Exa (E)

The SI prefix exa (E): a factor of 10¹⁸, which is one quintillion (10¹⁸).

What is an exa unit?

Symbol: E
Quantity: SI Prefixes
Unit system: SI
Definition: The SI prefix exa (E): a factor of 10¹⁸, which is one quintillion (10¹⁸).
Exact: Yes, the value is exact by definition
Source: SI Brochure, 9th edition (BIPM, 2019)

Used for exabytes of data traffic and for exajoules (EJ), the unit in which national and world energy statistics are often given.

Exa in other units
Exa	Kilo	Milli	Quetta
1 E	= 1e+15 k	= 1e+21 m	= 1e-12 Q
10 E	= 1e+16 k	= 1e+22 m	= 1e-11 Q
100 E	= 1e+17 k	= 1e+23 m	= 1e-10 Q
1000 E	= 1e+18 k	= 1e+24 m	= 1e-9 Q

The next smaller si prefixes unit is the peta unit (P). 1 E = 1000 P, and 1 P = 0.001 E.

The next larger si prefixes unit is the zetta unit (Z). 1 E = 0.001 Z, and 1 Z = 1000 E.

How many kilo units are in one exa unit?: One exa unit = 1e+15 k (kilo units).
How many milli units are in one exa unit?: One exa unit = 1e+21 m (milli units).
How many quetta units are in one exa unit?: One exa unit = 1e-12 Q (quetta units).