Article — Foot to Centimeter Converter
Foot to Centimeter Converter: The Exact 30.48 Factor Explained
- What the foot to centimeter conversion is
- The exact foot to centimeter factor
- Convert feet and inches to centimeters
- Height chart from feet to centimeters
- International foot vs. US survey foot
- Mental math shortcuts for foot to cm
- Common foot to centimeter mistakes
- Where feet are still in everyday use
One international foot equals exactly 30.48 centimeters. The factor is a defined value from the 1959 International Yard and Pound Agreement, not a measurement, so it never changes and never rounds.
That single number is enough for nearly every conversion you will ever need. A five-foot-nine person stands 175.26 cm tall. A 40-foot shipping container is 1219.2 cm long. A standard residential ceiling at eight feet sits at 243.84 cm. The math is one multiplication, every time.
What the foot to centimeter conversion is
The foot to centimeter conversion takes a length in feet (a customary unit still used in the United States, the United Kingdom, Canada, and aviation worldwide) and expresses it in centimeters, the everyday metric unit. Because the metre is the SI base unit of length and the foot is defined in terms of the metre, the conversion is purely arithmetic.
Centimeters are the working unit for human height, clothing, furniture, and most household measurements outside the US. Knowing the conversion lets you read a passport, a piece of IKEA assembly, or a sports roster regardless of which system the source was using.
The exact foot to centimeter factor
The international foot is defined as exactly 0.3048 metres. Since one metre is 100 centimeters, one foot is exactly 30.48 centimeters. There is no measurement uncertainty in this number, only the number of digits you choose to write down.
This wasn’t always true. Before 1959, the United States, the United Kingdom, and the Commonwealth each maintained slightly different physical standards, with the foot varying by a few millionths of a metre between them. The 1959 agreement harmonized the imperial and US customary foot on a single SI-anchored definition. NIST has used the value 0.3048 m ever since.
The foot was redefined in 1959 to align with the metre. From that point on, the foot has been a metric unit in disguise — every reading on a US tape measure is, by definition, traceable to the BIPM platinum-iridium standard kept outside Paris.
Convert feet and inches to centimeters
Human height is usually written as feet and inches rather than decimal feet. Convert the inches portion separately: one inch is exactly 2.54 cm. So 5 ft 9 in becomes (5 × 12 + 9) × 2.54 = 69 × 2.54 = 175.26 cm.
If you only multiply the feet portion you will be short by up to 27 cm at 11 inches. That is a common mistake when transcribing height between US medical records and metric ones. Always count the inches.
ft → cm multiply by 30.48cm → ft divide by 30.48in → cm multiply by 2.54ft + in → cm (12·ft + in) × 2.54Height chart from feet to centimeters
Most everyday foot-to-centimeter conversions are heights. The world median adult male is about 171 cm, or 5 ft 7 in. The world median woman is around 159 cm, 5 ft 3 in. Dutch men, the tallest measured population, average 183 cm or 6 ft.
- 5 ft 0 in = 152.40 cm
- 5 ft 4 in = 162.56 cm (median US woman)
- 5 ft 8 in = 172.72 cm (median global man)
- 5 ft 9 in = 175.26 cm (median US man)
- 5 ft 10 in = 177.80 cm (median UK and German man)
- 6 ft 0 in = 182.88 cm (median Dutch man)
- 6 ft 2 in = 187.96 cm
- 6 ft 6 in = 198.12 cm (tall by clinical thresholds)
International foot vs. US survey foot
For roughly 60 years two definitions of the foot ran in parallel in the United States. The international foot, used for almost everything, was 0.3048 m exactly. The US survey foot, used in some state plane coordinate systems, was 0.3048006096 m — longer by about two parts per million. Over a 100-mile baseline that produced a 32-cm difference.
NIST and NOAA jointly retired the survey foot on 1 January 2023. For any modern conversion, foot means international foot, and the answer is 30.48 cm per foot exactly. The survey foot survives only in archival data.
Plats and deeds drawn before 2023 in states like California, Indiana, Michigan, or Oregon may use the US survey foot. For deeds and engineering drawings, always read which foot is meant before converting to centimeters.
Mental math shortcuts for foot to cm
For a fast estimate, multiply feet by 30 and add half a centimeter for every foot. Six feet is 6 × 30 = 180, plus 3 = 183 cm. The true value is 182.88, so the error is 0.07%. That is closer than most tape measures can read.
Going the other way, divide centimeters by 30 and subtract a few percent. A 200-cm doorway is roughly 200 ÷ 30 = 6.67 ft, or about 6 ft 8 in. The precise answer is 6 ft 6.74 in — close enough for clearance planning, not close enough for fitting a sofa through the gap.
When converting human height for medical or athletic records, work in inches first. Convert feet and inches to total inches, multiply by 2.54, and round to one decimal. That route avoids the rounding errors that creep in if you handle the feet and inches separately.
Common foot to centimeter mistakes
The first error is dropping the inches when converting a height. A patient listed as “5 ft 9” is 175.26 cm, not 152.4 cm. The gap is large enough to misclassify a person’s BMI by 4 points.
The second is rounding too early. If you round 5 ft 9 in to 5.75 ft and multiply by 30.48 you get 175.26 cm — the same answer, by coincidence, only because 9/12 = 0.75. For 5 ft 5 in, rounding 5.4 ft gives 164.59 cm, but the exact 65 in × 2.54 = 165.10 cm. Always convert mixed units to total inches before multiplying.
The third is confusing feet with feet plus tenths. “5.5 ft” means 5 ft 6 in (167.64 cm), not 5 ft 5 in (165.10 cm). Decimal feet are common in surveying; feet-inch notation dominates in everyday life. Read the units carefully.
Where feet are still in everyday use
Feet remain the working unit in US construction, road signage, real estate, and aviation altimetry worldwide. The United Kingdom uses feet alongside metric units, with road distances in miles and human height often given in feet and inches. In Canada and Australia, real estate listings frequently include both units; aviation always uses feet for altitude.
For science, manufacturing, and most international trade, centimeters and metres dominate. The foot-to-centimeter conversion bridges the gap. Whether you are reading a NBA roster or building a deck from a metric drawing, one number — 30.48 — does the work.