Fidamen

Convert Feet to Inches - Length Converter

This converter turns a length in feet into the equivalent length in inches using the exact mathematical relationship between the two customary units. It is intended for everyday measurement, construction planning, and engineering checks where the conversion factor is fixed and exact.

Accuracy guidance and practical measurement advice are provided so you can choose appropriate rounding and understand measurement uncertainty. For formal compliance or legal metrology work, follow the referenced standards from national and international bodies.

Updated Nov 14, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record 347421aa0229 • Reviewed by Fidamen Standards Committee

Interactive converter unavailable for this calculator.

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Methodology

The tool uses the exact definition that 1 foot equals 12 inches and performs a deterministic multiplication of the input value in feet by 12 to produce inches. No empirical calibration is required for the arithmetic conversion itself.

For measurement accuracy and traceability, consult national metrology guidance (NIST), international unit standards (ISO), instrumentation and measurement best practices (IEEE), and workplace measurement safety rules (OSHA). Where measurements come from physical instruments, account for instrument tolerance and calibration status before reporting converted results.

Key takeaways

Use this tool to perform an exact arithmetic conversion from feet to inches with the fixed factor 1 ft = 12 in.

For practical measurement work, pair the conversion with instrument calibration and documented rounding rules following recognized standards.

Worked examples

5 ft → 5 × 12 = 60 in

6.25 ft → 6.25 × 12 = 75 in

5 ft 7 in → (5 × 12) + 7 = 67 in

F.A.Q.

What is the exact conversion factor from feet to inches?

The exact, defined conversion is 1 foot = 12 inches. This is an exact mathematical relationship used for all arithmetic conversions.

How should I round the result?

Round according to your required precision. For construction drawings you might round to the nearest 1/16 in or 1/8 in. For engineering calculations use at least the number of decimal places required by your tolerance specification. Always document the rounding rule used.

How do I convert a measurement given as feet and inches (for example 5'7")?

Convert the feet to inches and add the remaining inches: total_inches = (feet × 12) + leftover_inches. For 5'7", total_inches = (5 × 12) + 7 = 67 inches.

Are there accuracy or calibration concerns when using this converter?

The arithmetic conversion is exact. Accuracy concerns arise from the source measurement instrument (tape, ruler, laser). For traceable measurements follow calibration and uncertainty guidance from recognized standards bodies (see citations). Record instrument tolerance and calibration interval when required.

Can this converter handle very large or very small values?

Yes, the mathematical conversion scales linearly. For extremely large values check the host environment for numeric limits and rounding behavior. For typical use (construction, household, engineering) numeric range is not a practical concern.

Sources & citations

Further resources

Versioning & Change Control

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

Record ID: 347421aa0229

What changed (latest)

v1.0.0 • 2025-11-14 • 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 14, 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 • 2025-11-14 • 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: 27bc58095778