Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Maximum Sound Pressure Levels in Rooms

Maximum recommended sound pressure levels in rooms like kindergartens, auditoriums, libraries, cinemas and more.

Sound pressure level is the pressure of sound related to a fixed reference. The reference is the threshold of hearing 2 10-5 Pa, or in the logarithmic decibel scale the value 0 dB.

The table below can be used as a guide to maximum acceptable sound pressure levels in rooms with different types of activities.

Sound Pressure - Maximum Levels in Rooms
Activity and Type of AreaNoise Rating
NR value
Kindergartens 30 35
Auditorium 25 30
Library 30 35
Cinema 30 35
Concert hall 20 25
Court room 25 30
Theater 25 30
Store, retail 35 40
Supermarkets 40 45
Hospital, corridor 30 35
Hospital, operating theater 25 30
Hospital, private room 20 25
Hotel, lobby 35 40
Hotel, restaurant 40 45
Hotel, ballroom 30 35
Church 25 30
Office 30 35
School, lecture room 25 30
School, corridor 30 35
School, gymnasium 30 35
Swimming pool 35 40
Studio, record 20 25
Studio, radio 15 20
Studio, television with audience 25 30
Studio, television without audience 20 25

Related Topics

  • Acoustics

    Room acoustics and acoustic properties. decibel A, B and C calculations. Noise Rating (NR) curves. Sound transmission through walls. Calculate sound pressure, sound intensity and sound attenuation.
  • Noise and Attenuation

    Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems.
  • Physiology

    Human physiology vs. air quality, comfort temperatures, activity and metabolic rates. Health effects of gases adn polutions like carbon monoxide and more.

Related Documents


Search is the most efficient way to navigate the Engineering ToolBox.

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .


This page can be cited as

  • The Engineering ToolBox (2003). Maximum Sound Pressure Levels in Rooms . [online] Available at: [Accessed Day Month Year].

Modify the access date according your visit.

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter