Pascals to Atmospheres (Pa to atm)

Formula

1 Pa = 0.00000986923 atm

atmospheres = pascals × 0.000009869232667 — reverse: pascals = atmospheres × 101325

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 Pa = 0.0000493462 atm
• 12.5 Pa = 0.000123365 atm
• 100 Pa = 0.000986923 atm

Pascals to atmospheres conversion table

FAQ

How many atmospheres are in one pascal?

1 Pa = 0.00000986923 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 pascals to atmospheres?

Multiply the value in pascals by 0.000009869232667: atmospheres = pascals × 0.000009869232667. For example, 5 Pa = 0.0000493462 atm.

How do I convert atmospheres back to pascals?

Multiply by the inverse factor 101325 (pascals = atmospheres × 101325), or use the atmospheres-to-pascals page.

Related conversions

• Atmospheres to pascals (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 Psi
• Psi to Atmospheres

Machine access

• API: GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=Pa&to_unit=atm
• MCP: server https://tttkmbb.com/mcp, tool convert_units with {"value":5,"from_unit":"Pa","to_unit":"atm"}
• Markdown: https://tttkmbb.com/conversion/pa-to-atm.md · JSON: https://tttkmbb.com/conversion/pa-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)