Song BPM & Key Finder
Find the BPM and musical key of any song instantly — free, private, no file uploads. Drop any audio file for on-device analysis right in your browser.
How Song Tempo and Key Detection Works
Three simple steps to find the BPM and key of any song
1. Upload Your Audio File
Drag and drop or click to upload any audio file. It supports MP3, WAV, FLAC, AAC, OGG, M4A and more.
2. Instant Browser Analysis
Our audio engine analyzes your file entirely inside your browser using advanced signal processing. No data is uploaded to any server.
3. View Detailed Results
Get accurate BPM, musical key, mood classification, energy level, loudness measurement, and danceability score in seconds.
Why Musicians Use This Tempo & Key Analyzer
Powerful, private, and completely free
100% Private
Your audio never leaves your device. All tempo and key detection is performed locally in your browser — no file uploads, no server processing, no data collection.
Lightning Fast
Powered by a WebAssembly audio engine, the analyzer returns tempo and key data in seconds — even for longer tracks. No waiting for server responses.
Multi-Parameter Analysis
Go beyond tempo. It also detects musical key and scale, mood classification, energy level, spectral brightness, dynamic range, and danceability.
DJ & Producer Friendly
Whether you're beatmatching, choosing the right key for a mashup, or organizing your music library, our tool gives you the data you need to mix and produce like a pro.
Works Everywhere
No installation needed. It works on any modern browser — desktop, tablet, or mobile. macOS, Windows, Linux, iOS, and Android are all supported.
Free, No Limits
Analyze as many tracks as you want. No sign-up, no daily caps, no premium tiers. The tool is free to use.
Who Uses AHA Music BPM & Key Finder?
Built for DJs, producers, musicians, and fitness professionals
DJs & Club Performers
Find the BPM and key of every track before your set. Beatmatch seamlessly and use key data for harmonic mixing on the Camelot Wheel. Build smooth-flowing sets that keep the dancefloor locked in.
Music Producers & Beat Makers
Identify the tempo and key of any sample before flipping it. Match your new beats to the original BPM. Ensure chord progressions and new elements stay in the same key as the source material.
Fitness Instructors & Coaches
Build workout playlists matched to training intensity. Warm-up tracks at 80–100 BPM, steady-state cardio at 120–140 BPM, HIIT intervals at 140–160 BPM. Verify any track's tempo in seconds.
Musicians & Music Students
Find the key of any song before learning it on guitar, piano, or any instrument. Transpose more easily knowing the original key. Practice improvisation in the correct scale over backing tracks.
What is BPM? Understanding Beats Per Minute
BPM (Beats Per Minute) is the standard measure of musical tempo — how many rhythmic beats occur in one minute. A slow ballad sits around 60–80 BPM; pop and dance music typically runs 100–130 BPM; drum and bass can exceed 170 BPM. Knowing a track's BPM is essential for DJs who need to beatmatch songs seamlessly, for fitness instructors building intensity-matched playlists, and for producers who want to remix or sample existing music at the right tempo.
What is Musical Key? How to Find the Key of a Song
A song's musical key defines the set of notes and chords used throughout the track. Most songs are in a major key (bright, happy sound) or a minor key (darker, emotional tone). DJs use key information for harmonic mixing — playing songs in compatible keys so transitions sound musical rather than clashing. Producers need to know the key before adding new instruments, vocals, or samples. Our key finder detects both the root note (C, D, E, F, G, A, B) and the mode (major or minor) using chromagram-based spectral analysis.
Camelot Wheel & Harmonic Mixing for DJs
The Camelot Wheel is the DJ standard for harmonic mixing. Each musical key is assigned a number (1–12) and a letter — A for minor, B for major. Keys with the same number, or adjacent numbers on the wheel, are harmonically compatible and will blend smoothly. For example, a track in A minor (8A on the Camelot Wheel) mixes perfectly with C major (8B), E minor (7A), or D minor (9A). After detecting your track's key with AHA Music, map it to a Camelot code to plan your sets and create flawless harmonic transitions.
