SI prefixes
NOTE: in order to make units values clearer, the SI system allows the presentation of unit’s values by the
appropriate prefix. For example, the value of watt can be replaced by the more common value of kilowatt [kW] or megawatt [MW].
| yotta | [Y] | 1 000 000 000 000 000 000 000 000 | = 1E + 24 |
| zetta | [Z] | 1 000 000 000 000 000 000 000 | = 1E + 21 |
| exa | [E] | 1 000 000 000 000 000 000 | = 1E + 18 |
| peta | [P] | 1 000 000 000 000 000 | = 1E + 15 |
| tera | [T] | 1 000 000 000 000 | = 1E + 12 |
| giga | [G] | 1 000 000 000(a billion) | = 1E + 9 |
| mega | [M] | 1 000 000(a million) | = 1E + 6 |
| kilo | [k] | 1 000(a thousand) | = 1E + 3 |
| hecto | [h] | 100(a hundred) | = 1E + 2 |
| deca | [da] | 10(ten) | = 1E + 1 |
| - | - | 1(one) | = 1E + 0 |
| deci | [d] | 0.1(a tenth) | = 1E − 1 |
| centi | [c] | 0.01(a hundredth) | = 1E − 2 |
| milli | [m] | 0.001(a tousandth) | = 1E − 3 |
| micro | [mi] | 0.000 001(a millionth) | = 1E − 6 |
| nano | [n] | 0.000 000 001(a billionth) | = 1E − 9 |
| pico | [p] | 0.000 000 000 001 | = 1E − 12 |
| femto | [f] | 0.000 000 000 000 001 | = 1E − 15 |
| atto | [a] | 0.000 000 000 000 000 001 | = 1E − 18 |
| zepto | [z] | 0.000 000 000 000 000 000 001 | = 1E − 21 |
| yocto | [y] | 0.000 000 000 000 000 000 000 001 | = 1E − 24 |