DHL Express · metric
40 × 30 × 50 cm · actual weight 8 kg
40 × 30 × 50 ÷ 5,000 = 12 kg- Dimensional
- 12 kg
- Actual
- 8 kg
- Billable
- 12 kg
Dimensional weight is greater than actual weight, so the estimate uses 12 kg.
Billable weight calculator
Know when you’re
paying to ship air.
Compare actual and dimensional weight across DHL, FedEx, and UPS. See the exact rule behind the number before you quote a shipment.
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Your shipment, piece by piece.
Quick answer
How dimensional weight becomes billable weight.
Dimensional weight converts the space a package occupies into a weight. Carriers compare it with the package’s actual weight, and the greater value usually becomes the billable weight used to calculate the shipping rate.
Dimensional weight = L × W × H ÷ divisorBillable weight = greater of actual or dimensional weightCarrier rules
Choose the rule that matches your rate.
These are estimation defaults, not quotes. Contract, service, route, and measurement rules can change the final charge.
| Carrier rule | Divisor | Rounding | Applies to | Source |
|---|---|---|---|---|
| DHL Express | 5,000 cm/kg · 139 in/lb | Use the outer dimensions entered; confirm service-specific rounding. | Most international Express shipments | DHL weight and dimensions guide ↗ |
| FedEx US | 139 in/lb | Round each fractional inch and the resulting pound fraction up. | US package services; documented exceptions may use another factor | FedEx 2026 Service Guide · pp. 135–136 ↗ |
| UPS US Daily | 139 in/lb | Round each dimension and the resulting pound fraction up. | UPS US Daily Rates | UPS package dimensions and weight guide ↗ |
| UPS US Retail | 166 in/lb | Round each dimension and the resulting pound fraction up. | UPS US Retail Rates | UPS package dimensions and weight guide ↗ |
The method
One formula. Two weights. No black box.
Dimensional weight converts the space a parcel occupies into a weight. Each package is evaluated separately, then the billable weights are added together.
- 01
Measure the outer box
Use the longest points, including bulges. Carrier-specific dimension rounding is applied where the official rule states it.
- 02
Calculate dimensional weight
Multiply length, width, and height, then divide by the selected carrier factor.
- 03
Keep the greater weight
Compare dimensional and actual weight for each package. The greater value becomes the estimated billable weight.
Worked examples
See exactly which weight wins.
The examples use the same carrier profiles and rounding sequence as the calculator.
FedEx US · imperial
15.2 × 10.1 × 4.4 in · actual weight 3.2 lb
16 × 11 × 5 ÷ 139 = 6.33 lb → 7 lb- Dimensional
- 7 lb
- Actual
- 4 lb after rounding
- Billable
- 7 lb
FedEx rounds the dimensions and pound fractions up before comparing the two weights.
FAQ
Questions behind the number.
Short answers for quoting decisions, with the edge cases kept visible.
What is dimensional weight?
Dimensional weight, also called volumetric weight, converts a package’s volume into a weight so a carrier can account for the space the package occupies.
What is billable weight?
Billable weight is the weight used to calculate the transportation rate. For the rules covered here, it is generally the greater of actual weight and dimensional weight.
Why do divisors 139 and 166 produce different results?
A smaller divisor produces a higher dimensional weight for the same box. UPS identifies 139 for US Daily Rates and 166 for US Retail Rates; the selected rate type therefore matters.
Do carriers round package dimensions first?
FedEx US and UPS US instruct shippers to round fractional inch measurements up before calculating package dimensional weight. DHL rules can vary by service, market, and contract, so confirm the final rule before quoting.
Is dimensional weight calculated per package or per shipment?
ParcelMath evaluates each package separately and then totals the billable weights. Some FedEx services can apply dimensional weight on a shipment basis, so confirm the service-specific guide for a final quote.
Why might the carrier invoice differ from this estimate?
Carriers may remeasure a package, apply minimum billable weights, service-specific rules, contract terms, route exceptions, and surcharges that this calculator does not include.
Sources
Rules you can inspect.
DHL Express5,000 metric divisorOfficial weight & dimensions guide ↗
verified
Confirm service, contract, route, and final rounding with DHL before quoting.
FedEx US139 imperial divisor2026 Service Guide · pp. 135–136 ↗verified
US guide estimate only; contract rates, service minimums, and surcharges are excluded.
UPS US139 daily / 166 retailOfficial package dimensions & weight guide ↗verified
US Daily and Retail estimates only; negotiated rates and service exceptions are excluded.
Rules last verified July 27, 2026. This calculator does not provide carrier quotes.