Convert Foot to Cubit
Convert feet to cubits instantly. 1 foot = 0.6666666667 cubit — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Cubit to Foot converter for the reverse conversion.
Units explained
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.
Cubit
The UK cubit is an Imperial unit of length equal to 18 inches (457.2 mm). It represents the historical distance from the elbow to the tip of the middle finger.
Cubits derive from ancient body-measure traditions found in Mesopotamia, Egypt, and the eastern Mediterranean. The English customary cubit was standardised at 18 inches in medieval times.
UK cubits are rare in modern commerce but appear in historical English texts, biblical references, and historical reconstructions. Different cultures used cubits of different lengths.
Ancient origin; standardised at 18 inches in English customary practice; became exact via the 1959 International Yard and Pound Agreement.
Foot to Cubit conversion formula
The relationship between feet and cubits:
To convert feet to cubits, multiply the value in feet by 0.6666666667. To reverse, multiply cubits by 1.5.
How to use this converter
Type a value into the calculator. The result in cubits updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Cubit to Foot converter for the reverse direction.
Step-by-step: convert feet to cubits
- Write down the value in feet (ft).
- Multiply that value by the factor 0.6666666667.
- The product is the equivalent value in cubits (cubit).
- To reverse, multiply the cubit value by 1.5.
Worked examples
Example 1 — Convert 1 ft to cubit:
1 × 0.6666666667 = 0.6666666667 cubit
Example 2 — Convert 100 ft to cubit:
100 × 0.6666666667 = 66.6666666667 cubit
Real-world example — Maritime depth conversion
A 10-foot sounding depth converts cleanly into cubits. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 ft × 0.6666666667 = 6.6666666667 cubit
Real-world example — Reference scenario in case of fallback
Conversion between human-scale length units is the everyday workflow of architecture, athletics, and apparel design — three of the most common contexts that span metric and imperial systems.
1 ft × 0.6666666667 = 0.6666666667 cubit
Real-world example — Adult height conversion
A 1.8-foot-tall person measures a value in cubits that converts the height to the unit favoured by American forms, schools, or driver's licences. This is daily routine for anyone living between metric and imperial systems.
1.8 ft × 0.6666666667 = 1.2 cubit
Foot to Cubit conversion table
Standard reference values for converting feet to cubits:
| Foot [ft] | Cubit [cubit] |
|---|---|
| 0.01 | 0.0066666667 |
| 0.1 | 0.0666666667 |
| 1 | 0.6666666667 |
| 2 | 1.3333333333 |
| 3 | 2 |
| 4 | 2.6666666667 |
| 5 | 3.3333333333 |
| 10 | 6.6666666667 |
| 20 | 13.3333333333 |
| 30 | 20 |
| 40 | 26.6666666667 |
| 50 | 33.3333333333 |
| 100 | 66.6666666667 |
| 500 | 333.3333333333 |
| 1000 | 666.6666666667 |
Frequently asked questions
How many cubits is 1 foot?
How do I convert feet to cubits?
How do I convert cubits back to feet?
How many cubits is 100 feet?
Popular length unit conversions
Convert Foot to other length units
Show all Foot conversions
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 ft = 0.6666666667 cubit) 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.