Calculator Methodology & References
Decivia provides transparent estimates for practical decisions. Every calculator states its method, assumptions, example, and limitations so the result can be checked rather than taken on trust.
How calculations are built
- Each tool starts with a defined question, input unit, output unit, and calculation boundary.
- Formula logic is kept in the shared client-side calculation library where it can be reused consistently.
- Pages show the governing formula or method, a worked example, and the assumptions that materially affect the result.
- Interactive outputs are paired with static explanatory content so the page remains understandable without entering data.
References and limitations
Reference values are identified on the relevant calculator page. Examples include NEC ampacity and conductor resistance tables, Darcy-Weisbach pressure loss, USGS water-hardness bands, geometric volume formulas, and standard financial annuity formulas.
Reference values may be simplified, illustrative, or typical rather than a complete design standard. Codes, manufacturer specifications, local conditions, material grades, tax rules, and safety requirements can change the correct decision.
Testing approach
Calculation functions are checked against independently recomputed examples and boundary conditions such as zero rates, unit conversion, maximum gaps, empty inputs, and values outside reference ranges. Worked examples are kept aligned with the live formulas.
Professional-use notice
Decivia calculators are general estimation and reference tools. They do not replace a licensed electrician, structural engineer, financial professional, contractor, code official, manufacturer instructions, or local law. Verify any safety-critical, regulated, contractual, or construction decision with the applicable authority.