The shipping calculator that shows its work.
Turn finished-package dimensions into box fit, dimensional weight, carrier thresholds, pallet capacity and shipment volume— with the formula and source beside every result.
Measure once. See what the box changes.
Compare actual and dimensional weight, spot size thresholds, then carry the same carton into fit, pallet and volume decisions.
Dimensional weight governs this planning comparison.
18 × 12 × 8 ÷ 139UPS publishes divisor 139 for Daily Rates and rounds package measurements and dimensional weight up.
Use the tool that matches the question.
Each calculator works alone. Together they carry one carton from fit to billable weight to pallet and total volume.
Dimensional weight
Compare scale weight with a current, source-linked carrier rule.
Open calculatorBox comparison
See whether a tighter finished carton changes the billable result.
Open calculatorBox fit
Check every regular-grid orientation for identical rectangular items.
Open calculatorPallet planner
Balance cartons per layer against loaded height and gross weight.
Open calculatorShipment CBM
Calculate repeated-carton volume in cubic metres and cubic feet.
Open calculatorLength + girth
Identify the longest side and check the combined package size.
Open calculatorKeep facts, estimates and limits separate.
A package plan becomes trustworthy when you can see what came from your scale, what came from geometry, and what came from a carrier rule.
Learn the three weights- 01Measured input
Finished outer dimensions and actual scale weight.
- 02Published rule
Service, market, divisor, thresholds and rounding order.
- 03Planning estimate
Visible formula, comparison and the next useful check.
- 04Carrier verification
Final rate, acceptance and account terms remain official.
Guides built around the question you need to answer.
Worked examples connect the calculators to measurement, right-sizing, pallet and volume workflows.
Browse all guides →Actual vs dimensional vs billable weight
Separate scale weight, volume-based weight and the value used for a shipping-price calculation.
Read guide →02How to choose a shipping box
A practical sequence for balancing fit, protection, dimensional weight and handling thresholds.
Read guide →03How to reduce dimensional weight responsibly
Find packaging reductions that do not trade away product protection.
Read guide →04How many boxes fit on a pallet?
Calculate cartons per layer, then limit layers by height and gross weight.
Read guide →05How to calculate CBM for multiple cartons
Add shipment volume across one repeated carton type without premature rounding.
Read guide →