Fidamen

Convert Kilopascals to Millibar - Pressure Converter

This tool converts a pressure value expressed in kilopascals (kPa) to millibars (mbar). The mathematical relationship between these units is fixed and exact: 1 kPa equals 10 mbar.

The numeric conversion is exact, but when working with real instrument readings you must account for measurement uncertainty, calibration status, and environmental conditions. Guidance below references measurement and calibration standards used in laboratories and industry.

Updated Nov 17, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record fead5526288f • Reviewed by Fidamen Standards Committee

Interactive Converter

Convert between kilopascal and millibar with precision rounding.

Quick reference table

KilopascalMillibar
KPA 1.00 kPa10 mbar
KPA 5.00 kPa50 mbar
KPA 10.00 kPa100 mbar
KPA 25.00 kPa250 mbar
KPA 50.00 kPa500 mbar
KPA 100.00 kPa1,000 mbar

Methodology

The conversion uses the defined SI relationship between pascals, kilopascals, and the millibar. Millibar is a derived unit where 1 mbar = 100 pascals and 1 kPa = 1000 pascals, giving the exact factor 1 kPa = 10 mbar.

While the arithmetic conversion is exact, good practice for metrology and compliance is to document the originating instrument's accuracy, calibration traceability, and the number of significant digits reported. For calibration and lab traceability follow ISO 17025 and NIST-traceable procedures.

Key takeaways

Multiply kPa by 10 to get mbar; the arithmetic is exact. For instrument-derived values, always document calibration traceability and measurement uncertainty per ISO 17025 and NIST guidance.

Use appropriate precision when reporting converted values and follow applicable safety and regulatory guidance for any operational or legal use of pressure data.

Worked examples

Example 1: 1.2 kPa → 1.2 × 10 = 12.0 mbar.

Example 2: 101.325 kPa → 101.325 × 10 = 1013.25 mbar (standard atmospheric pressure rounded to typical sensor precision).

F.A.Q.

Is the conversion factor approximate or exact?

The conversion factor between kilopascals and millibars is exact: 1 kPa = 10 mbar. Any rounding error comes from numeric formatting, not the conversion itself.

Why do converted results sometimes include uncertainty?

Converted values inherit uncertainty from the measured input. Instrument accuracy, calibration uncertainty, and environmental conditions determine the meaningful number of significant digits. The conversion does not remove measurement uncertainty.

What standards should I follow for calibration and reporting?

For calibration laboratories and traceability use ISO 17025. For SI unit definitions and best practice consult NIST guidance. In safety-critical or regulated environments, follow applicable industry and OSHA guidance for pressure systems.

How many decimal places should I display?

Display precision based on the input measurement's uncertainty. Do not imply greater accuracy than the instrument provides; for example, if the sensor accuracy is ±0.1 kPa, reporting beyond one decimal in kPa or beyond one decimal in the converted mbar value may be misleading.

Does temperature or altitude affect the conversion?

The mathematical conversion between units is independent of temperature and altitude. However, instrument readings can be affected by environmental conditions; compensate or calibrate sensors as required for accurate measurement.

Is this conversion suitable for safety calculations?

You may use the numeric conversion in safety calculations, but always combine it with documented instrument uncertainty, calibration records, and applicable safety standards. For legal or regulatory compliance, rely on certified measurements and traceable calibration.

Sources & citations

Further resources

Versioning & Change Control

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

Record ID: fead5526288f

What changed (latest)

v1.0.0 • 2025-11-17 • 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 17, 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 • 2025-11-17 • 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: 6543393295ce