StowHand
Freight calculators that show every step of the math, not just a final number.
StowHand is a set of free calculators for freight math most tools hide: pallets per container with double-stacking, dimensional weight, freight class under the post-2025 NMFC scale, axle weights against EU and US federal bridge-formula limits, and a Spain-specific DeCA control-document checker (the paper version expires October 5, 2026). Every calculator prints the full arithmetic and names the rule it applied, including exceptions that usually trip people up, like a container's internal height being taller than its actual door. It's written by someone who works around pallets and loading bays, not a content agency.
What holds up
- +Shows every step of the arithmetic and names the rule applied, not just an answer
- +Flags rule exceptions that commonly trip people up, like door height versus container height
- +Covers a specific, dated regulatory change (Spain's DeCA document goes digital October 5, 2026)
- +Entirely free, no account needed to use a calculator
Mind the limits
- −Some tools are narrowly geographic — the DeCA checker only applies to cabotage rules in Spain
- −Built by one person around his own freight niche — coverage may miss cases outside pallets and trucking
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