dotgovsource.com
Official government calculators, one page at a time.
Programmatic SEO for financial planning: 3,200 county-specific FHA calculators, flood data, per-diem allowances, and generous utility tools. All outputs cite .gov sources and update automatically.
Data refreshed December 13, 2025. Powered by HUD, FHFA, FEMA, and GSA downloads.
Other government datasets & tools
Each card below points to a robust calculator built on the latest federal downloads.
Per Diem
GSA-style lodging and meal rates derived from local FHA limits.
Visit Per DiemFlood Risk
FEMA National Risk Index summaries paired with every locality.
Visit Flood RiskInflation
Adjust historical dollars using official CPI-U data from BLS.
Visit InflationStudent Loans
Simulate monthly payments and interest on federal loans.
Visit Student LoansFuel Economy
Vehicle MPG and fuel cost planning (future FuelEconomy.gov import).
Visit Fuel EconomySolar Potential
Estimate savings using NREL PVWatts data for your city.
Visit Solar PotentialSafe Withdrawal
Use SSA/SEC tables to estimate sustainable retirement withdrawals.
Visit Safe WithdrawalHardiness Zones
USDA zone data to determine whether a plant can survive locally.
Visit Hardiness ZonesCoverage: 3,234 counties.