Base unit (no prefix) (×1)

The unit itself with no prefix: a factor of 10⁰, which is exactly 1.

What is a base unit?

Symbol: ×1
Quantity: SI Prefixes
Unit system: SI
Definition: The unit itself with no prefix: a factor of 10⁰, which is exactly 1.
Exact: Yes, the value is exact by definition
Source: SI Brochure, 9th edition (BIPM, 2019)

The unit itself, with no prefix. Converting to and from it shows how many meters, grams, watts or any other unit a prefixed value stands for.

Base unit (no prefix) in other units
Base unit (no prefix)	Giga	Mega	Kilo
1 ×1	= 1e-9 G	= 0.000001 M	= 0.001 k
10 ×1	= 1e-8 G	= 0.00001 M	= 0.01 k
100 ×1	= 1e-7 G	= 0.0001 M	= 0.1 k
1000 ×1	= 0.000001 G	= 0.001 M	= 1 k

The next smaller si prefixes unit is the deci unit (d). 1 ×1 = 10 d, and 1 d = 0.1 ×1.

The next larger si prefixes unit is the deca unit (da). 1 ×1 = 0.1 da, and 1 da = 10 ×1.

How many giga units are in one base unit?: One base unit = 1e-9 G (giga units).
How many mega units are in one base unit?: One base unit = 0.000001 M (mega units).
How many kilo units are in one base unit?: One base unit = 0.001 k (kilo units).