HomeCalculatorsPhysicsUnitsPSI to Bar Converter
Physics calculator

PSI to Bar Converter

Convert between pound-force per square inch and bar. Runs locally in your browser.

Instant result
Result
—

Enter values to calculate.

Inputs—
Mode—
Formula—
Trust summary CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance
Input interpretation
Enter values to calculate.
Result
—
Assurance
Engineering
Declared partition coverage
PASS · 2/2 declared partitions (psi-bar, invalid-domain) · Matrix
Known limitations
  • Pressure unit conversion
  • Core CVP does not include live graph, viewport, or pointer interaction.
Model
PSI ↔ bar conversion.
Scope
Positive pressure magnitudes
Verification
Engine tested · Source checked · v1.0.2 · CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance· View Manifest · CVP overview · Specification
Versions
Calculation 1.0.2 · CVP protocol 1.0.0-proposed · Evidence 2026-11-09.uuce-canonical-units-v1
Verification revision
2026-11-09.uuce-canonical-units-v1 · 1/1 property · digest 536fe15c1cd8
Legacy regression
4/4 tests · Production surface contract 6/6
Trust layers
Verification VERIFIED · Production CURRENT · Overall CVP state: VERIFIED under CVP 1.0.0-proposed
Reference
O1 model · O2 expected_values · O2 numerical_behavior
Interfaces
PASS · UI (SSR) / REST / MCP — ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 4/4 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only.
Supplemental domain review
Internal · Pass · CalculatorX electrical review
Named expert review
Not performed
CVP suite
5/5 golden · 3/3 CVP boundary · 8/8 invalid · 1/1 property · 2/2 metamorphic · 1/1 round-trip · 8/8 cross-interface · 6/6 CVP contract · Manifest
Sources
  • SI / customary pressure factors — bar and psi
  • NIST SP 811 / pressure units — bar and psi
Sources
Evidence
2 legacy golden · 1 legacy boundary · legacy regression suite · 5/5 oracle-backed golden · 8/8 invalid · Artifact integrity PASS · CalculatorX electrical review
This calculator CURRENT · Public schema 1.0.2 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓
Semantic contract
PASS
Full verification

Manifest identity, reference classes, interfaces, suite, and production records.

Formulas

Core equations used by this calculator.

psi → barbar = psi × (8896443230521 / 129032000000000)
bar → psipsi = bar × (129032000000000 / 8896443230521)
iExactly 1 bar = 100000 Pa and 1 psi = (8896443230521 / 1290320000) Pa. The runtime evaluates the conversion in binary64.

How to use

1

Choose psi → bar or bar → psi

Pick the conversion direction.

2

Enter the pressure value

Value must be finite and greater than zero.

3

Read the converted pressure

bar = psi × (8896443230521 / 129032000000000).

Example calculations

Common configurations with formula and result.

ϟ

14.503773773020923 psi

Approximately 1 bar

psi × (8896443230521 / 129032000000000)
1 bar

PSI to Bar converter specification

Version 1.0.2 · Engine tested · Supplemental domain review · Internal · 2026-08-09

Calculation status

Review policy · Evidence · Reviewed by CalculatorX electrical review

Definition
1 bar ≈ 14.503773773020923 psi. Modes convert psi→bar or bar→psi. Pressure must be positive.
What it calculates
PSI ↔ bar conversion.
Inputs
  • mode psi-bar|bar-psi
  • value
Outputs
  • bar or psi number
Formula
bar = psi × (8896443230521 / 129032000000000)
Assumptions
  • Positive pressure magnitudes
Units
  • psi, bar
Boundary conditions
  • Finite JSON numbers and bounded decimal strings are accepted. Nondecimal strings are rejected.
  • Nonzero results outside the binary64 range are rejected.
  • value≤0 → VALUE_MUST_BE_POSITIVE
Example
14.503773773020923 psi → 1 bar
Validation cases

1 published on this page · 4/4 tests · Production surface contract 6/6 · View evidence

  • psi-bar value=14.503773773020923 → 1
Sources
  • SI / customary pressure factors — bar and psi
    Supports: Pressure-unit conventions used to derive the exact ratio
  • NIST SP 811 / pressure units — bar and psi
    Supports: Pressure-unit conventions used to derive the exact ratio
Last reviewed
2026-08-09
Reviewed by
CalculatorX electrical review
Calculation version
1.0.2

Background

Interpretation and common distinctions.

Convert PSI ↔ bar.

Supported and not supported

Supported — Bidirectional psi↔bar · API units.pressure.psi_bar

Not supported — atm, torr, gauge→absolute

Agent / API notes

Capability id: units.pressure.psi_bar · tool id: psi-bar · pin 1.0.2.

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Frequently asked questions

Key distinctions behind the calculation.

Gauge or absolute?

This tool converts unit magnitude only — it does not add atmospheric offset.