Feet to centimeters: the direct answer
To convert feet to centimeters, multiply the number of feet by 30.48. One international foot equals exactly 30.48 cm, so the formula is centimeters = feet × 30.48. For example, 6 ft × 30.48 = 182.88 cm. This relationship works for whole feet, fractional feet, and decimal feet. Keep the original measurement beside the converted value so another reader can check which quantity was entered.
Before using the formula for a person's height, establish how the source is written. A single value such as 5.5 ft means five and a half feet. A mixed value such as 5 ft 5 in has two parts and must be combined differently. Both can be converted accurately, but substituting one notation for the other changes the actual height. The distinction matters more than how many digits the calculator displays.
Convert feet and inches to cm
For a measurement with separate feet and inches, use centimeters = (feet × 12 + inches) × 2.54. Multiplying the feet by 12 changes them into inches; adding the remaining inches then produces a single length. Only after that addition should the total be multiplied by 2.54. An equivalent form is feet × 30.48 + inches × 2.54. The two methods are useful independent checks on the same result.
Consider 5 ft 8 in. First calculate 5 × 12 + 8 = 68 inches. Then 68 × 2.54 = 172.72 cm. Alternatively, 5 × 30.48 = 152.4 cm and 8 × 2.54 = 20.32 cm; their sum is 172.72 cm. This is a unit conversion of the stated height. It does not determine whether that height is appropriate for a medical, sporting, or administrative purpose.
Why 5.8 feet is not 5 feet 8 inches
The decimal part of a foot represents tenths or hundredths of a 12-inch unit. In 5.8 ft, the 0.8 ft portion equals 0.8 × 12 = 9.6 inches. Therefore, 5.8 ft is 5 ft 9.6 in and converts to 176.784 cm. A person recorded as 5 ft 8 in instead measures 172.72 cm. Confusing the two produces a difference of 4.064 cm even though the written numbers look similar.
To express mixed height as decimal feet, divide only the inches by 12 and add the whole feet. Thus 5 ft 8 in becomes 5 + 8/12 = 5.666666… ft. Keep that quotient unrounded until the centimeters are calculated. Entering 5.67 ft gives 172.8216 cm, which is slightly different because the input was rounded. When precision matters, convert the total 68 inches directly rather than introducing an intermediate rounded value.
Common height conversions
Useful exact examples are 5 ft = 152.4 cm; 5 ft 2 in = 157.48 cm; 5 ft 4 in = 162.56 cm; 5 ft 6 in = 167.64 cm; 5 ft 8 in = 172.72 cm; 5 ft 10 in = 177.8 cm; 6 ft = 182.88 cm; and 6 ft 2 in = 187.96 cm. Each additional inch changes the result by exactly 2.54 cm.
A height chart can be used in reverse as a quick reasonableness check. A measurement between 5 ft 8 in and 5 ft 10 in must lie between 172.72 and 177.8 cm. If your answer is 17.5 cm or 1,750 cm, the error probably concerns the decimal point or the unit label. These chart values describe exact conversions of the listed inputs, not the accuracy of a ruler or a person's reported height.
Decimal feet for rooms and equipment
Decimal feet are common in dimension lists and calculations because they behave like ordinary decimal numbers. A shelf length of 2.75 ft becomes 2.75 × 30.48 = 83.82 cm. A cable measuring 12.5 ft becomes 381 cm. For a room dimension recorded as 10 ft 6 in, convert 126 inches to obtain 320.04 cm. Converting every dimension separately helps avoid confusing a length conversion with an area calculation.
For a rectangular space, 10 ft by 12 ft becomes 304.8 cm by 365.76 cm. Its area requires multiplying the two converted lengths, so its unit is square centimeters. Multiplying 120 square feet by 30.48 would be incorrect: an area factor must be squared. Use a dedicated area method for floor surfaces, and distinguish nominal product sizes from the dimensions you measured before deciding whether an item fits.
Use the Feet Converter for this calculation
Open the Feet Converter, leave Foot in the From menu, and choose Centimeter in the To menu. Enter the measurement as decimal feet, such as 6 or 2.75. The converter initially displays meters, so checking the destination menu is essential for a centimeters answer. The arithmetic happens in the browser and the result changes when the value or either unit changes. Record the displayed unit along with the number.
For 5 ft 8 in, the simplest alternative is to change From to Inch and enter 68, then select Centimeter. The current tool accepts one numeric measurement rather than a mixed feet-and-inches string. Do not paste 5'8 into its value field. Keeping the conversion in one unit also makes a spreadsheet easier to audit: a column of total inches avoids mixing decimal feet with feet-and-inches labels across different rows.
Spreadsheet formulas and independent checks
If cell A2 contains decimal feet, =A2*30.48 returns centimeters. If A2 contains whole feet and B2 contains the additional inches, =(A2*12+B2)*2.54 combines them correctly. Label the columns Feet, Inches, and Centimeters rather than leaving the units implicit. A nonnegative mixed measurement normally has an inches remainder below 12; normalize 5 ft 14 in to 6 ft 2 in before presenting it to a reader.
For a reverse check, divide the centimeter result by 30.48 to recover decimal feet. For mixed notation, divide centimeters by 2.54, take complete groups of 12 inches as feet, and retain the remaining inches. Starting with 172.72 cm gives 68 inches, or 5 ft 8 in. A rounded centimeter input may produce a fractional remainder, which is expected and should be rounded only to the chosen measurement increment.
Rounding and measurement limits
The conversion constant is exact, while the source measurement may be approximate. If a form asks for the nearest centimeter, 172.72 cm rounds to 173 cm. If a source height was rounded to the nearest inch, reporting six decimal places implies detail that was never measured. Decide the reporting increment from the destination's instructions, preserve the unrounded arithmetic for checking, and round once at the end of the process.
This guide uses the international foot. Historical survey records can use another foot definition, so identify their standard before processing coordinates or elevations. Ordinary height and product conversions generally use the international relationship shown here. To finish a reliable calculation, confirm the notation, combine mixed units, apply the factor, and compare the answer with a neighboring chart value. A correct conversion changes the unit while preserving the original length.