Methodology

Calculators use standard formulas: loan payments use the amortized-payment formula, compound interest and SIP use periodic compounding, and health calculators use the Mifflin-St Jeor (BMR), Devine (ideal weight) and US Navy (body fat) equations.

State sales tax rates, effective property tax rates and median home prices on location pages are approximate state-level estimates used as default values. For cities with their own data, combined sales tax rates come from Galvix (October 2026) and typical home values from the Zillow Home Value Index via SmartAsset (February 2026). Local taxes, fees and insurance are not included. Always confirm figures with your state or local revenue department.

Results are estimates for information only and are not financial, tax, legal or medical advice.