Homeowner tools
Radon calculators that explain the next step.
Use practical tools without confusing federal guidance, state programs, and modeled cost estimates. Nothing here automatically sends your information to a contractor.
Result guidance
Check a radon result
Compare an air-test result with EPA’s published action guidance.
General education only. This does not certify a test or diagnose individual health risk.
Unit converter
Convert pCi/L and Bq/m³
EPA commonly uses 1 pCi/L = 37 Bq/m³ for homeowner guidance.
State resources
Find radon test-kit information
Free and discounted programs can change. Choose a launch state, then confirm inventory, eligibility, price, and dates with its official program.
Existing verified engine
Estimate a mitigation planning range
The same RadonCostGuide estimator is used here and on the dedicated cost-estimator page. Your radon reading does not directly raise the modeled price.
Your range will appear here
Complete the property questions to see a transparent modeled range and the factors behind it.
Use estimates carefully
Planning information is not a contractor quote.
Actual work can change with foundation conditions, access, routing, electrical work, permits, and local availability. Compare written scopes and independently confirm credentials and service coverage.