SI Prefixes

Numerical values associated with parts are often specified with metric prefixes to their units such as "milli-"meters, "kilo-"bytes, "nano-"farads and so on. To better facilitate search capability and other numerical processing, you can use these prefix abbreviations when entering some numerical values.

Aligni supports SI Prefixes for value entry. When you enter a value for a part, two items are stored along with the part:

  1. Value – This is a floating point representation of the value. This storage is helpful for performing searches based on value and tolerance. (i.e. find all parts within 10% of value 4.7k)
  2. Value Text – This is the actual text that is entered. This helps resolve the ambiguity between what a human likes to see and what the floating point value is. For example, “10n” and “0.01 u” are equivalent values for the same capacitor, but some people prefer to see it represented as the latter rather than the former. Aligni stores text the way you enter it for this reason.

Supported SI Prefixes

10n Prefix Symbol Decimal equivalent
1024 yotta Y 1 000 000 000 000 000 000 000 000
1021 zetta Z 1 000 000 000 000 000 000 000
1018 exa E 1 000 000 000 000 000 000
1015 peta P 1 000 000 000 000 000
1012 tera T 1 000 000 000 000
109 giga G 1 000 000 000
106 mega M 1 000 000
103 kilo k 1 000
102 hecto h 100
101 deca, deka da 10
100 (none) (none) 1
10−1 deci d 0.1
10−2 centi c 0.01
10−3 milli m 0.001
10−6 micro µ (u) 0.000 001
10−9 nano n 0.000 000 001
10−12 pico p 0.000 000 000 001
10−15 femto f 0.000 000 000 000 001
10−18 atto a 0.000 000 000 000 000 001
10−21 zepto z 0.000 000 000 000 000 000 001
10−24 yocto y 0.000 000 000 000 000 000 000 001

Supported IEC Standard Prefixes

Name Symbol Base 2 Base 10
kibi Ki 210 = 1,024 > 103
mebi Mi 220 = 1,048,576 > 106
gibi Gi 230 = 1,073,741,824 > 109
tebi Ti 240 = 1,099,511,627,776 > 1012
pebi Pi 250 = 1,125,899,906,842,624 > 1015
exbi Ei 260 = 1,152,921,504,606,846,976 > 1018
zebi Zi 270 = 1,180,591,620,717,411,303,424 > 1021
yobi Yi 280 = 1,208,925,819,614,629,174,706,176 > 1024