Decibel Calculator
Convert between decibels, intensity ratios, and power ratios — or look up common sound levels on the reference table.
Conversion Mode
Select what you know, enter the value, and get all related quantities.
Results
Enter a value and click Calculate.
Decibels
—
dB
Power Ratio
—
P2 / P1
Intensity Ratio
—
A2 / A1
Formula used:
Common Sound Levels
| Source | Level (dB) |
|---|
Summary
Convert between decibels, intensity ratios, and power ratios — or look up common sound levels on the reference table.
How it works
- Choose a conversion mode: dB to ratio, intensity ratio to dB, or power ratio to dB.
- Enter the known value in the input field.
- Click Calculate (or press Enter) to see all related values.
- Use the reference table at the bottom to understand real-world dB levels.
- Clear the inputs with the Reset button and try another value.
Use cases
- Convert a measured dB level to a physical intensity ratio.
- Determine how many decibels correspond to doubling the sound power.
- Understand the logarithmic scale of everyday sounds.
- Check amplifier gain expressed in dB against a linear power ratio.
- Compare two sound sources and find the dB difference.
- Quickly look up the dB level of common noise sources.
Frequently Asked Questions
Last updated: 2026-06-15 ·
Reviewed by Nham Vu