This page explains how Wolveyes calculators work, where their figures come from, and what their results do and do not cover.
Where the figures come from
Each calculator page shows its formula and a worked example, so you can see exactly how a result is reached. Reference figures used by a calculator, such as material densities or coverage rates, are stated on that page. Where a calculator shows a price, the page states the basis and the date of that figure. Material prices vary by supplier and region, so check local prices before ordering.
Units and rounding
Calculators work in Imperial and metric units, and the unit toggle converts your inputs between the two. Results are rounded for readability, and quantities you buy are rounded up to whole units, since part of a bag, board or pack cannot be bought.
Waste and allowances
Many material calculators add a waste allowance, often 10 percent by default, to cover cutting, breakage and pattern matching. The allowance is shown on the page and can be changed to suit your project.
How calculators are checked
Each calculator is checked against worked examples before it is published, and re-checked when its page changes. If a figure on a page is wrong, it is corrected and the page date is updated.
What a result is not
A calculator result is an estimate for planning and ordering. It is not a quote and not professional advice. Structural, electrical and gas work should be done by a qualified professional.
Updates
Every page shows the date it was last updated. Figures are reviewed when standards or reference prices change.