Generate SI Prefixes
Create a list of metric prefixes. Runs entirely in your browser, so your data never leaves your device.
Output
The result appears here as you type.
How to use Generate SI Prefixes
- 1. Choose the sort order. Select Largest first to list from quetta down to quecto, or Smallest first to start from the tiniest prefix and work up to the largest.
- 2. Decide whether to show symbols. Turn on Include symbol to append each prefix's abbreviation like Q or R alongside its full name, useful when you need the shorthand rather than the spelled-out word.
- 3. Read the full list. The output lists every SI metric prefix along with its power-of-ten value, from quetta at 10^30 down through milli, micro and beyond.
- 4. Copy the list. Copy the SI prefixes into a physics reference sheet, a units conversion script or documentation that needs the full metric scale.
When to use Generate SI Prefixes
Generate SI Prefixes lists every metric prefix from quetta to quecto along with its power-of-ten value and optional symbol, including the newer 2022-adopted extremes that many older references omit. Use this tool as a quick reference instead of hunting through a physics textbook or an outdated table.
- Building a units conversion reference table. A scientific computing library documenting supported unit prefixes needs the complete current list including quetta and ronna, added in 2022, alongside their power-of-ten values and symbols.
- Checking an unfamiliar prefix while reading a paper. A reader comes across zepto or yocto in a physics paper and wants to quickly confirm the exact power of ten it represents without digging through a full SI brochure.
- Teaching orders of magnitude in a science class. A physics lesson on scale, from the atomic to the astronomical, hands students the full ordered list of prefixes with symbols to anchor the discussion.
Examples
Largest prefixes first
Output
quetta (Q) = 10^30 ronna (R) = 10^27 yotta (Y) = 10^24
Smallest first, names only
Output
quecto = 10^-30 ronto = 10^-27 yocto = 10^-24
About the Generate SI Prefixes tool
Generate SI Prefixes is a free online tool that works entirely inside your web browser. Create a list of metric prefixes. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 194 Number utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
You can shape the output with 2 settings, including Order and Include symbol, and the result refreshes the moment you change one. 2 worked examples further down the page show exactly what the tool produces for real inputs.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Does Generate SI Prefixes cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Does the generator send anything to a server?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How do I get a different result?
Run the generator again. Each run is computed fresh on your device, and any options you change are applied to the next result immediately.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.