Editorial and calculation methodology

Last updated: June 21, 2026

Every calculator uses published dimensional relationships and displays its core formula on the page. Metric values are the internal calculation baseline; imperial values are converted using fixed international conversion factors.

Purchasable items such as tiles, boxes and rolls are rounded up. Waste is applied before final rounding. Examples are manually reviewed, and formula changes require automated tests. Prices are entered by users and are never presented as live market prices.

These tools provide planning estimates, not engineering, structural, code-compliance or professional construction advice.