How many cm is 1 micrometer?

0.0001 cm, which is one ten thousandth of a centimetre. The division scales by moving the decimal point: 10 µm is 0.001 cm, 100 µm is 0.01 cm, 1,000 µm is 0.1 cm and 10,000 µm is exactly 1 cm. Going past that stays just as simple, with 25,000 µm reading 2.5 cm and 12,345 µm reading 1.2345 cm.

What is the formula for micrometers to cm?

cm = µm / 10,000, or cm = µm × 0.0001 if you prefer to multiply. The reverse is µm = cm × 10,000, so 1 cm is 10,000 µm, 2.54 cm is 25,400 µm and 5 cm is 50,000 µm. The swap button between the two boxes reverses the pair, which turns this into a centimetres to micrometres converter without a reload.

Worked example: how thick is a 70 micrometre human hair in cm?

0.007 cm. Type 70 into the From box and the list underneath gives the same thickness in the other length units at once: 0.07 mm, 0.00007 m, 0.00275590551181 in and, behind the uncommon units switch, 70,000 nm. Each row has its own Copy button, and Copy result in the strip above copies the headline figure without the thousands separators it is displayed with.

Is a micron the same as a micrometer?

Yes, exactly the same length. Micron was the official name until 1967, when the metric system dropped it in favour of micrometre, and the older word stayed in use in machining, filtration and microscopy. This converter labels the unit Micrometre (µm) in both menus. The symbol is the Greek letter mu, µ, which is why it is often typed as um or written micron when the character is awkward to reach.

Is a micron the same as a mil or a thou?

No, and mistaking one for the other is a factor of 25.4. A thou, also called a mil, is a thousandth of an inch, which is exactly 25.4 micrometres, so 10 mil is 254 µm and 100 mil is 2,540 µm. The converter carries the thou as an uncommon unit: tick Show 7 more in the readout strip and the list adds a row where 1 µm reads 0.0393700787402 mil. An inch is 25,400 µm or 1,000 mil either way you count it.

Why did my answer come back as 5e-7 cm?

Because anything below 0.000001 is printed in exponential notation rather than as a run of leading zeroes. At this scale that boundary is close: 0.01 µm is 0.000001 cm, the last value shown in full, while 0.005 µm reads 5e-7 cm and 0.001 µm reads 1e-7 cm. The same thing happens further down the unit list, where 1 µm reads 1e-9 km and 6.213712e-10 mi. Pick a smaller unit if you want a readable figure, since 1 µm is a clean 1,000 nm.

What else does the page show for 1 micrometre?

The same length in every common length unit at once: 0.001 mm, 0.0001 cm, 0.000001 m, 1e-9 km, 0.0000393700787402 in, 0.00000328083989501 ft, 0.00000109361329834 yd, 6.213712e-10 mi and 5.399568e-10 nmi. The micrometre itself is one of the uncommon units in this category, which changes nothing about the headline conversion: it is in both unit menus, and the Show 7 more switch only adds rows to the list below, among them 1,000 nm and 0.0393700787402 mil.

Why does the page open on micrometres and centimetres when I last converted something else?

Because a page that names a pair should show that pair. This one sets micrometres and centimetres on arrival, ahead of whatever the converter last remembered, and it leaves the main unit converter alone: go back to the converter itself and it is still on the pair you left it on. The number you last typed does travel with you. The conversion is arithmetic against a table of factors that ships with the page, so it runs in your browser with nothing uploaded and no account.

Micrometers to CM Converter

A micrometre is a millionth of a metre and a centimetre is a hundredth, so a centimetre holds exactly 10,000 micrometres and the conversion is one division: cm = µm / 10,000. Both units come from the metre by SI prefixes, so that 10,000 is a definition rather than a measurement and the division adds no error of its own. In decimal it is the point moving four places to the left, which is why 1 µm is 0.0001 cm, 10 µm is 0.001 cm, 50 µm is 0.005 cm, 70 µm is 0.007 cm, 200 µm is 0.02 cm, 1,000 µm is 0.1 cm and 12,345 µm is 1.2345 cm. Two landmarks are worth holding on to: 10,000 µm is exactly 1 cm, and 25,400 µm is exactly 2.54 cm, which is one inch. Back the other way, µm = cm × 10,000, so 1 cm is 10,000 µm and 0.007 cm is 70 µm. This page opens with Micrometre (µm) in the From box and Centimetre (cm) in the To box, ahead of whatever pair the converter last remembered, prints twelve significant digits, and switches to exponential notation below 0.000001, so 0.005 µm reads 5e-7 cm. The list under the answer repeats the same length in millimetres, metres, kilometres, inches, feet, yards and miles at once.

