Real-Time RVOL Scanner for Day Traders
The best free relative volume (RVOL) scanner for day trading. Detect unusual volume spikes across all U.S. stocks in real time — pre-market, regular hours, and after hours. Filter by RVOL level and get live alerts the moment a stock lights up.
What Is Relative Volume (RVOL)?
Relative volume compares a stock's current trading volume to its historical average volume for the same time of day. An RVOL of 3.0x means the stock is trading at three times its normal pace — a signal worth watching.
Unlike raw volume, RVOL adjusts for the natural rhythm of the trading day — pre-market is quieter than the open, and lunch is slower than the close. This minute-by-minute baseline makes RVOL a much more accurate indicator of genuine unusual activity.
RVOL Levels Explained
Elevated volume. Watch but not yet actionable for most strategies.
Significant volume. Often precedes a momentum move or breakout.
Strong volume spike. High probability of a tradeable intraday move.
Exceptional volume. Expect wide ranges and fast price action.
Extreme volume surge. Possible catalyst — news, halt, or squeeze. Maximum urgency.
Scanner Features
Minute-by-Minute Baseline
RVOL calculated against the historical average for each specific minute — not a crude daily average.
Real-Time WebSocket Delivery
New RVOL alerts pushed to the dashboard within seconds. No polling, no refresh.
Level 1–5 Classification
Alerts classified from Level 1 (2x normal) to Level 5 (10x+) so you can filter by urgency.
200 EMA Context
Every RVOL alert shows whether the stock is above or below its 200-day EMA — critical for bias.
Dollar Volume Badge
See 1-minute dollar volume so you can instantly judge liquidity on every alert.
All Sessions Covered
Pre-market (4 AM), regular hours (9:30 AM), and after-hours (up to 8 PM ET).
Frequently Asked Questions
What is RVOL (relative volume)?
RVOL is the ratio of a stock's current trading volume to its historical average volume for the same time of day. An RVOL of 3.0x means the stock is trading at three times its normal volume for that minute. High RVOL signals unusual interest — often driven by news, catalysts, or technical breakouts.
What makes a good RVOL scanner for day trading?
The best free RVOL scanner for day trading updates in real time (not delayed), classifies volume by session (pre-market vs. regular hours), provides context like price, EMA levels, and dollar volume, and filters out illiquid tickers. TheDesperateTrader does all of this and is completely free.
How is RVOL calculated on TheDesperateTrader?
RVOL is calculated per minute using a rolling historical baseline — the average volume for that specific minute of the day across recent trading sessions. This minute-by-minute baseline gives a much more accurate signal than comparing to the daily average, because pre-market volume is naturally lower than midday volume.
Is TheDesperateTrader RVOL scanner really free?
Yes. The RVOL scanner and public alert feed are completely free. Real-time WebSocket delivery and the full live dashboard require a free account. No credit card is required at signup.
Does the RVOL scanner work pre-market?
Yes. Scanning runs from 4:00 AM ET through 8:00 PM ET, covering full pre-market and after-hours sessions. Pre-market RVOL is especially useful for identifying gappers before the 9:30 AM open.
Can I use this RVOL scanner on mobile?
Yes. TheDesperateTrader is fully mobile-responsive and works on any smartphone or tablet browser. No app download required.
Start Scanning RVOL for Free
No credit card required. The RVOL scanner is part of the full alerts dashboard, free to access.