exa

Prefix denoting 10 to the 18th power

Also known as E · exa- · exa prefix · exa SI prefix · ×10^18 · x10^18

Instance of: SI prefix
1
Sources
1.Stated in ISO 80000-1:2009 Quantities and units—Part 1: General
View statement on Wikidata ↗
, UCUM prefix

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decimal. Each prefix has a unique symbol that is prepended to any unit symbol. The prefix kilo, for example, may be added to gram to indicate multiplication by one thousand: one kilogram is equal to one thousand grams. The prefix milli, likewise, may be added to metre to indicate division by one thousand, so one millimetre is equal to one thousandth of a metre.

Overview

All data

25 statements · 20% with external sources · numbers in brackets are citations

Numeric value: 1000Q
Follows: peta
1
Sources
1.Stated in ISO 80000-1:2009 Quantities and units—Part 1: General
View statement on Wikidata ↗
Followed by: zetta
1
Sources
1.Stated in ISO 80000-1:2009 Quantities and units—Part 1: General
View statement on Wikidata ↗
Defining formula: 10^{18}
1
Sources
1.Stated in ISO 80000-1:2009 Quantities and units—Part 1: General
View statement on Wikidata ↗
Unit symbol: E
Different from: exbi
E notation
Discovered: 1975
Uses: E/e applies to part: symbol

On other databases

14 identifiers linking exa across the web's reference databases

Data quality

statements

20%

externally sourced

Source last edited November 1, 2026. AIDb refreshes this page daily.

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AIDb. (2026). exa (Q152411). Retrieved from https://aidb.si/e/exa-Q152411