BPM Ranges by Music Genre
Reference guide to typical tempo ranges across popular music styles
| Genre | Typical BPM Range |
|---|---|
| Ambient / Chill | 60–80 BPM |
| Hip-hop / R&B | 70–100 BPM |
| Pop | 100–130 BPM |
| House | 120–130 BPM |
| Techno | 130–145 BPM |
| Dubstep / Trap | 138–150 BPM |
| Latin / Reggaeton | 90–110 BPM |
| Drum & Bass | 160–180 BPM |
| Metal / Punk | 100–200+ BPM |
Tempo & Key Detection FAQ
Common questions about BPM detection and key finding
How accurate is the tempo detection?
Our tempo detection algorithm is highly accurate for most genres of music. It uses Percival's BPM estimation method, which performs well across electronic, pop, rock, hip-hop, and classical music. For tracks with complex time signatures, results may vary by ±1–2 BPM.
How does the key detection work?
The tool detects the musical key and scale (major or minor) of a song. It uses spectral analysis and chromagram-based algorithms to determine the tonal center — essential for harmonic mixing, mashups, and music production.
Is my audio uploaded to a server?
No. Your audio file is processed entirely in your browser using WebAssembly technology. Nothing is uploaded, transmitted, or stored on any server. Your audio stays 100% on your device.
What audio formats are supported?
The analyzer supports any audio format your browser can decode: MP3, WAV, FLAC, AAC, OGG, M4A, MP4, WebM, and more. File size limit is 50MB.
Can I use this tool for DJing?
Absolutely. DJs use tempo and key data to beatmatch tracks and keep harmonic mixes compatible between songs. This tool provides both, making it a strong companion for live sets and playlist preparation.
How is the mood detected?
Mood detection uses a combination of danceability scoring, spectral energy analysis, and dynamic range measurement. The algorithm classifies tracks into moods like High Energy, Groovy, Neutral, or Atmospheric — giving you a quick feel for the track's vibe.
Why do I get different BPM results compared to other tools?
Different BPM detectors may measure half-time or double-time tempos differently. For example, a 140 BPM track could be reported as 70 BPM by some tools. Our finder reports the most likely perceived tempo. The key detection algorithm is generally consistent across tools.
Do I need to create an account?
No. You can use the analyzer for free without any registration, login, or email. Just open the page and start analyzing.
What is the Camelot Wheel and how do I use key data for harmonic mixing?
The Camelot Wheel is a DJ system for harmonic mixing. Each key gets a number (1–12) and a letter (A = minor, B = major). Keys sharing the same number, or neighboring numbers, sound harmonically compatible. After detecting your song's key with AHA Music, map it to its Camelot code (e.g., A minor = 8A, C major = 8B) to find tracks that will transition smoothly in your DJ set.
What are typical BPM ranges for different music genres?
Typical BPM ranges by genre: Ambient/Chill 60–80 BPM, Hip-hop/R&B 70–100 BPM, Pop 100–130 BPM, House 120–130 BPM, Techno 130–145 BPM, Dubstep 138–142 BPM, Drum & Bass 160–180 BPM, Metal 100–200+ BPM. These are general ranges — sub-genres vary. Use our BPM finder to verify any track's exact tempo.
Why does the BPM show as double or half of what I expected?
Half-time and double-time detection is common. Some algorithms detect the rhythmic grid at twice or half the perceived tempo. A hip-hop track felt at 90 BPM may analyze as 180 BPM. If the result seems off, simply halve or double the displayed value. Our tool reports the most likely perceived tempo, but for complex rhythms you may need to adjust.
How do I find the key of a song from YouTube or Spotify?
To find the key of a YouTube or Spotify song: download the audio file first (check local copyright laws), then upload it to AHA Music BPM & Key Finder. The analyzer detects the musical key and BPM in seconds. For Spotify tracks, some third-party apps also expose key data from Spotify's audio features API.
Does this BPM finder work for live recordings and low-quality audio?
Yes — the analyzer processes any audio file your browser can decode, including live recordings, voice memos, and low-bitrate files. For key detection, cleaner recordings yield more accurate results. BPM detection is generally robust even with lower quality or slightly distorted audio.
Is this a BPM tapper / tap tempo tool?
No — this tool uses audio file analysis for accurate BPM detection, which is more precise than manual tapping. If you need tap tempo (tapping the beat by hand), use a dedicated BPM tapper. For detecting the BPM of a recorded track, upload-based analysis gives you an exact number without any manual counting.