When setting a delay pedal or plugin, you need the delay time in milliseconds that matches your song tempo. A quarter-note delay at 120 BPM is 500ms. An eighth-note delay is 250ms. Dotted eighth note (common for the Edge-style U2 sound) is 375ms. This converter does all the math instantly.
The Hz row at the bottom shows the frequency equivalent — useful when configuring tremolo, vibrato, or LFO rates in synthesizers and modular gear. Need to verify the tempo first? Try the tap tempo tool or the BPM finder.