Tool storage, worked out properly

Drawer slide ratings, sheet steel gauge, modular box footprints, truck bed geometry, foam layers, corrosion thresholds and lock grades. The specifications behind tool storage, taken apart properly, with the arithmetic shown.

The seven clusters

Storage is one subject with seven separate engineering problems inside it. Each hub covers its own completely.

Original data, built for this site

Specifications normalized across systems that each publish them differently, the cost analysis derived from them, and the vocabulary of the field defined precisely.

Start here

The guides that answer the questions people arrive with.

Calculators, not lead magnets

Every one runs entirely in your browser, keeps nothing, and prints the formula it used.

All calculators

Where every figure here comes from

Every number on this site traces to a published standard, a manufacturer specification, an institutional dataset or an arithmetic derivation shown on the page, and each guide says which. Specifications are normalized so systems that publish them differently can be compared directly, and where the analysis produces a figure the method is printed beside the result so you can check it. The source hierarchy is in how we analyze, and the rules are in editorial standards.