Tempo-Synced Delay & Reverb Time Calculator
Enter your song tempo to calculate exact delay times (ms), pre-delay, and musical reverb decay timing.
Common Delay Times at Current BPM
| Note Value | Milliseconds |
|---|
Why delay and reverb timing matters
Great mixes often feel “expensive” because time-based effects are working with the song, not against it. When delay repeats and reverb tails are synchronized to tempo, vocals stay clear, guitars sit in the groove, and transitions feel intentional rather than messy.
This calculator is built to speed up that process. Instead of guessing milliseconds by ear from scratch, you can get accurate starting points in seconds and milliseconds, then fine-tune by feel.
Core formulas used in this calculator
1) Beat length in milliseconds
Beat ms = 60000 ÷ BPM
At 120 BPM, one beat equals 500 ms.
2) Delay time for a note division
Delay ms = Beat ms × note multiplier
- Quarter note = 1 beat
- Eighth note = 0.5 beat
- Dotted eighth = 0.75 beat
- Triplets use two-thirds or one-third beat values
3) Reverb pre-delay and decay
Pre-delay separates dry sound from reverb onset for clarity. Syncing it to a short note value (like 1/32 or 1/16) keeps things musical.
Decay time (RT60-style estimate here) can be linked to a number of beats or bars so the tail exits in rhythm. This is especially useful on vocals, snare, and lead instruments.
How to use this calculator effectively
- Enter BPM from your DAW session.
- Select your delay note division (e.g., dotted 1/8 for rhythmic guitar).
- Set reverb pre-delay to keep transients clear.
- Choose target tail length in beats.
- Adjust room character to get tighter or bigger ambience.
After that, paste the ms values into your plugins and listen in context of the full mix.
Practical starting points
Vocals
- Delay: 1/8 or dotted 1/8
- Pre-delay: 1/32 to 1/16
- Decay: 1.2s to 2.4s (depending on genre and arrangement density)
Snare
- Delay: short slap 70–140 ms (or sync to 1/16)
- Pre-delay: 10–30 ms equivalent
- Decay: short to medium for punch, longer for ballads and cinematic styles
Synths and guitars
- Delay: sync to 1/8, dotted 1/8, or 1/4 triplet for movement
- Pre-delay: 1/32 often works well
- Decay: tie tail to phrase length so it clears before the next section
Common mistakes to avoid
- Ignoring BPM changes: if your song tempo changes, effect times must change too.
- Too much feedback: long delay tails can cloud vocal intelligibility.
- No high-pass/low-pass filtering: time effects can fill the mix with mud or harshness.
- Overly long decay: beautiful solo, blurry full mix.
Final mixing tip
Think of this calculator as a precision starting point, not a final decision engine. Start with mathematically clean values, then nudge times by ear a few milliseconds if needed. That hybrid approach—math first, taste second—usually delivers the most professional results.