Useful answers, visible math

CalcLogicPro is an independent collection of focused calculators built and maintained by Richard Bell. Each tool is designed to answer one practical question with visible math instead of hiding the assumptions behind a result.

Who makes CalcLogicPro

Richard develops and reviews the site, including its formulas, unit conversions, validation rules, worked examples, and explanatory material. Calculation changes are maintained with their automated checks and revision history so an implementation and its explanation can be reviewed together.

Our approach

Each tool shows its assumptions, formula, intermediate values, and unit conversions. Inputs stay close to the result, pages work without client-side JavaScript, and related tools connect only when they help with the next step of a project.

What a calculator is—and is not

A calculator is a planning aid. It cannot inspect a site, read construction documents, account for every product specification, or replace advice from a qualified contractor, engineer, architect, or local building official.

Corrections

Formulas and assumptions are documented on the methodology page. If a published result needs correction, the formula, tests, worked example, and affected guidance are reviewed together. See contact and corrections to report a problem.