Convert Fermis (fm) to Millimetres (mm) | fm in mm

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# Let's convert Fermis (fm) to Millimetres (mm)

This quick and easy calculator will convert Fermis (fm) to Millimetres (mm) and show formula, brief history on the units and quick maths for the conversion.

## Quick Reference for Converting Fermis to Millimetres

Formula
mm = fm / 1000000000000
Quick Rough Maths
To get the Millimetres, divide the number of Fermis by 1000 billion
Fermis (fm) in 1 Millimetre
There are 1000000000000 Fermis in 1 Millimetre
Millimetres (mm) in 1 Fermi
There are 0 Millimetres in 1 Fermi

## Unit Information

Fermi
/ˈfəːmi/
Symbol: fm
Unit System: Non-SI metric

### What is the Fermi?

The fermis is a unit of length in the non-SI metric system and uses the symbol fm.

One fermi is equal to 1×10−15m or 3.9370×10−14 in.

It is used to measure nuclear distances and was named after the Italian physicist Enrico Fermi (1901–1954). It has now been replaced with the SI-derived term femtometre.

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.

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