Visible formulas. Centralized rules. Reproducible results.
The assumptions behind a logistics calculation matter as much as the arithmetic.
Review status
LAST RULES REVIEW
August 13, 2026
Review dates are not guarantees. The current official service guide and account agreement control.
Core approach
One calculation engine per operational problem.
Unit conversion
Length converts through meters and weight uses the exact pound-to-kilogram constant.
Input validation
Negative and impossible values are rejected; decimals remain supported.
Pallet layout
Normal, rotated, and simple mixed strip arrangements are compared before height and weight limits.
Box fit
All six axis-aligned item orientations are tested without claiming irregular nesting.
Carrier configuration
Policy-sensitive values live in one typed file.
| Carrier | Rate / service | Divisor | Effective | Source |
|---|---|---|---|---|
| UPS | U.S. Daily Rates | 139 in³/lb | Current at 2026 review | Official source ↗ |
| UPS | U.S. Retail Rates | 166 in³/lb | Current at 2026 review | Official source ↗ |
| FedEx | U.S. domestic and international parcel | 139 in³/lb | 2026 service guide | Official source ↗ |
| USPS | Priority Mail Express, Priority Mail, Ground Advantage, Parcel Select | 139 in³/lb | 2026-07-12 | Official source ↗ |