# Centimetres

Enter the value to convert into the box and modify the accuracy of the conversion by selecting number of significant figures or decimal places by clicking on the boxes provided.

Conversion Formulae

The conversion formula for centimetres (cm) to inches (in) conversions is as follows:

• 1 centimetre = 0.39370079 inches

The conversion formula for inches (in) to centimetres (cm) conversions is as follows:

• 1 inch = 2.54 centimetres
Centimetres

The centimetre is 1/100 of a metre and are often used when measuring a persons height.

SI Metric

### Definition

The centimetre is defined as one hundredth of a metre.

Metre

Formal: cm

### Information

The centimetre is an SI metric unit of length with the standard SI prefix centi indicating that it is 10-2 metres.

Centimetres are the closest metric unit to the inch and are commonly shown on rulers alongside inches in countries that formerly used the inch as a unit of measurement.

Wikipedia: Centimetre

BIPM: SI Standard Prefixes

Centiimetres are used worldwide for scientific applications and in the vast majority of countries worldwide in day to day use. The major exceptions being the United States and Liberia, where the metric system has not been adopted. In the UK, Canada and other former British Commonwealth countries metric units such as the centimetre may not be used all the time.

### Conversion Formulae

• 1 centimetre = 10,000 micrometres
• 1 centimetre = 10 millimetres
• 1 centimetre = 0.1 decimetres
• 1 centimetre = 0.01 metres
• 1 centimetre = 0.001 decametres
• 1 centimetre = 0.0001 hectometres
• 1 centimetre = 0.00001 kilometres
• 1 centimetre = 0.00000001 megametres

• 1 micrometre = 0.0001 centimetres
• 1 millimetre = 0.1 centimetres
• 1 decimetre = 10 centimetres
• 1 metre = 100 centimetres
• 1 decametre = 1,000 centimetres
• 1 hectometre = 10,000 centimetres
• 1 kilometre = 100,000 centimetres
• 1 megametre = 100,000,000 centimetres
Inches

The inch is 1/36th of a yard, it is often used for measuring height, together with feet, in countries that use or have used Imperial or US Customary measurements.

### Unit System

Imperial & US Customary

### Definition

The inch is defined as 1/36th of a yard.

Yard

### Abbreviation

Formal: in

The abbreviation ins is sometimes seen for greater than one inch.

### Information

The inch derives from Roman unciae (twelfth parts of a Roman foot) with Roman measurements being in use in Great Britain this unit may well have continued in use after the Romans left.

The earliest recorded definition of the inch defines it as three barleycorns in length, however this definition was around 1300 in the 'The Composition of Yards and Perches' according to some sources. However the Liber Horn (1311), an early book of English statutes, suggests that the inch was defined 1/36th part of an iron yard held by the king.

At some point prior to the implementation of the Weights and Measures Act of 1824 the inch had become defined as 1/36th of a yard via 36in = 3ft = 1yd and the use of standard yards. The Weights and Measures Act of 1824 was used to remove any ambiguity of definitions left by prior statutes.

Wikipedia: Inch

Wikipedia: Liber Horn (1311) author Andrew Horn

UK National Archives: Liber Horn

Wikipedia: Composition of Yards and Perches

Wikipedia: UK Weights and Measures Acts

Inches are a standard unit of length in the United States and Liberia and are still used informally in the United Kingdom and other British Commonwealth countries that formerly used Imperial units as standard.

### Conversion Formulae

• 1 inch = 0.25 hands
• 1 inch = 0.083333333 feet
• 1 inch = 0.027777778 yards
• 1 inch = 0.001262626 chains
• 1 inch = 0.000126263 furlongs
• 1 inch = 0.000015783 miles

Conversions accurate to 9 decimal places.

• 1 hand = 4 inches
• 1 foot = 12 inches
• 1 yard = 36 inches
• 1 chain = 792 inches
• 1 furlong = 7,920 inches
• 1 mile = 63,360 inches

Conversions accurate to 9 decimal places.

Common Conversions cm to in
 cm in 1 0.39 2 0.79 3 1.18 4 1.57 5 1.97 6 2.36 7 2.76 8 3.15 9 3.54 10 3.94
 cm in 10 3.94 20 7.87 30 11.81 40 15.75 50 19.69 60 23.62 70 27.56 80 31.50 90 35.43 100 39.37
 cm in 100 39.37 200 78.74 300 118.11 400 157.48 500 196.85 600 236.22 700 275.59 800 314.96 900 354.33 1,000 393.70
Common Conversions in to cm
 in cm 1 2.54 2 5.08 3 7.62 4 10.16 5 12.70 6 15.24 7 17.78 8 20.32 9 22.86 10 25.40 11 27.94 12 30.48
 in cm 12 30.48 24 60.96 36 91.44 48 121.92 60 152.40 72 182.88 84 213.36 96 243.84 108 274.32 120 304.80 132 335.28 144 365.76