🧪 Methodology

Calculator methodology and verification

Last updated: July 12, 2026 · Applies to: calculatorcove.com

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What “verified” means here: the implementation and arithmetic have been checked against the cited source and tested with documented inputs. It does not mean a physician, lawyer, accountant, engineer or other licensed professional has approved the result unless a named reviewer is shown on that page.

Our verification workflow

Define the user question. We document the exact output, units, jurisdiction and date sensitivity.
Prefer primary sources. Government agencies, standards bodies, legislation, academic publications and official product documentation take priority over secondary summaries.
Document the formula. Every retained calculator states its equation, variables, rounding rules and assumptions.
Test independently. We test ordinary inputs, boundary values, zero/negative handling, unit conversions and at least one hand-calculated expected result.
Review changes. A changed formula, source, rate or regulation requires a new test and a truthful last-reviewed date.

Evidence levels

Label	Meaning
Formula tested	Code output matches documented independent calculations.
Source checked	The cited primary source supports the formula or constant.
Expert reviewed	A named qualified reviewer has checked the page; credentials and date are displayed.
Estimate	Real results vary; assumptions and limitations are stated.

High-stakes subjects

Health, legal and financial tools are held to a higher bar. They remain available as educational utilities, but citations and disclaimers alone do not establish professional expertise. Users should verify consequential decisions with a licensed professional.

Corrections and testing

Report a suspected error through the contact page. Include the calculator URL, inputs, expected output and supporting source. Confirmed calculation errors receive priority correction and are recorded under our corrections policy.