Feet to CM Converter

How to convert feet to centimeters

Converting feet to centimeters is a single multiplication. The formula is ft × 30.48 = cm, which means one foot equals 30.48 cm. Going the other way, one centimeter equals 0.0328084 ft.

The calculator above applies this automatically as you type, but it is worth knowing the arithmetic if you need to sanity-check a figure or work one out without a device to hand.

Worked examples

7 ft to cm: multiply 7 by 30.48, which gives 213.36 cm.

45 ft to cm: multiply 45 by 30.48, which gives 1,371.6 cm.

250 ft to cm: multiply 250 by 30.48, which gives 7,620 cm.

Feet to CM conversion table

The values below are calculated with the same function as the converter above, so they agree to the digit. Use it as a quick reference when you need a rough figure without typing anything.

What is a foot?

A foot is twelve inches, or exactly 0.3048 meters. It sits between the inch and the yard in the imperial and US customary systems.

Where the foot came from

The foot is one of the oldest units in continuous use, derived from the length of a human foot and appearing in Greek, Roman, and medieval European measurement. Its exact length varied widely by region until the 1959 agreement standardised it.

Where feet are used today

In the US, feet are the default for room dimensions, building heights, and property. They persist internationally in aviation, where altitude is given in feet almost everywhere, and in describing a person's height in the US and UK.

• A standard ruler is 1 foot
• A kitchen counter is about 3 feet high
• A basketball hoop is 10 feet up

What is a centimeter?

A centimeter is one hundredth of a meter, the SI base unit of length. Since 1983 the meter has been defined as the distance light travels in a vacuum in 1/299,792,458 of a second, so a centimeter is an exact fraction of that definition rather than a physical artifact.

Where the centimeter came from

The centimeter arrived with the metric system created in revolutionary France in the 1790s, which set out to replace a tangle of regional units with one decimal system. It was central to the CGS (centimeter-gram-second) system that dominated science through the 19th century before SI standardised on the meter.

Where centimeters are used today

It is the everyday metric unit for anything you could hold or stand next to: body height, clothing and furniture dimensions, paper sizes, rainfall. Most of the world quotes a person's height in centimeters, which is why height conversion is one of the most common reasons anyone reaches for this particular calculation.

• A standard pencil is about 19 cm long
• A credit card is 8.56 cm wide
• A door is roughly 200 cm tall

When you actually need this conversion

feet belong to the imperial / us customary system and centimeters to the metric (si) system, so this conversion turns up whenever information crosses between countries that measure differently.

Accuracy, precision, and rounding

The factor used here (ft × 30.48 = cm) is derived from an internationally agreed exact definition, so the conversion itself is not an approximation. The results above are shown to about eight significant figures, which is more precision than almost any practical use requires.

The sensible rule is to round the answer to roughly the same precision as the number you started with. If you measured to the nearest foot, an answer carrying six decimal places is not more accurate, it just looks more accurate. For most everyday purposes one or two decimal places is plenty.

Common mistakes to avoid

Converting in the wrong direction

Multiplying when you should divide is by far the most common error, and it is easy to miss because the result is still a number in a believable range. A quick check: since one foot is 30.48 cm, a foot value should get larger when converted.

Using a rounded factor for a long calculation

Rounding the conversion factor before multiplying, then repeating that across many values, compounds the error. Convert with the full factor and round only the final answer.

Converting feet to centimeters in a spreadsheet or in code

A one-off answer is what the calculator above is for. When you have a whole column of figures, or you are writing something that has to do the conversion repeatedly, it is worth putting the formula in the tool you are already working in.

Excel and Google Sheets

With your foot value in cell A1, put this in B1 and fill it down the column:

=A1 * 30.48

Excel also ships a built-in CONVERT function that handles many unit pairs directly, but it does not cover every unit and its unit codes are easy to mistype. An explicit formula like the one above is harder to get wrong and shows its working.

Python

def ft_to_cm(value):
    return value * 30.48

print(ft_to_cm(10))

JavaScript

const ftToCm = (value) => value * 30.48;

console.log(ftToCm(10));

Store the factor as a named constant rather than typing 30.48 at each call site. When a figure appears in three places it will eventually be updated in two of them.

The two measurement systems behind this conversion

This conversion sits on the fault line between the two measurement systems still in everyday use. The metric system was designed in one go in the 1790s as a coherent decimal scheme, where every unit relates to the next by a power of ten. The imperial and US customary systems grew instead by accretion over centuries, which is why their relationships are numbers like 12, 16, 5,280, and 43,560 rather than round ones.

Only three countries have not formally adopted the metric system: the United States, Liberia, and Myanmar. In practice the picture is messier than that, since the US uses metric units throughout science, medicine, and the military, while metric countries still buy screens and tires by the inch. That overlap is exactly why conversions like this one stay necessary.

More questions about feet and centimeters

Is the conversion exact or approximate?

The underlying definition is exact, and the factor shown here (30.48) is that definition expressed to the precision this page displays. For any everyday purpose the result is exact; only at very high precision would you need more digits of the factor.

Why does the answer have so many decimal places?

The converter shows a high-precision result so that it is never the limiting factor in your calculation. It is up to you to round to something sensible. A measurement taken with a tape measure does not become more accurate because the conversion carried six decimals.

Can I convert in the opposite direction on this page?

Yes. The swap button in the calculator reverses the conversion and carries the current result across as the new input, so you do not have to navigate anywhere or retype anything. The second table above also lists the reverse conversion directly.

Does anything get sent to a server?

No. The arithmetic runs in your browser with a few lines of JavaScript. Nothing you type is uploaded, logged, or stored, which also means the converter keeps working if your connection drops after the page has loaded.

Which figure should I use on an official form?

Use whatever precision the form asks for, and if it does not say, match the precision of the original measurement. For height, weight, and similar personal details, one decimal place is almost always sufficient and often more than is wanted.

Related length conversions

If you need to go the other way as a starting point rather than as a swap, the CM to Feet converter is the mirror of this page: same factor, same tables, opposite direction. It is the more natural place to start when most of your figures are already in centimeters.

Length conversions rarely arrive alone. A set of dimensions usually mixes scales, so these cover the neighbouring pairs you are likely to need in the same sitting:

• CM to Inches - Convert centimeters to inches instantly. Enter any value and get the exact result in decimal inches.
• MM to Inches - Convert millimeters to inches quickly and accurately. Ideal for engineering, woodworking, and crafts.
• Meters to Feet - Convert meters to feet instantly. Useful for height, room dimensions, and construction measurements.
• KM to Miles - Convert kilometers to miles instantly. Great for travel distances, running routes, and road trips.
• Inches to Feet - Convert inches to feet quickly. Useful for construction, interior design, and measurements.
• Meters to Yards - Convert meters to yards instantly. Commonly used in sports fields, fabric, and landscaping.

For anything not listed here, the full converter directory covers over a hundred pairs across length, weight, temperature, volume, area, speed, pressure, energy, and more.

Quick reference

Why Use Our Feet to CM Converter?

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