Relative luminance from RGB
Relative luminance from RGB: enter R, G, B and get an instant result in your browser. Free, private, no account.
Relative luminance from RGB applies 0.2126 * r + 0.7152 * g + 0.0722 * b to the values you enter (R, G, B). Use it for quick color estimates from your own numbers—not for regulated engineering, tax filing, or clinical decisions. Everything runs in your browser; nothing is uploaded to our servers.
How to use
- Open Relative luminance from RGB and read the field labels (R, G, B).
- Replace defaults with figures from your spreadsheet, lab sheet, or quote.
- Press Calculate and note the output before changing another input.
- Bookmark this page if you reuse the same calculation often.
FAQ
Which numbers belong in Relative luminance from RGB?
Only the on-page labels: R, G, B. The tool does not guess hidden assumptions.
How does Relative luminance from RGB compute its result?
It evaluates 0.2126 * r + 0.7152 * g + 0.0722 * b. If your source uses different symbols, map them to these fields first.
Can I paste the Relative luminance from RGB result into Excel or Sheets?
Yes—copy the number and keep your own documentation of inputs for audit trails.
Is Relative luminance from RGB a substitute for professional color software?
No. It is a lightweight browser helper for one relationship; use certified tools for compliance work.