Fidamen

Convert Pascals to Bar - Pressure Converter

This converter transforms a pressure value in kilopascals (kPa) to bar using the fixed unit relationship between the SI-derived pascal and the bar. Typical uses include tyre pressure settings, HVAC specifications, laboratory work, and industrial instrumentation.

The conversion is based on internationally recognised unit definitions. Results are exact mathematically before rounding; users should consider instrument accuracy, measurement traceability, and required significant figures when applying converted values in safety-critical or regulatory contexts.

This tool includes practical notes on how the conversion is calculated, examples, and guidance on calibration and standards to help ensure results are used appropriately in engineering and compliance scenarios.

Updated Nov 24, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record cfe6ba156e86 • Reviewed by Fidamen Standards Committee

Interactive Converter

Convert between kilopascal and bar with precision rounding.

Quick reference table

KilopascalBar
KPA 1.00 kPaBAR 0.01 bar
KPA 5.00 kPaBAR 0.05 bar
KPA 10.00 kPaBAR 0.10 bar
KPA 25.00 kPaBAR 0.25 bar
KPA 50.00 kPaBAR 0.50 bar
KPA 100.00 kPaBAR 1.00 bar

Methodology

Pressure units are related by definition: 1 pascal (Pa) equals 1 newton per square metre. 1 kilopascal (kPa) equals 1,000 pascals. The bar is defined by convention as 100,000 pascals (1 bar = 100,000 Pa). Therefore the relationship between kilopascals and bar is exact: 1 bar = 100 kPa.

Conversions are purely arithmetic and do not change measurement uncertainty from the original instrument. When reporting converted values for engineering, regulatory, or legal purposes, retain or report the measurement uncertainty and traceability. Laboratories and calibration providers should follow ISO/IEC 17025 for traceable calibration and NIST guidance for SI usage.

Worked examples

100 kPa → 1 bar

101.325 kPa → 1.01325 bar (standard atmospheric pressure converted to bar)

50 kPa → 0.5 bar

F.A.Q.

Is the conversion between kPa and bar exact?

Yes. By definition 1 bar = 100,000 Pa and 1 kPa = 1,000 Pa, so 1 bar = 100 kPa. The mathematical conversion is exact; however, reported values should reflect instrument precision and measurement uncertainty.

How many decimal places should I show?

Match the number of significant digits to the precision of the measured value or the instrument specification. Do not imply greater accuracy by adding extra decimals beyond the measurement uncertainty.

Does converting units change measurement uncertainty?

No. Unit conversion is arithmetic and does not reduce or increase the underlying measurement uncertainty. Always carry forward uncertainty and calibration traceability when converting and reporting values.

What standards are relevant for using these converted values in professional contexts?

Relevant standards and guidance include NIST publications for SI unit usage, ISO standards for quantities and units, ISO/IEC 17025 for laboratory calibration and traceability, and applicable workplace safety regulations such as those from OSHA where pressure limits and device safety are enforced.

When should I calibrate pressure instruments?

Calibration intervals depend on instrument stability, usage, and criticality. Follow manufacturer guidance and accredited lab recommendations; for regulated or safety-critical systems, maintain traceability to national standards and document calibration per ISO/IEC 17025.

Sources & citations

Further resources

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: cfe6ba156e86

What changed (latest)

v1.0.0 • 2025-11-24 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.0.0

Data

Baseline (no external datasets)

Content

v1.0.0

UI

v1.0.0

Governance

Last updated: Nov 24, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

  • MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
  • MINOR: New features or fields that do not change existing outputs for the same inputs.
  • PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

  • Verify formulas and unit definitions against primary standards or datasets.
  • Run golden-case regression suite and edge-case suite.
  • Record reviewer sign-off with credentials and scope.
  • Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

  • Uses exact unit definitions from the Fidamen conversion library.
  • Internal calculations use double precision; display rounding follows the unit's configured decimal places.
  • Not a substitute for calibrated instruments in regulated contexts.
  • Jurisdiction-specific rules may require official guidance.

Change log

v1.0.0 • 2025-11-24 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 5c8ceac0a27a