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Feet to Inches Calculator

Use this feet-to-inches calculator to normalize height, room, product, and plan measurements into total inches.

Live calculator

Feet to inches

Total inches68 in

5 ft plus 8 extra inches.

Decimal feet5.6667 ft

Total inches divided by 12.

Metric equivalent172.72 cm

1.7272 meters.

Formula

Feet to inches formula

Total inches = feet x 12 + extra inches

Use the extra inches field for mixed measurements such as 5 ft 8 in.

How to use

Steps

  1. Enter the whole feet.
  2. Add any extra inches if the measurement is mixed.
  3. Read total inches, decimal feet, and metric equivalents.

Example

Sample calculation

Input5 ft 8 in
Total inches68 in
Centimeters172.72 cm

Calculator use

Best for

  • Quick everyday math with the result and formula in one place.
  • Shopping, date, time, unit, school, or household comparisons.

Before relying on it

Check first

  • Use the extra inches field for mixed measurements such as 5 ft 8 in.
  • Mixing units, dates, or original values across the same calculation.
  • Rounding early and then using the rounded number in another step.

Details

What to know before using the result

Mixed measurementsFeet plus inches

The extra inches field avoids having to convert the mixed part manually.

Decimal feetTotal inches / 12

Useful when drawings or calculators expect feet as a decimal.

Metric checkCentimeters and meters

Helpful when the next tool or product spec uses metric length.

Source notes

References used for this calculator

NIST SI GuideLists conversion factors for inch and foot length units.

Benchmarks

How to read the result

1 ft: 12 in.

The core conversion.

5 ft 8 in: 68 in.

Common mixed-height example.

12 in: 1 ft.

Reverse check.

Calculator accuracy

Methodology and assumptions

Formula, inputs, limitations and review record
Formula

Total inches = feet x 12 + extra inches

Inputs used

Feet, Extra inches

Limitations

Everyday results are quick planning checks. Unit choices, rounding, labels, measurements, local prices, and real-world constraints can change the final decision.

Review record

Catalog QA baseline on June 6, 2026. This date marks the catalog-wide automated and editorial QA baseline, not a tool-specific expert review.

Cite this page

Toolkit Shelf. Feet to Inches Calculator. https://toolkitshelf.com/tools/feet-to-inches-calculator

FAQ

Common questions

How do I convert feet to inches?

Multiply feet by 12, then add any extra inches. The converter applies that relationship to every value you enter.

Can I enter a mixed height like 5 ft 8 in?

Yes. Enter 5 in the feet field and 8 in the extra inches field.

Why show decimal feet too?

Decimal feet are useful when another calculator, drawing, or quote asks for feet without a separate inches field.