Methodology

CalculatorShelf uses deterministic JavaScript formulas, documented calculation methods, visible assumptions, updated dates, server-rendered examples, and clear checkpoints for pages available as planning aids.

When a calculator is ready

A calculator should not enter the site map unless it has a working calculator, a specific formula, a numeric example, specific FAQs, unique metadata, related calculators, a clear page URL, a updated date, a risk-appropriate disclaimer, and sample calculations and live-page checks.

Calculation checks

Calculator math is exercised with shared-engine sample calculations and representative live-page checks. Parameterized share URLs should canonicalize to the base calculator URL.

Source policy

When a calculator depends on product labels, codes, safety guidance, market rates, or professional standards, the page must say what the calculator does and does not cover. Safety-sensitive pages remain conservative planning aids and point back to labels, codes, or qualified guidance.

Recent method changes

Recent changes tightened sitemap inclusion, consolidated CCTV storage into Surveillance Storage, clarified navigation labels, added visible contact information, and expanded assumption notes on safety-sensitive calculator pages.

Safety-sensitive policy

Pool chemistry, electrical, structural, pet emergency, medical, tax, legal, and serious finance topics require conservative language, source/methodology notes, and human review before publication.

How CalculatorShelf keeps pages useful

• Every finished calculator needs a working tool and a clear worked example.
• Pages need page-specific formulas, examples, mistakes, FAQs, and disclaimers.
• Safety-sensitive tools provide planning estimates only; compare results with current product labels, official guidance, or a qualified professional.
• No runtime AI is used to calculate results.