Atmospheres to Psi (atm to psi)

Formula

1 atm = 14.6959 psi

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

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 atm = 73.4797 psi
• 12.5 atm = 183.699 psi
• 100 atm = 1469.59 psi

Atmospheres to psi conversion table

FAQ

How many psi are in one atmosphere?

1 atm = 14.6959 psi. 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 atmospheres to psi?

Multiply the value in atmospheres by 14.69594878: psi = atmospheres × 14.69594878. For example, 5 atm = 73.4797 psi.

How do I convert psi back to atmospheres?

Multiply by the inverse factor 0.06804596391 (atmospheres = psi × 0.06804596391), or use the psi-to-atmospheres page.

Related conversions

• Psi to atmospheres (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=atm&to_unit=psi
• MCP: server https://tttkmbb.com/mcp, tool convert_units with {"value":5,"from_unit":"atm","to_unit":"psi"}
• Markdown: https://tttkmbb.com/conversion/atm-to-psi.md · JSON: https://tttkmbb.com/conversion/atm-to-psi.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)