Psi to Atmospheres (psi to atm)

Formula

1 psi = 0.068046 atm

atmospheres = psi × 0.06804596391 — reverse: psi = atmospheres × 14.69594878

The factor is derived from the SI definitions of both units (base unit: Pa) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.

Worked examples

• 5 psi = 0.34023 atm
• 12.5 psi = 0.850575 atm
• 100 psi = 6.8046 atm

Psi to atmospheres conversion table

FAQ

How many atmospheres are in one psi?

1 psi = 0.068046 atm. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

What is the formula to convert psi to atmospheres?

Multiply the value in psi by 0.06804596391: atmospheres = psi × 0.06804596391. For example, 5 psi = 0.34023 atm.

How do I convert atmospheres back to psi?

Multiply by the inverse factor 14.69594878 (psi = atmospheres × 14.69594878), or use the atmospheres-to-psi page.

Related conversions

• Atmospheres to psi (reverse)
• Pressure Converter — all pressure units in one tool
• Psi to Bar
• Bar to Psi
• Psi to Kilopascals
• Kilopascals to Psi
• Bar to Kilopascals
• Kilopascals to Bar
• Atmospheres to Pascals
• Pascals to Atmospheres

Machine access

• API: GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=psi&to_unit=atm
• MCP: server https://tttkmbb.com/mcp, tool convert_units with {"value":5,"from_unit":"psi","to_unit":"atm"}
• Markdown: https://tttkmbb.com/conversion/psi-to-atm.md · JSON: https://tttkmbb.com/conversion/psi-to-atm.json (add ?value= for a result) · Units: /api/v1/units?quantity=pressure
• OpenAPI operationId: convert_units. Freshness: static. Authentication: none.

Sources

• NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors (standard)
• BIPM – The International System of Units (SI Brochure, 9th edition) (standard)
• Wikipedia – Conversion of units (reference)