Convert Inch to Foot
Convert inches to feet instantly. 1 inch = 0.0833333333 foot — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Foot to Inch converter for the reverse conversion.
Units explained
Inch
An inch is an Imperial and US customary unit of length defined since 1959 as exactly 25.4 millimeters (0.0254 meters). It is still the standard small unit of length in the United States, the United Kingdom (informally), and a few other countries.
The inch derives from the Roman uncia (one-twelfth of a foot) and survived through Anglo-Saxon and medieval English measurement systems. Various definitions persisted regionally until the 1959 International Yard and Pound Agreement standardized the inch globally as exactly 25.4 mm.
Inches are used in the US and UK for body height, screen sizes (TVs, monitors, phones), tire sizes, plumbing, lumber, paper sizes (US Letter is 8.5 × 11 in), and most consumer product specifications in the United States.
Anglo-Saxon origin (predating 1066); standardized to 25.4 mm exactly by the International Yard and Pound Agreement of 1959, signed by the US, UK, Canada, Australia, New Zealand, and South Africa.
Foot
A foot is an Imperial and US customary unit of length equal to 12 inches or exactly 0.3048 meters. It is the most commonly used unit of length in everyday measurement in the United States.
The foot's origin is literally the length of a human foot, used as a measurement standard since antiquity. The English foot was standardized at various points in history; the modern international foot (0.3048 m exactly) was fixed by the 1959 International Yard and Pound Agreement.
Feet are used in the US for body height, building dimensions, room sizes, road sign clearances, aviation altitude (feet above sea level), and most everyday distance estimation. The UK uses feet informally for height despite officially being metric.
Used since antiquity; standardized to 0.3048 m exactly by the International Yard and Pound Agreement of 1959. Aviation worldwide uses feet for altitude despite metric adoption elsewhere.
Inch to Foot conversion formula
The relationship between inches and feet:
To convert inches to feet, multiply the value in inches by 0.0833333333. To reverse, multiply feet by 12.
How to use this converter
Type a value into the calculator. The result in feet updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Foot to Inch converter for the reverse direction.
Step-by-step: convert inches to feet
- Write down the value in inches (in).
- Multiply that value by the factor 0.0833333333.
- The product is the equivalent value in feet (ft).
- To reverse, multiply the foot value by 12.
Worked examples
Example 1 — Convert 1 in to ft:
1 × 0.0833333333 = 0.0833333333 ft
Example 2 — Convert 100 in to ft:
100 × 0.0833333333 = 8.3333333333 ft
Real-world example — One-yard reference
A 36-inch length is exactly 3 feet (1 yard). The conversion is what every American school child eventually internalises: 12 inches in a foot, 3 feet in a yard.
36 in × 0.0833333333 = 3 ft
Real-world example — Standard doorway height
An 84-inch doorway equals 7 feet — the standard interior door height in most American homes. Carpenters convert inches to feet whenever they read an architect's blueprint that mixes both units.
84 in × 0.0833333333 = 7 ft
Real-world example — Standard sofa or door height
A 72-inch sofa is exactly 6 feet long. American furniture buyers convert inches to feet whenever they need to mentally visualise whether a piece fits along a wall measured in feet on a floor plan.
72 in × 0.0833333333 = 6 ft
Inch to Foot conversion table
Standard reference values for converting inches to feet:
| Inch [in] | Foot [ft] |
|---|---|
| 0.01 | 0.0008333333 |
| 0.1 | 0.0083333333 |
| 1 | 0.0833333333 |
| 2 | 0.1666666667 |
| 3 | 0.25 |
| 4 | 0.3333333333 |
| 5 | 0.4166666667 |
| 10 | 0.8333333333 |
| 20 | 1.6666666667 |
| 30 | 2.5 |
| 40 | 3.3333333333 |
| 50 | 4.1666666667 |
| 100 | 8.3333333333 |
| 500 | 41.6666666667 |
| 1000 | 83.3333333333 |
Frequently asked questions
How many feet is 1 inch?
How do I convert inches to feet?
How do I convert feet back to inches?
How many feet is 100 inches?
Popular length unit conversions
Convert Inch to other length units
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Metric / SI (18 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 in = 0.0833333333 ft) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.