Free Tools
Free Confined Space Calculators and Tools
Decide whether a space is permit-required, check gas monitor readings against common limits, and estimate ventilation purge time. Everything runs in your browser.
- 3 free tools
- No sign-up
Calculator
Is It a Permit-Required Confined Space? Interactive Decision Tool
Answer yes/no questions to classify a space: not confined, non-permit, permit-required, alternate procedures or reclassification.
CalculatorConfined Space Gas Reading Checker: Are Your 4-Gas Readings Acceptable?
Compare O2, %LEL, H2S and CO readings with OSHA limits, alarm setpoints and IDLH values.
CalculatorConfined Space Ventilation Calculator: How Long to Purge Before Entry
Estimate purge time and air changes per hour from space size, blower CFM and duct losses.
Free mini-trainings
Learn it step by step
Short lessons with a graded quiz at the end of each one.
Need Documented Confined Space Training?
Awareness, Entry, Supervisor and Competent Person courses aligned with OSHA. Certificate of completion. English & Spanish.