Skip to content

Reverb Time Calculator

Calculate RT60 room reverb time using the Sabine equation. Estimate acoustic treatment needed for studio and live room design.

Use this result well

Inputs that matter
Room Length, Room Width, Room Height, Floor Material, and 1 more
Output to expect
RT60 Reverb Time (Sabine)
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
Was this tool helpful?

Related Tools

Tools you might need next

Studio Acoustic Calculator

Calculate room acoustic modes and standing wave frequencies from room dimensions. Identify problematic bass frequencies for studio treatment.

Recommended next stepMusic Production
Delay Time Calculator

Calculate delay time in milliseconds from BPM for rhythmic delay effects. Quarter, eighth, dotted, and triplet note delay values.

Recommended next stepMusic Production
0–60 Run Record Calculator

Reconcile one completed 0–60 mph or separate 0–100 km/h source run from recorded threshold timestamps, with explicit time-zero, method and condition evidence.

Automotive

Reference & details

How it works

Sabine Equation

V is room volume, A is total absorption in sabins (surface area × absorption coefficient summed for all surfaces). Metric: RT60 = 0.161 × V / A (V in m³).

RT60 = 0.049 × V ÷ A (V in ft³, A in sabins)

Total Absorption

Calculate each surface (walls, floor, ceiling) area multiplied by material absorption coefficient at target frequency. Sum all surfaces.

A = Σ (Surface area × Absorption coefficient)

Target RT60 by Room Type

Different spaces need different reverb times. Dead spaces for recording vocals; livelier rooms for drums and orchestral recording.

Control room: 0.3–0.4s | Live room: 0.8–1.5s | Vocal booth: 0.1–0.3s

Updated: July 2026

Example Scenarios

1440 ft³ untreated RT60 ≈ 0.8s. Adding carpet, curtains, and 4 bass traps targets 0.35s for mixing accuracy.

400 ft³ room with wood floors and drywall at 0.6s RT60 — add reflective diffusion panels rather than absorption to maintain liveness.

64 ft³ booth needs heavy absorption (foam, fiberglass) to achieve 0.15s RT60 for dry vocal capture.

FAQ

Reverberation time — duration for sound to decay 60 dB after the source stops. Measured in seconds. Shorter RT60 = deader room; longer = more reverberant.

ITU-R BS.1116 recommends 0.2–0.5 seconds for control rooms depending on size. Smaller rooms target lower RT60. Even decay across frequencies matters.

Values 0–1 indicating how much sound a material absorbs at a given frequency. Concrete: 0.02. Carpet: 0.3. Acoustic foam: 0.7 at mid-high frequencies.

Sabine is accurate for moderately absorptive rooms with diffuse sound fields. Very dead or very live rooms may need Eyring or measured RT60 for precision.

Use RT60 measurement apps with calibrated microphone, or clap test (rough estimate). Professional acoustic consultants use impulse response analysis for precise results.

About Reverb Time Calculator

RT60 is the time for sound to decay 60 dB in an enclosed space — the standard measure of reverberation. Enter room dimensions and surface absorption coefficients to calculate RT60 using the Sabine equation and identify treatment needs.