Publish one clear question at a time.
Calculators are selected because they answer a specific practical question with transparent inputs. NumLuma favors useful coverage over page count: a new page should add a distinct intent, calculation, scenario or explanation rather than repeat an existing page with minor wording changes.
Prefer primary standards and official references.
When a calculation depends on a defined measurement system or when an external reference materially improves context, NumLuma prefers primary or official sources. For example, SI-related conversion references point to the Bureau International des Poids et Mesures, while selected US consumer-finance context may point to the Consumer Financial Protection Bureau or Investor.gov.
Universal arithmetic formulas do not need a citation to make the math valid, but the formula itself should be visible so a reader can independently check it.
Separate engineering verification from expert review.
“NL Verified” means the calculator has visible math, runtime checks, edge-case coverage and local browser calculation. It does not mean a lawyer, accountant, lender, engineer or other external professional has reviewed the result unless NumLuma explicitly says so.
This distinction matters: software testing can verify arithmetic behavior, but it cannot turn a general calculator into location-specific professional advice.
State what the number does not include.
Money, work, business and home-project calculations can depend on taxes, fees, regulations, product specifications, local codes or real-world measurements. Calculator pages should name those boundaries rather than hide them behind a single result.
Correct the record instead of defending it.
If a published formula, label, assumption, example or reference is materially wrong, NumLuma should correct the page and add a public correction when the change is important enough to affect how readers interpret the result.