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QUICK CALCULATOR / ENVIRONMENTAL ENGINEERING

Room acoustics & RT60

Compare frequency-dependent absorption and a statistical reverberation estimate before and after treatment.

Open room workspace

Save, load & project settings

Project nameLength entry units

Engineering inputs

Start here: RT60 at the frequency bands you supply

* Required for this basic result. Optional fields add other results. Only enter known values.

What else may be needed?

Supply net areas for all room surfaces and coefficients for at least one frequency band. Starting a band makes that coefficient required in every surface row; other bands remain optional. Include all relevant surfaces, not just one sample material.

Target RT60 and treatment coefficients are only needed for treatment comparisons.

Still to enter: Room volume override (quick mode); Sabine model; Surface materials: at least 1 row; Surface coefficients for at least one frequency band.

Room volume override (quick mode) (m³)Target RT60 (s) (optional)Sabine modelStatistical diffuse-field approximation. Enter net surfaces; subtract doors and windows from walls.Treatment absorption coefficient (optional)Replaced material absorption coefficient (optional)125 Hz optional object absorption (m² sabin) (optional)250 Hz optional object absorption (m² sabin) (optional)500 Hz optional object absorption (m² sabin) (optional)1000 Hz optional object absorption (m² sabin) (optional)2000 Hz optional object absorption (m² sabin) (optional)4000 Hz optional object absorption (m² sabin) (optional)

Surface materials *

Use manufacturer or measured coefficients for the stated mounting condition. Window/door areas must not also be counted as wall.

Source and measurement conditions (optional)

Simulation

REV 0

Quick calculator

Independent calculations with only the inputs they need. Use the room workspace for seats, obstructions and synchronized views.

Frequency-dependent RT60

Method & limitations

Sabine T = 0.161 V / A in SI units. Requires suitable diffuse-field conditions; not a measured room response.

View reference register

Calculation geometry

Enter the required geometry or measurements to draw this calculation. No sample dimensions are assumed.

Calculation geometry

Enter the required geometry or measurements to draw this calculation. No sample dimensions are assumed.

Calculation geometry

Enter the required geometry or measurements to draw this calculation. No sample dimensions are assumed.

Calculation geometry

Enter the required geometry or measurements to draw this calculation. No sample dimensions are assumed.

Calculation geometry

Enter the required geometry or measurements to draw this calculation. No sample dimensions are assumed.

Calculation geometry

Enter the required geometry or measurements to draw this calculation. No sample dimensions are assumed.

Rack front elevation

Enter the required geometry or measurements to draw this calculation. No sample dimensions are assumed.

Frequency-dependent RT60

Calculation geometry

Enter the required geometry or measurements to draw this calculation. No sample dimensions are assumed.

TAKE YOUR THINKING FURTHER

A report you can discuss.

Inputs, calculation basis, diagrams and limitations — kept together in a local PDF.

Report page size

Combined project report

Includes results and inputs for selected tools, plus available diagrams for those tools and the current room view. All values use the same project revision.

Calculation results

Preliminary engineering. Review the basis before using a value.

125 Hz equivalent absorption

Additional Input Required

— m² sabin

Use net areas after subtracting doors/windows. Object absorption included only when explicitly entered.

125 Hz estimated RT60

Additional Input Required

— s

0.161 SI coefficient; diffuse-field approximation, not an on-site measurement.

125 Hz additional absorption

Additional Input Required

— m² sabin

Required increment, not gross treatment material area.

125 Hz replacement treatment area

Additional Input Required

— m²

Uses new minus replaced old coefficient. Enter coefficients applicable to this comparison; verify available area.

250 Hz equivalent absorption

Additional Input Required

— m² sabin

Use net areas after subtracting doors/windows. Object absorption included only when explicitly entered.

250 Hz estimated RT60

Additional Input Required

— s

0.161 SI coefficient; diffuse-field approximation, not an on-site measurement.

250 Hz additional absorption

Additional Input Required

— m² sabin

Required increment, not gross treatment material area.

250 Hz replacement treatment area

Additional Input Required

— m²

Uses new minus replaced old coefficient. Enter coefficients applicable to this comparison; verify available area.

500 Hz equivalent absorption

Additional Input Required

— m² sabin

Use net areas after subtracting doors/windows. Object absorption included only when explicitly entered.

500 Hz estimated RT60

Additional Input Required

— s

0.161 SI coefficient; diffuse-field approximation, not an on-site measurement.

500 Hz additional absorption

Additional Input Required

— m² sabin

Required increment, not gross treatment material area.

500 Hz replacement treatment area

Additional Input Required

— m²

Uses new minus replaced old coefficient. Enter coefficients applicable to this comparison; verify available area.

1000 Hz equivalent absorption

Additional Input Required

— m² sabin

Use net areas after subtracting doors/windows. Object absorption included only when explicitly entered.

1000 Hz estimated RT60

Additional Input Required

— s

0.161 SI coefficient; diffuse-field approximation, not an on-site measurement.

1000 Hz additional absorption

Additional Input Required

— m² sabin

Required increment, not gross treatment material area.

1000 Hz replacement treatment area

Additional Input Required

— m²

Uses new minus replaced old coefficient. Enter coefficients applicable to this comparison; verify available area.

2000 Hz equivalent absorption

Additional Input Required

— m² sabin

Use net areas after subtracting doors/windows. Object absorption included only when explicitly entered.

2000 Hz estimated RT60

Additional Input Required

— s

0.161 SI coefficient; diffuse-field approximation, not an on-site measurement.

2000 Hz additional absorption

Additional Input Required

— m² sabin

Required increment, not gross treatment material area.

2000 Hz replacement treatment area

Additional Input Required

— m²

Uses new minus replaced old coefficient. Enter coefficients applicable to this comparison; verify available area.

4000 Hz equivalent absorption

Additional Input Required

— m² sabin

Use net areas after subtracting doors/windows. Object absorption included only when explicitly entered.

4000 Hz estimated RT60

Additional Input Required

— s

0.161 SI coefficient; diffuse-field approximation, not an on-site measurement.

4000 Hz additional absorption

Additional Input Required

— m² sabin

Required increment, not gross treatment material area.

4000 Hz replacement treatment area

Additional Input Required

— m²

Uses new minus replaced old coefficient. Enter coefficients applicable to this comparison; verify available area.