What is an SI prefix?

An SI prefix is a multiplier placed before a unit to scale it by a power of ten, such as kilo (1000x) in kilogram or milli (0.001x) in millimeter. The full set runs from quetta (10^30) down to quecto (10^-30).

What are the newest SI prefixes?

Ronna (R, 10^27), quetta (Q, 10^30), ronto (r, 10^-27), and quecto (q, 10^-30) were added by the General Conference on Weights and Measures (CGPM) in 2022.

Is the symbol for kilo uppercase or lowercase?

Lowercase k. Prefixes for a million (M) and larger use uppercase symbols, while kilo (k), hecto (h), and deca (da) and all sub-unit prefixes use lowercase. Note mega is M but milli is m.

How do I convert 4700 microfarads to millifarads?

Divide by 1000 because milli is 1000 times larger than micro: 4700 uF = 4.7 mF = 0.0047 F. Shifting from micro (10^-6) to milli (10^-3) moves the decimal point three places.

What is the difference between SI prefixes and binary prefixes?

SI prefixes are powers of ten (kilo = 1000), while binary prefixes such as kibi (Ki = 1024), mebi (Mi), and gibi (Gi) are powers of two. Binary prefixes (IEC 60027-2) avoid the ambiguity of using kilo or mega for 1024-based memory sizes.

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Reference

SI Prefixes Metric

Every SI metric prefix from quetta (10³⁰) to quecto (10⁻³⁰) with symbol, name, power of ten, and factor. Convert a value between prefixes and compare with binary prefixes.

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