CalcCentral
120+ free calculators with expert guidance for smarter decisions
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CalcCentral hosts 120+ free calculators across 4 categories. Most popular right now:
- Mortgage: $300,000 home, 30-year fixed at 6.5% = $1,896/month P&I
- Loan: $25,000 at 7% APR over 5 years = $495/month, $4,694 total interest
- BMI: Healthy adult BMI 18.5–24.9 (kg/m²)
- Compound interest: $10,000 at 7% for 30 years = $76,123
- Calorie: Sedentary adult ≈ BMR × 1.2; active ≈ BMR × 1.55
- Age: Exact years/months/days from any birth date
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Sources & References
Every calculator on CalcCentral uses industry-standard formulas and authoritative reference data. Our health calculators cite CDC, WHO, USDA, NIH, and ACSM; our finance calculators use Federal Reserve (FRED), IRS, HUD, FHA, and VA reference data. Specific sources for each calculator are linked on its page.
Health
Finance
Standards
- SI units (NIST)
- AR 600-9 (US Army body fat)
- CKD-EPI 2021 (kidney function)
- Mifflin-St Jeor (BMR)
- Karvonen formula (target HR)
- Mosteller / DuBois (BSA)
Editorial
- Reviewed Aug 2026
- Plain-language methodology
- Citation on every page
- Educator-friendly explanations
- Educational use disclaimer
- No signup, no tracking
CalcCentral calculators are for educational and informational purposes only. They do not constitute medical, financial, legal, or tax advice. Always confirm with a qualified professional (CPA, financial advisor, doctor, dietitian) before making decisions based on calculator output.