From

To0.0001

1 µm in every length unit

Millimetremm
0.001
Centimetrecm
0.0001
Metrem
0.000001
Kilometrekm
1e-9
Inchin
0.0000393700787402
Footft
0.00000328083989501
Yardyd
0.00000109361329834
Milemi
6.213712e-10
Nautical milenmi
5.399568e-10

Common questions

How many cm is 1 micrometer?: 0.0001 cm, which is one ten thousandth of a centimetre. The division scales by moving the decimal point: 10 µm is 0.001 cm, 100 µm is 0.01 cm, 1,000 µm is 0.1 cm and 10,000 µm is exactly 1 cm. Going past that stays just as simple, with 25,000 µm reading 2.5 cm and 12,345 µm reading 1.2345 cm.
What is the formula for micrometers to cm?: cm = µm / 10,000, or cm = µm × 0.0001 if you prefer to multiply. The reverse is µm = cm × 10,000, so 1 cm is 10,000 µm, 2.54 cm is 25,400 µm and 5 cm is 50,000 µm. The swap button between the two boxes reverses the pair, which turns this into a centimetres to micrometres converter without a reload.
Worked example: how thick is a 70 micrometre human hair in cm?: 0.007 cm. Type 70 into the From box and the list underneath gives the same thickness in the other length units at once: 0.07 mm, 0.00007 m, 0.00275590551181 in and, behind the uncommon units switch, 70,000 nm. Each row has its own Copy button, and Copy result in the strip above copies the headline figure without the thousands separators it is displayed with.
Is a micron the same as a micrometer?: Yes, exactly the same length. Micron was the official name until 1967, when the metric system dropped it in favour of micrometre, and the older word stayed in use in machining, filtration and microscopy. This converter labels the unit Micrometre (µm) in both menus. The symbol is the Greek letter mu, µ, which is why it is often typed as um or written micron when the character is awkward to reach.
Is a micron the same as a mil or a thou?: No, and mistaking one for the other is a factor of 25.4. A thou, also called a mil, is a thousandth of an inch, which is exactly 25.4 micrometres, so 10 mil is 254 µm and 100 mil is 2,540 µm. The converter carries the thou as an uncommon unit: tick Show 7 more in the readout strip and the list adds a row where 1 µm reads 0.0393700787402 mil. An inch is 25,400 µm or 1,000 mil either way you count it.
Why did my answer come back as 5e-7 cm?: Because anything below 0.000001 is printed in exponential notation rather than as a run of leading zeroes. At this scale that boundary is close: 0.01 µm is 0.000001 cm, the last value shown in full, while 0.005 µm reads 5e-7 cm and 0.001 µm reads 1e-7 cm. The same thing happens further down the unit list, where 1 µm reads 1e-9 km and 6.213712e-10 mi. Pick a smaller unit if you want a readable figure, since 1 µm is a clean 1,000 nm.
What else does the page show for 1 micrometre?: The same length in every common length unit at once: 0.001 mm, 0.0001 cm, 0.000001 m, 1e-9 km, 0.0000393700787402 in, 0.00000328083989501 ft, 0.00000109361329834 yd, 6.213712e-10 mi and 5.399568e-10 nmi. The micrometre itself is one of the uncommon units in this category, which changes nothing about the headline conversion: it is in both unit menus, and the Show 7 more switch only adds rows to the list below, among them 1,000 nm and 0.0393700787402 mil.
Why does the page open on micrometres and centimetres when I last converted something else?: Because a page that names a pair should show that pair. This one sets micrometres and centimetres on arrival, ahead of whatever the converter last remembered, and it leaves the main unit converter alone: go back to the converter itself and it is still on the pair you left it on. The number you last typed does travel with you. The conversion is arithmetic against a table of factors that ships with the page, so it runs in your browser with nothing uploaded and no account.

Conversion factors are the exact legal definitions where one exists. An inch is exactly 2.54 cm and a pound exactly 0.45359237 kg, so those conversions are exact rather than approximate. Temperature uses offsets rather than factors, and that is shown in the working.