RT60 Calculator for Sports Facilities: Reverberation Time Guide

RT60 is the single most important acoustic metric for indoor sports facilities. It tells you how long sound lingers in a space after the source stops — and if it's too high, it means your facility is louder, less comfortable, and potentially hazardous to hearing.

What Is RT60?

RT60 stands for Reverberation Time 60 — the time in seconds for sound to decay by 60 decibels. In a well-treated room, this happens quickly (under 2 seconds). In an untreated gymnasium or warehouse conversion, RT60 can exceed 5 seconds.

Why RT60 Matters for Sports

In sports facilities, excessive reverberation causes:

- Speech intelligibility drops below 50% (coaches can't be heard) - Cumulative noise exposure exceeds OSHA's 85 dB action level - Player fatigue increases from sustained noise stress - Referee communication becomes unreliable - Spectator experience degrades significantly

For pickleball specifically, the sharp impulse of paddle-on-ball contact generates peak sound levels of 85+ dB. In a reverberant space, these peaks stack on top of each other, creating a sustained noise level that's far higher than any single hit.

RT60 Targets by Facility Type

The ideal RT60 depends on what happens in the space:

- Pickleball facility (dedicated): 1.0–1.5 seconds - Multi-sport gymnasium: 1.2–1.8 seconds - Basketball/volleyball gym: 1.5–2.0 seconds - Converted warehouse/industrial: Target 1.5s (usually starts at 4.0–6.0s) - Community recreation center: 1.2–1.5 seconds

How to Calculate RT60

The Sabine equation provides a reliable estimate:

RT60 = 0.161 × V / A

Where: - V = Room volume in cubic meters (length × width × height) - A = Total absorption in metric sabins (sum of surface area × absorption coefficient for each material)

For rooms with very high absorption (treated facilities), the Eyring equation gives more accurate results, but Sabine is the standard starting point.

Example Calculation

A 12,000 sq ft facility with 28-foot ceilings: - Volume: 12,000 × 28 = 336,000 cu ft = 9,515 m³ - Untreated absorption (concrete, steel, wood floor): ~450 sabins - RT60 = 0.161 × 9,515 / 450 = 3.4 seconds

After adding SLN/CR Core panels to 20% of wall area (2,400 sq ft at NRC 1.05): - New absorption: 450 + 2,520 = 2,970 sabins - RT60 = 0.161 × 9,515 / 2,970 = 0.52 seconds

That's a reduction from "echo chamber" to "acoustically excellent."

Skip the Math — Use the Acoustic Snapshot

While the formula is straightforward, real-world facilities have irregular shapes, mixed materials, openings, and HVAC systems that complicate manual calculations. The SLN/CR Acoustic Snapshot tool handles all of this automatically.

Enter your room dimensions and surface materials, and get a professional RT60 estimate with treatment recommendations in under 5 minutes.

Start your free RT60 analysis at slncr.com/assessment