Rechner für RT60 & Nachhallzeit

How to use it: enter internal room dimensions and estimated total absorption at the frequency band of interest. Set a target to estimate how much absorption that target requires.

Formula. Sabine RT60 = 0.161 x room volume / total absorption.

Example. A 62.4 m3 room with 35 sabins has an estimated RT60 of 0.29 seconds.

The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.

Room length

5.5 m

Room width

4.2 m

Room height

2.7 m

Total absorption

35 sabins

Target RT60

0.4 s

Primary result: Estimated RT60: 0.29 s.

• Measure from the datum or reference edge described by this tool, and do not mix inside, outside and centerline dimensions.
• Keep inputs in the displayed units and preserve more precision than the final cutting or purchasing tolerance requires.
• When the result is close to a limit, verify it with a test piece, field measurement, manufacturer drawing or qualified project professional.

Sabine assumes a diffuse sound field and reasonably even absorption. Small rooms, sparse treatment, low frequencies and highly absorptive rooms can depart substantially. Use band-specific material data and confirm with a calibrated decay measurement.