Girth

Welcome to Girth – the high-performance, zero-permission physical freight and package optimization engine engineered specifically for e-commerce shippers, indie developers, and logistics operators who require accurate dimensional weight calculations and packing space optimizations entirely offline.

Girth packs four specialized physical logistics calculation engines onto a clean, single-viewport dashboard panel. Audit postal carrier dimension limits, convert dimensional weight billing triggers, solve master crate packing capacities, and estimate gross payload targets instantly without relying on active cellular networks or external logistics APIs.

🔒 100% OFFLINE & PRIVATE (ZERO PERMISSIONS)
Girth runs on a strict, local-first computing framework. The application deliberately excludes the Android Internet Permission (android.permission.INTERNET) from its manifest and requests zero hardware permissions. Your box dimensions, item weights, carrier limits, and cargo manifests are processed entirely within volatile device system memory and never leave your hardware.

📦 FOUR CORE FREIGHT LOGISTICS ENGINES

1. THE GIRTHOMETER: CARRIER LIMITS AUDITOR
Eliminate unexpected carrier surcharges before posting shipments. Input physical box dimensions (Length, Width, Height) to instantly calculate total length and girth formulas (e.g., L + 2W + 2H). The engine cross-references standard global postal and freight size thresholds to flag oversized or heavy-package penalties offline.

2. THE MASS: DIMENSIONAL DENSITY CONVERTER
Determine whether carriers bill you based on physical weight or volumetric spatial footprint. Input actual item weight and dimensional metrics along with customizable industry-standard volumetric divisors (such as 139 or 166). The engine isolates the exact billing trigger to help you right-size outer packaging.

3. THE NEST: STOWAGE & PACKING MATRIX
Optimize container volume and prevent box crushing. Input master crate interior dimensions alongside smaller item exterior measurements. The nested bin-packing algorithm calculates maximum physical unit capacity without breaching crate boundaries.

4. THE TARE: NET-TO-GROSS PAYLOAD ESTIMATOR
Calculate total shipping mass prior to scale weigh-ins. Combine individual item weights, protective packaging percentages (bubble wrap/foam margins), and outer carton shell weights to output accurate gross payload targets, preventing compliance penalties at freight terminals.

IMPORTANT NOTICE:
Girth is an industrial logistics reference utility. All calculations are digital estimations based strictly on user-supplied numeric values and standard volumetric formulas. These outputs do not constitute official shipping manifests or carrier weight guarantees. Shippers remain responsible for verifying carrier specifications prior to dispatch.

Recent changes:
• Initial Release: A secure, zero-permission freight and package optimization engine.
• Single-View Workspace: High-efficiency dashboard layout built with native Jetpack Compose.
• The Girthometer: Audit carrier dimension thresholds (L+2W+2H) to prevent size surcharges offline.
• The Mass & Tare: Calculate dimensional (DIM) weight billing triggers and net-to-gross payload weights.
• The Nest: Run nested 1D/2D bin-packing calculations to maximize master crate stowage capacities.