dBu to dBFS
Type a value in dBu to get it in dBFS instantly.
-20dBFS
That's about the same as professional line level. That is about 1.228 volts RMS.
What it means
How hot is that signal?
dBFS depends on the converter’s alignment. The +4 dBu = −20 dBFS used here is the common broadcast standard; some studios align at −18 or −14.
The math
How to convert dBu to dBFS
The two references differ by 2.2 dB: dBu = dBV + 2.2. In volts, dBu = 20 × log₁₀(V ÷ 0.7746).
Example: 4 dBu = -20 dBFS.
Every unit
Your level in every unit
Tables
dBu to dBFS conversion table
| dBu | dBFS |
|---|---|
| -60 dBu | -84 dBFS |
| -40 dBu | -64 dBFS |
| -20 dBu | -44 dBFS |
| -10 dBu | -34 dBFS |
| -6 dBu | -30 dBFS |
| 0 dBu | -24 dBFS |
| 4 dBu | -20 dBFS |
| 10 dBu | -14 dBFS |
| 20 dBu | -4 dBFS |
| 24 dBu | 0 dBFS |
| 30 dBu | 6 dBFS |
dBFS to dBu conversion table
| dBFS | dBu |
|---|---|
| -60 dBFS | -36 dBu |
| -40 dBFS | -16 dBu |
| -20 dBFS | 4 dBu |
| -10 dBFS | 14 dBu |
| -6 dBFS | 18 dBu |
| 0 dBFS | 24 dBu |
| 4 dBFS | 28 dBu |
| 10 dBFS | 34 dBu |
| 20 dBFS | 44 dBu |
| 24 dBFS | 48 dBu |
| 30 dBFS | 54 dBu |
Quick answers
Quick answers
- How many dBFS is 1 dBu?
- 1 dBu is -23 dBFS.
- How many dBFS is 10 dBu?
- 10 dBu is -14 dBFS.
- How many dBFS is 4 dBu?
- 4 dBu is -20 dBFS.
The units
About these units
dBu (dBu)
Decibels against 0.7746 volts, the professional audio reference.
dBFS (dBFS)
Decibels below digital full scale, at the +4 dBu = −20 dBFS alignment.
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