PackCalc ships calculators only after the math matches the published standards, lab data, and edge-case fixtures we lean on every day. This Methods reference collects:
- Equations and constants sourced from ASTM, ISTA, EN, ISO, and EUMOS references, annotated with page and clause numbers.
- Worked examples that mirror real PackCalc tool inputs so you can cross-check results without reverse engineering the UI.
- Verification notes explaining how we validate Three.js visuals against deterministic geometry, or how our Supabase usage counters line up with API payloads.
Need something specific?
- Box & case math → McKee safety factors, humidity/time derating, DIM weight rounding logic.
- Pallet fit planner → Layer families, overhang handling, and arrangement scoring.
- Environmental tools → Psychrometric equations, Q10 assumptions, and EPA equivalencies.
We keep this page versioned alongside the codebase. If a calculator changes, the derivation or constant set lands here the same day. Have a method you want documented? Send us a note and we’ll add it.