Calculator
Example data table
Sample packages showing how dimensional weight can exceed actual weight.
| Length | Width | Height | Units | Divisor | Actual | Dim (rounded) | Billable |
|---|---|---|---|---|---|---|---|
| 18 | 14 | 12 | in/lb | 139 | 10.0 lb | 22.0 lb | 22.0 lb |
| 40 | 20 | 18 | in/lb | 166 | 60.0 lb | 87.0 lb | 87.0 lb |
| 60 | 40 | 40 | cm/kg | 5000 | 12.0 kg | 20.0 kg | 20.0 kg |
Formula used
- Volume = Length × Width × Height
- Dimensional Weight = Volume ÷ Divisor
- Rounded Dim Weight = apply your selected rounding rule
- Billable Weight = max(Actual Weight, Rounded Dim Weight)
- Total Billable = Billable Weight per Package × Quantity
Use the divisor stated by your carrier or rate card to match invoices.
How to use this calculator
- Select units that match your measurements.
- Enter package length, width, and height.
- Add actual weight per package, if available.
- Choose a divisor from your shipping agreement.
- Select a rounding method used by your carrier.
- Press Calculate to see billable and total weights.
- Download CSV or PDF to share with your team.
FAQs
1) What is dimensional weight?
Dimensional weight estimates shipment space usage. Carriers compare it with actual weight and charge for the higher value to cover capacity costs.
2) Why do carriers use different divisors?
Divisors vary by carrier, service level, and contract terms. A smaller divisor increases dimensional weight, which raises billable weight for bulky items.
3) Should I use inches or centimeters?
Use the measurement system printed on your packaging workflow. Mixing units with the wrong divisor can significantly misstate chargeable weight.
4) How does rounding affect my bill?
Many carriers round up dimensional weight to the next whole unit. For borderline shipments, rounding can push billable weight into a higher pricing tier.
5) What if I do not know the actual weight?
You can leave actual weight at zero to see dimensional-only estimates. Add actual weight later to confirm the billable comparison.
6) Does this work for multi-piece shipments?
Yes. Enter per-package dimensions and weight, then set quantity. The calculator multiplies the billable weight per package by quantity.
7) What is the best divisor to choose?
Use the divisor from your carrier contract or rate card. If you ship across services, calculate each scenario and compare invoice risk.
8) Can I use this for freight class pricing?
It supports chargeable weight estimation, not class determination. Freight class can depend on density, handling, liability, and carrier rules.