# barn to square millimetre conversion

Conversion number between barn [b] and square millimetre [mm²] is 1.0 × 10-22. This means, that barn is smaller unit than square millimetre.

### Contents [show][hide]

Switch to reverse conversion:
from square millimetre to barn conversion

### Enter the number in barn:

Decimal Fraction Exponential Expression
 [b]
eg.: 10.12345 or 1.123e5

Result in square millimetre

?
 precision 0 1 2 3 4 5 6 7 8 9 [info] Decimal: Exponential:

### Calculation process of conversion value

• 1 barn = (exactly) (1*10^-28) / (0.000001) = 1.0 × 10-22 square millimetre
• 1 square millimetre = (exactly) (0.000001) / (1*10^-28) = 1.0 × 10+22 barn
• ? barn × (1*10^-28  ("m²"/"barn")) / (0.000001  ("m²"/"square millimetre")) = ? square millimetre

### High precision conversion

If conversion between barn to square-metre and square-metre to square millimetre is exactly definied, high precision conversion from barn to square millimetre is enabled.

Decimal places: (0-800)

barn
Result in square millimetre:
?

### barn to square millimetre conversion chart

 Start value: [barn] Step size [barn] How many lines? (max 100)

visual:
barnsquare millimetre
00
101.0 × 10-21
202.0 × 10-21
303.0 × 10-21
404.0 × 10-21
505.0 × 10-21
606.0 × 10-21
707.0 × 10-21
808.0 × 10-21
909.0 × 10-21
1001.0 × 10-20
1101.1 × 10-20
Copy to Excel

## Multiple conversion

Enter numbers in barn and click convert button.
One number per line.

Converted numbers in square millimetre:
Click to select all

## Details about barn and square millimetre units:

Convert Barn to other unit:

### barn

Definition of barn unit: ≡ 10−28 m². Originally used in nuclear physics for expressing the cross sectional area of nuclei and nuclear reactions.

Convert Square millimetre to other unit:

### square millimetre

Definition of square millimetre unit: = 1 mm x 1 mm.

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