BuildGauge is a planning aid for DIYers and small contractors. It turns measured dimensions into transparent quantities; it does not replace project design, a supplier quote, or professional judgment.
Formula first
Every calculator begins with geometry, arithmetic, or a clearly described planning model. Area, volume, linear layout, package rounding, and budget adjustments are kept separate so users can see what changed the result.
Source hierarchy
We prefer current manufacturer technical literature for product claims, recognized trade guidance for installation context, government or university material for public guidance, and explicit mathematical derivation for geometry and conversions. Competitor calculators are not treated as authorities.
Defaults are labels, not facts
Room dimensions are examples. Coverage, density, package size, waste, settlement, finish multipliers, cost rates, and contingencies are editable planning defaults unless a named source supports the exact product value. Product-dependent fields should be checked against the selected label or supplier.
Units and rounding
Inputs are converted to a common base unit before calculation. US customary and metric outputs use exact conversion constants where available. Raw quantities remain unrounded; whole bags, rolls, sheets, cartons, and boards are rounded up only at the purchase boundary.
Safety and local requirements
A quantity estimate does not approve structural dimensions, code compliance, thermal assemblies, stair geometry, post embedment, roof design, or installation details. Current project documents, manufacturer instructions, local authorities, and qualified professionals take priority.
Editorial review
Calculator formulas, source scope, defaults, examples, warnings, and unit behavior are reviewed together. The current calculator review is dated November 2, 2026 and attributed to the BuildGauge Editorial Team. A review date means the cited material was checked—not that a product or code will remain unchanged.