About Electronic Music Mall

What this site is

Electronic Music Mall is a small set of free calculators built around the numbers producers and DJs actually look up mid-session — tempo, delay time, MIDI note frequency, sample rate and bit depth, file size, and harmonic key. There is also a museum of the synths and drum machines that shaped the genre. That is the whole site.

The tools

• BPM Tempo Calculator — turns a tempo into the millisecond length of a beat, a bar, and every note value.
• Delay Time Calculator — the same tempo math, aimed at straight, dotted, and triplet delay times in milliseconds and Hz.
• MIDI Note Frequency Converter — converts between MIDI note numbers, note names, and frequency in Hz, with an adjustable A4 reference.
• Sample Rate & Bit Depth Calculator — works out uncompressed PCM data rate and file size from sample rate, bit depth, channel count, and duration.
• Audio File Size Calculator — estimates a file’s size from either uncompressed PCM settings or a compressed bitrate and duration.
• DJ Mix Harmonic Key Calculator — takes a track’s Camelot code and lists every harmonically compatible key.

How they work

Each calculator runs a fixed formula — tempo-to-milliseconds, MIDI number to Hz, PCM bytes-per-second, Camelot wheel adjacency — client side, in your browser. There is no account, no saved history, and no server round-trip to compute a result.

Where the numbers come from

The math is standard audio-engineering arithmetic, not a proprietary model: the equal-tempered tuning formula for MIDI-to-frequency, plain multiplication for tempo-to-milliseconds and PCM data rate, and the published Camelot wheel mapping for key compatibility. None of it is original research — it is just wired up so you do not have to do the arithmetic by hand between takes.

The museum

The Iconic Synths & Drum Machines section is a separate, browsable timeline covering machines like the Minimoog, the Prophet-5, and the TB-303, plus the TR-808 and TR-909 drum machines. Every entry, image, and fact is pulled from Wikipedia and Wikimedia Commons, not written by us — treat it as a starting point for further reading, not a primary source.

Straight talk about ads & advice

This site is independent and pays for itself through advertising. We are not affiliated with Roland, Sequential, or any other instrument maker named on the site or in the museum, and we do not sell or endorse specific gear. Every calculator result is an estimate built on standard formulas and typical settings — your DAW, your interface, and your own ears are the final word, not us. Nothing here is professional audio-engineering advice.

Also on the site

Beyond the tools and the museum, the learn section and blog cover production technique, gear, and sound design in more depth. Questions or a tool acting up? Get in touch.