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Engineering ToolBox > Prefix Names of Multiples and Submultiples of Units
| Prefix | Measure | Decimal equivalent | Exponential expression |
| Alto | one-quintillionth | 0.000 000 000 000 000 001 | E-18 |
| Femto | one-quadrillionth | 0.000 000 000 000 001 | E-15 |
| p - pico | one-trillionth | 0.000 000 000 001 | E-12 |
| n - nano | one-billionth | 0.000 000 001 | E-9 |
| μ - micro | one-millionth | 0.000 001 | E-6 |
| m - milli | one-thousandth | 0.001 | E-3 |
| Centi | one-hundredth | 0.01 | E-2 |
| Deci | one-tenth | 0.1 | E-1 |
| Uni | one | 1 | E0 |
| Deka | ten | 10.0 | E1 |
| Hecto | one hundred | 100.0 | E2 |
| k - kilo | one thousand | 1 000.0 | E3 |
| M - Mega | one million | 1 000 000.0 | E6 |
| G - Giga | one billion | 1 000 000 000.0 | E9 |
| T - Tera | one trillion | 1 000 000 000 000.0 | E12 |