SI Prefix Converter
One number, every magnitude form at a glance — k / M / m / µ / n.
What it does: Convert a number across all SI prefixes and get scientific / engineering notation.
When to use it: When reading datasheets, converting component markings, or normalizing unit magnitudes.
| Prefix | Form |
|---|
MEANS All these forms of the same quantity are equal; the most natural one to read is the row where the value falls between 1 and 999.
No history yet. Each calculation is automatically saved to this device.
How to use the SI prefix converter
Enter a value + pick the current prefix.
- 01
Enter a value
Type a number, e.g.
4700,0.0047,1.5. - 02
Pick the current prefix
Tell the tool what magnitude the number is right now: base unit, k, M, m, µ, n…
- 03
Read every prefix form
The same quantity is listed live under all SI prefixes — pick whichever reads cleanest (engineers usually take the row where the value sits between 1 and 999).
SI prefix reference
The most-used range in electronics: from T (tera) down to f (femto).
| Prefix | Symbol | Multiplier |
|---|---|---|
| tera | T | ×10^12 |
| giga | G | ×10^9 |
| mega | M | ×10^6 |
| kilo | k | ×10^3 |
| base unit | — | ×1 |
| milli | m | ×10^-3 |
| micro | µ | ×10^-6 |
| nano | n | ×10^-9 |
| pico | p | ×10^-12 |
| femto | f | ×10^-15 |
SI prefixes (International System of Units).
Common questions, answered in 3 minutes
Is 1k actually 1000 or 1024?
In electronics/physics k = 1000 (the SI prefix). 1024 is Ki (kibi) used in computer storage — a different thing; this tool uses the SI 1000.
What if I can't type µ?
Use u in place of µ (e.g. 1uF = 1µF); every tool on this site accepts u in its inputs. This conversion table displays the standard symbol µ.
Why do engineers prefer k/M/µ over scientific notation?
Prefixes step exactly every three orders of magnitude, lining up with component markings and meter readings, so they're easier to read and write — this is called engineering notation.
Does this converter understand units?
It's pure magnitude conversion and applies to Ω, F, H, Hz, V, A, s alike — choosing a unit only affects the display, not the value.
Standards and sources referenced by this tool
| Item | Value / Formula | Source |
|---|---|---|
| SI prefixes | T G M k (·) m µ n p f | BIPM SI prefixes |
Pure magnitude conversion, no external API.