Meeting rooms fall under DIN 18041 room group A: the target value depends on the volume, every octave band has to stay inside the tolerance band. The calculator starts with 105 m³ (Meeting, conference or convention room), target value 0.48 s (0.38 to 0.57), and suggests the area needed from 2,004 products with measured data. Video conferencing has a shorter target value.
Target values by standard
Target values for meeting and conference rooms in three room sizes. The target value applies as the average of 500 and 1,000 Hz.
| Standard | Use | 60 m³ | 100 m³ | 200 m³ |
|---|---|---|---|---|
| DIN 18041, group ADIN 18041:2016-03 | Meeting, conference or convention room (A3) | 0.40 s (0.32 to 0.48) | 0.47 s (0.38 to 0.56) | 0.57 s (0.45 to 0.68) |
| OIB guideline 5OIB-Richtlinie 5:2023-05 | Classroom, meeting room, media room (Kommunikation) | 0.40 s (0.32 to 0.48) | 0.47 s (0.38 to 0.56) | 0.57 s (0.45 to 0.68) |
| BB93, schoolsBuilding Bulletin 93 (2015) | Meeting or video-conference room | at most 0.80 s | at most 0.80 s | at most 0.80 s |
| SS 25268, offices (Sweden)SS 25268:2023 | Meeting and conference room (by volume) | at most 0.50 s | at most 0.50 s | at most 0.50 s |
| BR18, schools, day care, offices (Denmark)BR18 (2018) mit Vejledning om lydforhold | Single office, meeting room (SBi 216) | at most 0.60 s | at most 0.60 s | at most 0.60 s |
| SFS 5907, classes A1 and A2 (Finland)SFS 5907:2022 | Meeting or retreat room (A2) | 0.60 s (0.50 to 0.70) | 0.60 s (0.50 to 0.70) | 0.60 s (0.50 to 0.70) |
| NBN S 01-400-2, schools (Belgium)NBN S 01-400-2:2012 | Office, staff room, meeting room | at most 1.00 s | at most 1.00 s | at most 1.00 s |
| PN-B-02151-4, reverberation and speech intelligibility (Poland)PN-B-02151-4:2015-06 | Conference room, courtroom, auditorium (by volume) | at most 0.80 s | at most 0.80 s | at most 0.80 s |
| LEED v4, acoustic performanceLEED v4 / v4.1 EQ Credit: Acoustic Performance | Conference or teleconference room | at most 0.60 s | at most 0.60 s | at most 0.60 s |
Typical measures
- Acoustic ceiling or one large ceiling raft above the table.
- Wall absorbers on the end wall behind the display and on one long wall.
- For video conferencing, absorbers near the camera and microphone.
- Curtains in front of glass help at high frequencies, the low frequencies need thick absorbers.
Ceiling rafts and wall absorbers with measured data
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Frequently asked questions
What reverberation time does a meeting room need?
Under DIN 18041 volume-dependent, for around 100 m³ about 0.5 s, averaged over 500 and 1,000 Hz, with a tolerance band of plus or minus 20 percent between 250 and 2,000 Hz.
Does a different value apply to video conference rooms?
Yes, DIN 18041 lists video conferencing as its own use with a shorter target value, because microphones pick up reverberation more strongly than the ear. Switch the use in the calculator.
How many absorbers does a room of 100 m³ need?
Around 15 to 25 m² of equivalent absorption area in addition to carpet and furniture, so one ceiling raft over half the ceiling or a covered end wall plus a smaller raft.
Other room types
Formulas, DIN 18041 and worked example on the calculator page