Fidamen

Convert Miles per Hour to Meters per Second - Speed Converter

This converter converts a speed value in miles per hour (mph) to metres per second (m/s) using the internationally agreed unit definitions. It is suitable for quick checks, engineering estimates, and unit-standardized reporting.

The conversion uses the exact international relationship between the mile and the metre, so the mathematical factor is exact. Practical accuracy depends on the precision of your input and the measurement uncertainty of any instrument used to obtain that input.

Guidance on rounding, significant figures, and calibration is provided below so you can choose an appropriate level of precision for driving, laboratory, and industrial contexts.

Updated Nov 6, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record a61faec36c46 • Reviewed by Fidamen Standards Committee

Interactive converter unavailable for this calculator.

We could not resolve compatible units for this experience. Please verify the slug follows the pattern `from-unit-to-unit-converter`.

Methodology

Underlying standard: the international yard and mile definitions and the SI metre are used as the authoritative basis for unit values. The tool applies the exact numeric relationship derived from those definitions.

Precision and reporting: for everyday use (legal speed, driving) two decimal places are usually sufficient; for engineering, fluid dynamics, or instrumentation use retain more significant figures and include measurement uncertainty per ISO and NIST guidance.

Calibration and compliance: if converting measured speeds for regulatory, safety, or contractual purposes, record instrument calibration traceable to an accredited laboratory following ISO/IEC 17025 and document uncertainty estimates according to NIST and ISO best practices.

Worked examples

Example 1: 60 mph → 60 × 0.44704 = 26.8224 m/s (commonly reported as 26.82 m/s).

Example 2: 5 mph → 5 × 0.44704 = 2.2352 m/s (commonly reported as 2.24 m/s).

F.A.Q.

Is the conversion factor exact or approximate?

The numeric factor 0.44704 derives from the exact international definition 1 mile = 1609.344 metres and 1 hour = 3600 seconds, so the factor itself is exact. Practical results are affected only by input precision and instrument uncertainty.

How many decimal places should I use?

For everyday speed reporting (road speeds) two decimal places are typically adequate. For engineering, physics, or instrumentation use retain more significant figures and include uncertainty estimates; consider 4–6 significant figures where required.

What about measurement uncertainty and calibration?

When converting measured speeds for compliance, safety, or contractual records, use calibrated instruments traceable to an accredited lab (ISO/IEC 17025). Report converted values with the original measurement uncertainty propagated to the new units per ISO and NIST guidance.

Can I convert back from m/s to mph?

Yes. To convert from metres per second to miles per hour divide by 0.44704 (equivalently multiply by 3600 / 1609.344 = 2.2369362920544...).

Are there regulatory standards that govern unit use?

Yes. Use the International System of Units (SI) as described by the BIPM and ISO for scientific and many regulatory contexts; national agencies and industry standards bodies provide additional guidance on reporting and traceability.

Sources & citations

Further resources

Versioning & Change Control

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

Record ID: a61faec36c46

What changed (latest)

v1.0.0 • 2025-11-06 • 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 6, 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 • 2025-11-06 • 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: e375ea0d831c