Frequency Chart
Brainwave Bands
Reference
Here is the complete frequency chart you can bookmark, screenshot, or print. The "use" column reflects what the research and practice community actually reach for; the "evidence" column is our honest read of how strong the backing is.
| Band | Hz range | Typical beat example | Common use | Evidence strength |
|---|---|---|---|---|
| Delta | 0.5–4 | 3 Hz | Deep slow-wave sleep, overnight relaxation, physical recovery | Moderate for sleep onset & deep sleep; weak for the rest |
| Theta | 4–8 | 6 Hz | Light sleep, meditation, hypnagogia, creativity, visualization | Moderate for relaxation; mixed for creativity (individual-dependent) |
| Alpha | 8–12 | 10 Hz | Relaxed wakefulness, pre-sleep wind-down, calm focus | Strongest for anxiety/relaxation (meta-analysis d≈0.45) |
| Beta | 14–30 | 20 Hz | Alert concentration, analytical work, exam study | Weak to mixed; some attention benefits in small studies |
| Gamma | 30–100 | 40 Hz | Peak focus, memory binding, high-intensity cognitive tasks | Mixed: some narrowing of attention, but 2023 trial found no benefit |
Delta is the slowest and largest brainwave, dominant in the deepest stage of non-REM sleep. A study using a 3 Hz delta binaural beat reported induced delta activity and lengthened stage-three slow-wave sleep — the stage most tied to feeling refreshed. A separate study of soccer players listening to 2–8 Hz beats reported better perceived sleep quality and easier waking. For most people delta is the right band for an overnight loop or the last stretch of a sleep session.
Practical note: because delta beats sit right at the sleep threshold, many people drift off before noticing any "effect." That is exactly the point — the goal is to fall asleep, not to observe the frequency. Keep the volume low and let a fade-out timer do the rest.
Theta dominates the transition into sleep, deep meditation, and the hypnagogic state between waking and dreaming where imagery and vivid mental pictures arise. It is the band most associated with meditation practice and with the creative "gap" where loose associations connect. Monroe's Gateway Focus levels that emphasize mind-awake-body-asleep states (Focus 10, roughly 4–5 Hz) sit in this range. Theta is pleasant for visualisation and drifting, but if you need hard analytical concentration, theta can feel too floaty — that is a beta or gamma job.
Alpha is the "awake and calm" band — present when you close your eyes and relax, and suppressed when you concentrate hard on a demanding task. It is the band with the strongest evidence for relaxation and anxiety reduction: the 2019 Garcia-Argibay meta-analysis (22 controlled studies) found a small-to-moderate effect on state anxiety (d ≈ 0.45), comparable to other relaxation techniques. A 10 Hz alpha beat is a sensible default for the wind-down hour before bed, for light reading, or for anyone who finds theta too drowsy. It is also the gateway frequency many ramp through on the way down to theta and delta.
Beta is the active, outward-attention band of normal waking thought, problem-solving, and conversation. Proponents use beta beats (often 14–20 Hz) for study and analytical work. The evidence is weak and mixed: some small studies report attention improvements, others find no effect, and a 2023 trial on gamma found none at all. A practical approach is to treat beta as an experiment: try a short beta session for a specific task and keep it only if it subjectively helps. Because beta is close to your natural waking state, it is also the band least likely to feel like it is "doing something" — which is itself honest feedback.
Gamma is the fastest band, linked to binding information across brain regions during complex cognition and to 40 Hz activity in Alzheimer's research. A 2017 study (Colzato et al., Psychological Research) found 40 Hz gamma binaural beats narrowed the spotlight of attention on a global-local task, and earlier work linked gamma to improved performance on an attentional-blink task. But a 2023 trial (Leistiko et al., Current Psychology) using the attention network test found no improvement from 40 Hz gamma. The honest take: gamma is intriguing, individual, and not proven — see gamma waves for focus for the full analysis.
| Goal | Band | Suggested Hz |
|---|---|---|
| Fall asleep / deep sleep | Delta | 2–3 Hz |
| Wind down before bed | Alpha | 10 Hz |
| Meditation / visualization | Theta | 5–6 Hz |
| Relaxed focus / reading | Alpha | 10–11 Hz |
| Study / analytical work | Beta | 14–20 Hz |
| Peak / high-intensity focus | Gamma | 40 Hz |
For healthy adults at a comfortable volume, binaural beats carry no known dangers. The main precautions are specific and limited: epilepsy or a seizure history warrants a doctor's check first (any rhythmic auditory stimulation could theoretically trigger a response); people with severe psychiatric conditions should also consult a professional; and overnight headphone use means keeping volume low (< 60 dB is the common guidance) and using a timer rather than running eight hours of audio. Binaural beats are a relaxation and focus support, not a treatment for any medical condition.
A practical way to explore the whole chart is a tool that lets you pick any band and fade between them. Sleeplull is an offline Windows desktop app that generates binaural beats and isochronic tones live at precise frequencies — you can select a target band (2 Hz delta through 40 Hz gamma) and follow one of 42 guided sessions across 7 waves. It's a one-time $39 lifetime license, no account, no ads, no tracking, and everything runs offline on your machine. It is an independent software implementation of the declassified 1983 CIA Gateway Process structure, not affiliated with the Monroe Institute. Start with the best frequencies for deep sleep, then experiment across the bands. sleeplull.com
No. The best frequency depends on your goal and your individual response. For sleep it's delta; for relaxation alpha; for meditation theta; for focus beta or gamma. Most people benefit from testing a band for a few sessions and keeping what works.
Not consistently. Beta and gamma are used for focus, but the research is mixed and individual-dependent. Start low (beta around 14–18 Hz) before trying gamma.
Yes — ramping from alpha down to theta or delta mirrors natural sleep onset and many people prefer it. Some apps let you schedule frequency changes; Sleeplull's guided sessions include gentle ramp transitions across bands.