What is 31mm in Inches?

You are: Home > Length > Millimetres to Inches

What is 31 Millimetres (31mm) in Inches (in)?

What is 31mm in in? Convert 31 Millimetres (31mm) to Inches (in) and show formula, brief history on the units and quick maths for the conversion.

Enter Millimetres to convert to Inches


Quick Reference for Converting Millimetres to Inches

Formula
in = mm / 25.4
Quick Rough Maths
To get the Inches, divide the number of Millimetres by 25.4
Millimetres (mm) in 1 Inch
There are 25.4 Millimetres in 1 Inch
Inches (in) in 1 Millimetre
There are 0.04 Inches in 1 Millimetre

Unit Information

Millimetre
/ˈmɪlɪmiːtə/
Symbol: mm
Unit System: SI

What is the Millimetre?

The millimetre (American spelling millimeter) is a unit of length and is a multiple of the SI unit metre. It uses the symbol mm.

There are 1000 mm in 1 m and 10 mm in 1 cm. From this one can derive that there are 0.03937 in.

The millimetre is sometimes verbally abbreviated to 'mil' - which can cause confusion in the US as there is a unit there that means thousandth of an inch.

Inch
/ɪn(t)ʃ/
Symbol: in
Unit System: Imperial

What is the Inch?

The inch is a unit of length in the imperial unit system with the symbol in.

There are 12 inches in a foot and 3 feet in a yard. Therefore there are 36 inches in a yard. There are exactly 2.54 centimetres in an inch.

Borrowed from the Latin 'uncia' - the English word 'inch', the origination of the word came from the Old English word for 'ounce' which was related to the Roman phrase for "one twelfth".

The inch is still a commonly used unit in the UK, USA and Canada - and is also still used in the production of electronic equipment, still very evident in the measuring of monitor and screen sizing.


Conversion Tables for Millimetres (mm) to Inches (in)