SI Prefix Converter
Convert between metric prefixes from quetta down to quecto, including the four added in 2022.
Results
Result
1000
k
1 M equals 1000 k
What this tool does
Every SI prefix is just a power of ten, so moving from megawatts to kilowatts or from microseconds to nanoseconds is only a question of counting zeros — and counting zeros by hand is exactly where mistakes happen. This converter carries the full modern range, including ronna, quetta, ronto and quecto, which the General Conference on Weights and Measures added in November 2022 to cope with the size of the numbers that data storage and astronomy now produce.
Worked example
1 M 1000 k
Conversion table
| Unit | Result |
|---|---|
| Quetta Q | 1e-24 |
| Ronna R | 1e-21 |
| Yotta Y | 1e-18 |
| Zetta Z | 1e-15 |
| Exa E | 1e-12 |
| Peta P | 0.000000001 |
| Tera T | 0.000001 |
| Giga G | 0.001 |
| Kilo k | 1000 |
| Hecto h | 10,000 |
| Deca da | 100,000 |
| No prefix — | 1,000,000 |
| Deci d | 10,000,000 |
| Centi c | 100,000,000 |
| Milli m | 1,000,000,000 |
| Micro µ | 1,000,000,000,000 |
| Nano n | 1e+15 |
| Pico p | 1e+18 |
| Femto f | 1e+21 |
| Atto a | 1e+24 |
| Zepto z | 1e+27 |
| Yocto y | 1e+30 |
| Ronto r | 1e+33 |
| Quecto q | 1e+36 |
Convert a whole list
One value per line. The units above are used for every line.
Limitations
- The calculation runs at full precision and only the display is rounded. If you copy an intermediate value and retype it, small differences can appear.