Audio Delay Calculator
Calculate delay from distance, estimate distance from delay time, or sync delay to song BPM.
What is an audio delay calculator?
An audio delay calculator helps you align sound in time. In practical terms, it answers questions like: “How many milliseconds should I delay my rear speakers?” or “At 128 BPM, what delay time matches a dotted eighth-note echo?” This is useful for live sound, studio mixing, podcast production, home theater setup, and AV installations.
How the calculator works
1) Distance to delay time
Sound takes time to travel. If you know the distance between two speaker positions, you can calculate the delay needed to make arrivals line up at the listener. The calculator uses the speed of sound adjusted by temperature:
- Speed of sound (m/s) = 331.3 + (0.606 × temperature in °C)
- Delay (ms) = distance (m) ÷ speed (m/s) × 1000
At around 20°C, sound travels close to 343 m/s. A 10-meter spacing is roughly 29.15 ms of delay.
2) Delay time to distance
If you measure delay first—maybe from an impulse response or system analyzer—you can convert that time back into physical distance. This is handy for diagnosing setup errors or checking whether acoustic timing matches your physical layout.
3) BPM to musical delay
For creative effects, delay is often synchronized to song tempo. The quarter-note duration in milliseconds is:
- Quarter note (ms) = 60000 ÷ BPM
From there, other note values are simple multiples (e.g., eighth note = half of a quarter note, dotted quarter = 1.5× quarter note).
Where this is useful
- Live sound: Align main PA with delay towers, under-balcony fills, and front fills.
- Home theater: Set speaker distance/delay so dialogue remains focused and coherent.
- Studio mixing: Tempo-sync delay plugins to avoid muddy repeats and improve groove.
- Broadcast/podcasting: Match audio timing to video paths when latency differs.
- Install AV systems: Keep distributed loudspeakers phase-consistent and intelligible.
Practical tips for better results
Measure from acoustic sources, not cabinet edges
Speaker enclosures vary; measure from the likely acoustic center or use measurement software to fine-tune.
Use real room conditions
Temperature changes the speed of sound enough to matter in larger spaces. Enter a realistic temperature value when precision is important.
Verify with your ears and tools
Calculated values are excellent starting points, but final tuning should combine listening tests with measurement tools (RTA, impulse response, transfer function).
Quick FAQ
Does humidity matter?
Yes, but temperature has a bigger effect in most practical scenarios. This calculator focuses on temperature for simplicity and speed.
What sample rate should I use?
Use your session or processor sample rate (e.g., 44.1 kHz, 48 kHz, 96 kHz). The calculator converts milliseconds into samples so you can enter exact values in DAWs and DSP hardware.
Should I use round-trip mode?
Use round-trip options when your measured time includes a return path (for example, echo timing from a reflected impulse). For normal speaker-to-listener alignment, use one-way timing.