Contact National Calculator Authority

National Calculator Authority is part of Authority Network America, an automated reference network. The calculators published on this site and across the ANA network are maintained programmatically — there is no staffed office or dedicated support line.

Reporting errors

If you identify a calculation error, outdated formula, or factual inaccuracy in any calculator published on this site, send an email to eli.rosales@authoritynetworkamerica.com with the specific page URL, a description of the error, and a reference to the correct standard or formula. Corrections that cite a named public source (such as an IRS publication, building code section, or professional standard) are prioritized.

About this site

National Calculator Authority indexes interactive calculators across 21 professional verticals. All tools run entirely in the browser — no data is collected, no account is required, and all computation logic is visible in the page source. The site is part of Authority Network America, which operates over 1,300 reference sites across the United States.

Calculator outputs are estimates based on published formulas and industry-standard methodologies. They do not constitute professional advice. Consult a licensed professional for decisions involving legal, financial, medical, or engineering matters.

Service area

The reference content on this site covers all 50 US states, the District of Columbia, and US territories where applicable federal standards apply. Calculators that reference state-specific rules (such as state income tax rates or jurisdiction-specific licensing thresholds) identify the applicable jurisdiction in the tool interface.