About Calculator200.com
Calculator200.com provides 300+ free online calculators for finance, health, math, and everyday use. Every calculator is built on standard financial mathematics and evidence-based formulas, and verified against primary sources such as the IRS, Federal Reserve, WHO, and CDC.
Our Mission
The financial and health tools that help people make better decisions should be free, accurate, and trustworthy — not locked behind paywalls or designed primarily to generate leads for financial products. Calculator200.com was built on that principle.
We believe that a person calculating their mortgage payment, checking their BMI, or estimating their retirement savings deserves quality information — with transparent methodology, authoritative sources, and appropriate professional caveats. That's what we build.
We earn revenue through Google AdSense display advertising. Our advertisers have no influence over our calculator formulas, data sources, or editorial content. We do not accept sponsored placements embedded in our calculators or content.
How We Build and Verify Our Calculators
- Formula research: Every calculator starts with primary source research — IRS publications for tax calculators, WHO/CDC guidelines for health calculators, Federal Reserve and CFPB data for financial calculators, and peer-reviewed research for health metrics.
- Formula development and testing: Calculators are built using standard financial mathematics and evidence-based health formulas. Outputs are cross-validated against known values and established tools before publication.
- Source citation: All statistics, rates, and guidelines referenced in content are sourced from authoritative primary sources and cited explicitly.
- Annual updates: Time-sensitive data including tax brackets, interest rates, contribution limits, and clinical guidelines are reviewed and updated at least annually or when significant changes occur.
- Corrections: When errors are identified — by our team or readers — they are corrected promptly per our Corrections Policy.
Our Primary Sources
- Internal Revenue Service (IRS)
- Federal Reserve
- Consumer Financial Protection Bureau (CFPB)
- Bureau of Labor Statistics (BLS)
- Freddie Mac / Fannie Mae
- National Association of Realtors (NAR)
- U.S. Dept. of Education (studentaid.gov)
- Social Security Administration (SSA)
- FDIC / SEC
- World Health Organization (WHO)
- Centers for Disease Control (CDC)
- National Institutes of Health (NIH)
- USDA Dietary Guidelines (MyPlate)
- Academy of Nutrition and Dietetics
- American Council on Exercise (ACE)
- American Journal of Clinical Nutrition
- US Navy Physical Readiness Program
- Peer-reviewed nutrition journals
AI Assistance Disclosure
Calculator200.com uses AI tools to assist in content drafting, formula documentation, and FAQ development. All AI-assisted content is reviewed by our editorial team and verified against authoritative primary sources before publication. Calculator formulas are independently tested. AI tools do not replace human editorial judgment or source verification.