What is foot?
A foot is a unit of length in imperial and US customary systems equal to 12 inches. It is commonly used in construction, architecture, body height measurements, and aviation for altitude references.
Real-world uses
Feet are the primary unit for building dimensions, room sizes, and ceiling heights in the United States. Aviation uses feet for altitude worldwide (e.g., cruising at 35,000 ft). Human height in the US and UK is commonly expressed in feet and inches.
History
The foot has been used since ancient civilizations, with varying lengths based on the local king's foot. The modern international foot was defined in 1959 as exactly 0.3048 metres, replacing slightly different US and British survey definitions.
Common mistakes
Using an apostrophe for feet (6') and confusing it with the prime symbol. Also, people often round 1 foot to 30 cm instead of the correct 30.48 cm, leading to cumulative errors in construction.
What is centimetre?
A centimetre is a metric unit of length equal to one hundredth of a metre. It is commonly used for everyday measurements such as clothing sizes, body height, and small object dimensions.
Real-world uses
Centimetres are widely used in clothing measurements, body height in medical records (outside the US), screen sizes in some markets, and school rulers. Tailors and dressmakers rely on centimetre tape measures for precise garment fitting.
History
The centimetre was established as part of the original metric system in the 1790s. It served as the base length unit in the now-superseded CGS (centimetre-gram-second) system used extensively in physics until the mid-20th century.
Common mistakes
Forgetting that there are 2.54 cm in one inch, not 2.5. Also, confusing cm² (area) with cm (length) when specifying material dimensions.
When is this conversion used?
Converting between foot and centimetre is common when working across metric and imperial systems, such as international trade, travel between countries with different measurement standards, or following instructions from a different region. This conversion is frequently needed in construction, architecture, and real estate where building codes may specify dimensions in one system while materials are sold in another. Screen sizes, paper dimensions, and clothing measurements often require converting between centimetres and inches, especially when shopping internationally.
Worked examples
1 foot = 30.48 centimetre
1 centimetre = 0.01 metre
How to convert foot to centimetre
To convert foot to centimetre, multiply the value by 30.48.
To convert centimetre back to foot, multiply by 0.0328084.
Measurement standards
The metre is one of seven SI base units, maintained by the International Bureau of Weights and Measures (BIPM). Since 2019, it is defined by fixing the numerical value of the speed of light in vacuum to exactly 299,792,458 metres per second.
Did you know?
A human hair is roughly 70 micrometres wide, while a single gold atom measures about 0.144 nanometres in diameter — meaning you could line up nearly half a million atoms across the width of one hair.
Quick reference: foot to centimetre
| foot | centimetre |
|---|---|
| 0.1 | 3.048 |
| 0.5 | 15.24 |
| 1 | 30.48 |
| 2 | 60.96 |
| 5 | 152.4 |
| 10 | 304.8 |
| 25 | 762 |
| 50 | 1,524 |
| 100 | 3,048 |
| 250 | 7,620 |
| 500 | 15,240 |
| 1,000 | 30,480 |
Common values
| foot | centimetre | |
|---|---|---|
| Height of a door | 6.88976378 foot | 210 centimetre |
| Basketball court length | 91.86351706 foot | 2,800 centimetre |
| Football field (soccer) | 344.48818898 foot | 10,500 centimetre |
| Marathon distance | 138,435.03937008 foot | 4,219,500 centimetre |
| Altitude of a cruising airplane | 35,000 foot | 1,066,800 centimetre |