEx & USPS
US carriers call volumetric weight dimensional weight or DIM weight, and they work in inches and pounds. Select the USA region in the calculator above and it switches to inches, pounds and the 139 divisor automatically.
US DIM weight formula
DIM Weight (lb) = L (in) × W (in) × H (in) ÷ 139
Billable Weight = max(Actual Weight, DIM Weight), rounded up to the next whole lb
UPS and FedEx apply the 139 divisor to daily-rate shipments. USPS lowered its divisor from 166 to 139 on July 12, 2026 for Priority Mail, Priority Mail Express, USPS Ground Advantage and Parcel Select. USPS charges DIM weight only on packages larger than 1,728 cubic inches (one cubic foot) and rounds each side up to the next whole inch before multiplying, so a 12.2-inch side counts as 13 inches.
| Box size (in) | DIM wt. | Actual wt. | Billable wt. | Billed on |
|---|---|---|---|---|
| 14 × 12 × 12 | 14.50 lb | 8 lb | 15 lb | DIM |
| 16 × 12 × 12 | 16.58 lb | 20 lb | 20 lb | Actual |
| 18 × 14 × 12 | 21.76 lb | 12 lb | 22 lb | DIM |
| 20 × 16 × 14 | 32.23 lb | 25 lb | 33 lb | DIM |
| 24 × 18 × 18 | 55.94 lb | 60 lb | 60 lb | Actual |
How to Reduce Your Chargeable Weight
- Right-size your boxes. Keep three or four standard carton sizes so every product ships in the tightest box that protects it.
- Cut empty space. Excess bubble wrap and void fill add volume you pay for. Use fitted inserts instead.
- Use poly mailers for soft goods. Apparel and textiles packed in flyers often weigh less on paper than in cartons.
- Declare accurate dimensions. Correct figures on your shipping panel prevent weight-discrepancy disputes in India and carrier adjustment charges in the USA.
- Ask about the divisor. High-volume shippers can sometimes negotiate a more favourable divisor in their contract.
Frequently Asked Questions
What is volumetric weight in courier?
Volumetric weight (also called dimensional or DIM weight) is the weight a courier assigns to a parcel based on the space it occupies. It is calculated as Length × Width × Height in centimetres divided by a divisor, usually 5000, and is compared with the actual weight to decide the billable weight.
Why is 5000 used as the volumetric weight divisor?
A divisor of 5000 means the courier expects every cubic metre of cargo to weigh at least 200 kg (1,000,000 cm³ ÷ 5000). It is the standard used by most Indian domestic couriers and shipping aggregators. Air express services often use 4000 (250 kg per m³), while some surface services use 6000 (about 167 kg per m³).
Is chargeable weight the actual weight or the volumetric weight?
Chargeable weight is always the higher of the two. If the parcel is light but bulky, you pay for volumetric weight; if it is small but heavy, you pay for the actual dead weight. Most couriers then round it up to the next 0.5 kg slab.
How do I calculate volumetric weight in inches?
Multiply length, width and height in inches, then divide by 139 to get the DIM weight in pounds, as UPS, FedEx and USPS do. To get kilograms instead, divide by 305 (the inch equivalent of the 5000 cm divisor). You can also switch this calculator to the USA region and it converts automatically.
What DIM divisor do UPS, FedEx and USPS use in 2026?
UPS and FedEx use a DIM divisor of 139 cubic inches per pound. USPS lowered its divisor from 166 to 139 on July 12, 2026 for Priority Mail, Priority Mail Express, USPS Ground Advantage and Parcel Select. USPS applies DIM weight only to packages larger than 1,728 cubic inches (one cubic foot) and rounds each dimension up to the next whole inch.
How can I reduce the volumetric weight of my shipment?
Use the smallest box that safely fits the product, cut down excess void fill, ship soft items in poly mailers and flat-pack items where possible. Even a 2–3 cm reduction on each side can cut the billable weight by a full slab.
Disclaimer: Results are estimates for planning. Divisors, minimum weights, size thresholds and rounding rules vary by courier, carrier and service — always confirm with your current rate card or carrier tariff.