Reference-Table-Imperial-Standard-Metric-Prefix
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| Unit Prefix | Base 10 (Order of Magnitude) |
Decimal Value (Base Multiplier) |
Ordinal Name (Short Scale System) |
Ordinal Name (Long Scale System) | |
|---|---|---|---|---|---|
| Name | Symbol | ||||
| (kiloquetta-) | (kQ-) | (1033) | (1 000 000 000 000 000 000 000 000 000 000 000) | (Decillion) | (Quintilliard (Thousand-Quintillion)) |
| quetta- | Q | 1030 | 1 000 000 000 000 000 000 000 000 000 000 | Nonillion | Quintillion |
| ronna- | R | 1027 | 1 000 000 000 000 000 000 000 000 000 | Octillion | Quadrilliard (Thousand-Quadrillion) |
| yotta- | Y | 1024 | 1 000 000 000 000 000 000 000 000 | Septillion | Quadrillion |
| zetta- | Z | 1021 | 1 000 000 000 000 000 000 000 | Sextillion | Trilliard (Thousand-Trillion) |
| exa- | E | 1018 | 1 000 000 000 000 000 000 | Quintillion | Trillion |
| peta- | P | 1015 | 1 000 000 000 000 000 | Quadrillion | Billiard (Thousand-Billion) |
| tera- | T | 1012 | 1 000 000 000 000 | Trillion | Billion |
| giga- | G | 109 | 1 000 000 000 | Billion | Milliard (Thousand-Million) |
| (hebdo-) | (H-) | (107) | (10 000 000) | (Ten-Million) | (Ten-Million) |
| mega- | M | 106 | 1 000 000 | Million | Million |
| (myria-) | (my-) | (104) | (10 000) | (Ten-Thousand) | (Ten-Thousand) |
| kilo- | k (K) | 103 | 1 000 | Thousand | Thousand |
| hecto- | h (H) | 102 | 100 | Hundred | Hundred |
| deca- | da (D) | 101 | 10 | Ten | Ten |
| — | — | 100 | 1 | (Units) | (Units) |
| deci- | d | 10−1 | 0.1 | Tenth | Tenth |
| centi- | c | 10−2 | 0.01 | Hundredth | Hundredth |
| milli- | m | 10−3 | 0.001 | Thousandth | Thousandth |
| (decimilli- ("dimi-")) | (dm-) | (10−4) | (0.0 001) | (Ten-Thousandth) | (Ten-Thousandth) |
| micro- | μ | 10−6 | 0.000 001 | Millionth | Millionth |
| (millimicro-) (micromilli-) |
(mμ) (μm) |
(10−9) | (0.000 000 001) | (Billionth) | (Thousand-Millionth) |
| nano- | n | 10−9 | 0.000 000 001 | Billionth | Thousand-Millionth |
| pico- | p | 10−12 | 0.000 000 000 001 | Trillionth | Billionth |
| (micri-) | (mc-) | (10−14) | (0.000 000 000 000 01) | (Hundred-Trillionth) | (Hundred-Billionth) |
| femto- | f | 10−15 | 0.000 000 000 000 001 | Quadrillionth | Thousand-Billionth |
| atto- | a | 10−18 | 0.000 000 000 000 000 001 | Quintillionth | Trillionth |
| zepto- | z | 10−21 | 0.000 000 000 000 000 000 001 | Sextillionth | Thousand-Trillionth |
| yocto- | y | 10−24 | 0.000 000 000 000 000 000 000 001 | Septillionth | Quadrillionth |
| ronto- | r | 10−27 | 0.000 000 000 000 000 000 000 000 001 | Octillionth | Thousand-Quadrillionth |
| quecto- | q | 10−30 | 0.000 000 000 000 000 000 000 000 000 001 | Nonillionth | Quintillionth |
| (milliquecto-) | (mq-) | (10−33) | (0.000 000 000 000 000 000 000 000 000 000 001) | (Decillionth) | (Thousand-Quintillionth) |
| * Prefixes in Grey Text are either unofficial or are prior prefixes that have since been discontinued but that still are occasionally encountered. | |||||