Rw to percent transmitted
Type a value in Rw to get it in % instantly.
0.001%
That's 3.2× as quiet as a blockwork wall, while a party wall is 2× better. A 75 dB television next door would come through at about 25 dB.
What it means
How much sound gets through?
STC and Rw use different weighting curves, so the one-decibel offset is a good rule of thumb, not an exact conversion. Both ignore low bass, where walls perform worst.
The math
How to convert Rw to %
The rating is a logarithm of what gets through: dB = −10 × log₁₀(transmitted fraction). STC runs about one decibel above Rw for ordinary partitions.
Example: 50 Rw = 0.001 %.
Every unit
Your rating in every unit
Tables
Rw to % conversion table
| Rw | % |
|---|---|
| 20 Rw | 1 % |
| 25 Rw | 0.316228 % |
| 30 Rw | 0.1 % |
| 35 Rw | 0.0316228 % |
| 40 Rw | 0.01 % |
| 45 Rw | 0.00316228 % |
| 50 Rw | 0.001 % |
| 55 Rw | 0.000316228 % |
| 60 Rw | 1×10⁻⁴ % |
| 65 Rw | 3.162×10⁻⁵ % |
| 70 Rw | 1×10⁻⁵ % |
% to Rw conversion table
| % | Rw |
|---|---|
| 20 % | 6.9897 Rw |
| 25 % | 6.0206 Rw |
| 30 % | 5.22879 Rw |
| 35 % | 4.55932 Rw |
| 40 % | 3.9794 Rw |
| 45 % | 3.46787 Rw |
| 50 % | 3.0103 Rw |
| 55 % | 2.59637 Rw |
| 60 % | 2.21849 Rw |
| 65 % | 1.87087 Rw |
| 70 % | 1.54902 Rw |
Quick answers
Quick answers
- How many % is 1 Rw?
- 1 Rw is 79.4328 %.
- How many % is 10 Rw?
- 10 Rw is 10 %.
- How many % is 50 Rw?
- 50 Rw is 0.001 %.
The units
About these units
Rw (Rw)
The international weighted sound reduction index, in decibels.
Percent transmitted (%)
The same fraction as a percentage.
Keep going