{"id":55,"date":"2006-05-31T11:05:37","date_gmt":"2006-05-31T11:05:37","guid":{"rendered":"https:\/\/www.garfnet.org.uk\/cms\/metric-prefixes\/"},"modified":"2025-10-27T02:34:02","modified_gmt":"2025-10-27T02:34:02","slug":"metric-prefixes","status":"publish","type":"page","link":"https:\/\/garfnet.org.uk\/cms\/tables\/general\/metric-prefixes\/","title":{"rendered":"Metric prefixes"},"content":{"rendered":"

These are the commonly used SI metric multiplier prefixes… <\/b><\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Unit<\/strong><\/div><\/td>\n
Abbreviation<\/strong><\/div><\/td>\n
Factor (power of ten)<\/strong><\/div><\/td>\n
Factor (number)<\/strong><\/div><\/td>\n<\/tr>\n
Quetto<\/strong><\/div><\/td>\n
q<\/div><\/td>\n
1.E-30<\/div><\/td>\n
0.000000000000000000000000000001<\/div><\/td>\n<\/tr>\n
Ronno<\/strong><\/div><\/td>\n
r<\/div><\/td>\n
1.E-27<\/div><\/td>\n
0.000000000000000000000000001<\/div><\/td>\n<\/tr>\n
Yotto<\/strong><\/div><\/td>\n
y<\/div><\/td>\n
1.E-24<\/div><\/td>\n
0.000000000000000000000001<\/div><\/td>\n<\/tr>\n
Zepto<\/strong><\/div><\/td>\n
z<\/div><\/td>\n
1.E-21<\/div><\/td>\n
0.000000000000000000001<\/div><\/td>\n<\/tr>\n
Atto<\/strong><\/div><\/td>\n
a<\/div><\/td>\n
1.E-18<\/div><\/td>\n
0.000000000000000001<\/div><\/td>\n<\/tr>\n
Femto<\/strong><\/div><\/td>\n
f<\/div><\/td>\n
1.E-15<\/div><\/td>\n
0.000000000000001<\/div><\/td>\n<\/tr>\n
Pico<\/strong><\/div><\/td>\n
p<\/div><\/td>\n
1.E-12<\/div><\/td>\n
0.000000000001<\/div><\/td>\n<\/tr>\n
Nano<\/strong><\/div><\/td>\n
n<\/div><\/td>\n
1.E-09<\/div><\/td>\n
0.000000001<\/div><\/td>\n<\/tr>\n
Micro<\/strong><\/div><\/td>\n
\u00b5<\/div><\/td>\n
1.E-06<\/div><\/td>\n
0.000001<\/div><\/td>\n<\/tr>\n
Milli<\/strong><\/div><\/td>\n
m<\/div><\/td>\n
1.E-03<\/div><\/td>\n
0.001<\/div><\/td>\n<\/tr>\n
Centi<\/strong><\/div><\/td>\n
c<\/div><\/td>\n
1.E-02<\/div><\/td>\n
0.01<\/div><\/td>\n<\/tr>\n
Deci<\/strong><\/div><\/td>\n
d<\/div><\/td>\n
1.E-01<\/div><\/td>\n
0.1<\/div><\/td>\n<\/tr>\n
\u00a0<\/div><\/td>\n
(none)<\/div><\/td>\n
\u00a00<\/div><\/td>\n
1<\/div><\/td>\n<\/tr>\n
Deca<\/strong><\/div><\/td>\n
da<\/div><\/td>\n
1.E+01<\/div><\/td>\n
10<\/div><\/td>\n<\/tr>\n
Hecto<\/strong><\/div><\/td>\n
h<\/div><\/td>\n
1.E+02<\/div><\/td>\n
100<\/div><\/td>\n<\/tr>\n
Kilo<\/strong><\/div><\/td>\n
k<\/div><\/td>\n
1.E+03<\/div><\/td>\n
1,000<\/div><\/td>\n<\/tr>\n
Myria<\/strong><\/div><\/td>\n
(rare)<\/div><\/td>\n
1.E+04<\/div><\/td>\n
10,000<\/div><\/td>\n<\/tr>\n
Mega<\/strong><\/div><\/td>\n
M<\/div><\/td>\n
1.E+06<\/div><\/td>\n
1,000,000<\/div><\/td>\n<\/tr>\n
Giga<\/strong><\/div><\/td>\n
G<\/div><\/td>\n
1.E+09<\/div><\/td>\n
1,000,000,000<\/div><\/td>\n<\/tr>\n
Tera<\/strong><\/div><\/td>\n
T<\/div><\/td>\n
1.E+12<\/div><\/td>\n
1,000,000,000,000<\/div><\/td>\n<\/tr>\n
Peta<\/strong><\/div><\/td>\n
P<\/div><\/td>\n
1.E+15<\/div><\/td>\n
1,000,000,000,000,000<\/div><\/td>\n<\/tr>\n
Exa<\/strong><\/div><\/td>\n
E<\/div><\/td>\n
1.E+18<\/div><\/td>\n
1,000,000,000,000,000,000<\/div><\/td>\n<\/tr>\n
Zetta<\/strong><\/div><\/td>\n
Z<\/div><\/td>\n
1.E+21<\/div><\/td>\n
1,000,000,000,000,000,000,000<\/div><\/td>\n<\/tr>\n
Yotta<\/strong><\/div><\/td>\n
Y<\/div><\/td>\n
1.E+24<\/div><\/td>\n
1,000,000,000,000,000,000,000,000<\/div><\/td>\n<\/tr>\n
Ronna<\/strong><\/div><\/td>\n
R<\/div><\/td>\n
1.E+27<\/div><\/td>\n
1,000,000,000,000,000,000,000,000,000<\/div><\/td>\n<\/tr>\n
Quetta<\/strong><\/div><\/td>\n
Q<\/div><\/td>\n
1.E+30<\/div><\/td>\n
1,000,000,000,000,000,000,000,000,000,000<\/div><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Updated 2022-11-29 to take into account the new metric prefixes agreed at General Conference on Weights and Measures (CGPM) 2022. More info.<\/a><\/p>\n

\n

Home<\/a> | Tables<\/a> | General<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

These are the commonly used SI metric multiplier prefixes… Unit Abbreviation Factor (power of ten) Factor (number) Quetto q 1.E-30 0.000000000000000000000000000001 Ronno r 1.E-27 0.000000000000000000000000001 Yotto y 1.E-24 0.000000000000000000000001 Zepto z 1.E-21 0.000000000000000000001 Atto a 1.E-18 0.000000000000000001 Femto f 1.E-15 0.000000000000001 Pico p 1.E-12 0.000000000001 Nano n 1.E-09 0.000000001 Micro \u00b5 1.E-06 0.000001 Milli m…<\/p>\n","protected":false},"author":1,"featured_media":34587,"parent":646,"menu_order":17,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ngg_post_thumbnail":0,"_kad_post_transparent":"default","_kad_post_title":"default","_kad_post_layout":"default","_kad_post_sidebar_id":"","_kad_post_content_style":"default","_kad_post_vertical_padding":"default","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-55","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"\nMetric prefixes - 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