Volume indicators analyze trading activity to confirm price movements and identify potential reversals. They help understand the conviction behind price changes.
Why Volume Matters
Volume Principles
Key Concepts:
- Volume confirms price moves
- High volume = conviction
- Low volume = weak move
- Volume precedes price
Volume Analysis
Questions Answered:
- Is the move strong?
- Is there participation?
- Is trend sustainable?
- Accumulation or distribution?
On-Balance Volume (OBV)
Definition
OBV:
- Cumulative volume indicator
- Created by Joe Granville
- Running total of volume
- Directional measure
Calculation
Simple:
- Up day: Add volume to OBV
- Down day: Subtract volume from OBV
- Accumulates over time
Interpretation
Rising OBV:
- Buying pressure
- Accumulation
- Bullish
Falling OBV:
- Selling pressure
- Distribution
- Bearish
OBV Signals
Confirmation:
- OBV rising with price = confirmed uptrend
- OBV falling with price = confirmed downtrend
Divergence:
- Price up, OBV down = weakness
- Price down, OBV up = strength
Volume Price Trend (VPT)
Definition
VPT:
- Like OBV but proportional
- Considers percentage change
- More precise measurement
Calculation
Method:
- Volume × (Today's close - Yesterday's close) / Yesterday's close
- Add to running total
Usage
Same As OBV:
- Confirmation
- Divergence
- Trend analysis
Money Flow Index (MFI)
Definition
MFI:
- Volume-weighted RSI
- Oscillator (0-100)
- Overbought/oversold levels
Calculation
Steps:
- Calculate typical price
- Calculate money flow
- Calculate money ratio
- Calculate MFI
Standard Settings
Default:
- 14 periods
- Overbought: 80
- Oversold: 20
Interpretation
Above 80:
- Overbought
- Heavy buying
- Watch for reversal
Below 20:
- Oversold
- Heavy selling
- Watch for reversal
MFI Signals
Similar to RSI:
- Overbought/oversold
- Divergences
- Centerline crosses
Accumulation/Distribution Line
Definition
A/D Line:
- Measures money flow
- Uses close location value
- Cumulative indicator
Close Location Value
Concept:
- Where did price close in range?
- Near high = accumulation
- Near low = distribution
Interpretation
Rising A/D:
- Accumulation
- Closes near highs
- Bullish
Falling A/D:
- Distribution
- Closes near lows
- Bearish
A/D Divergence
Warning Signal:
- Price rising, A/D falling
- Price falling, A/D rising
- Potential reversal
Chaikin Money Flow (CMF)
Definition
CMF:
- Oscillator based on A/D
- Ranges -1 to +1
- Zero centerline
Standard Settings
Default:
- 21 periods
- Above 0 = buying pressure
- Below 0 = selling pressure
Interpretation
Positive CMF:
- Accumulation
- Buying pressure dominant
Negative CMF:
- Distribution
- Selling pressure dominant
CMF Signals
Buy Signal:
- CMF crosses above zero
- Rising CMF
- With price uptrend
Sell Signal:
- CMF crosses below zero
- Falling CMF
- With price downtrend
Volume Rate of Change
Definition
VROC:
- Volume momentum
- Compares current to past volume
- Percentage change
Interpretation
High VROC:
- Volume spike
- Increased interest
- Potential significance
Low/Negative VROC:
- Below average volume
- Decreased interest
- Weak conviction
Volume Weighted Average Price (VWAP)
Definition
VWAP:
- Average price weighted by volume
- Intraday benchmark
- Institutional reference
Calculation
Formula:
- Sum of (Price × Volume) / Total Volume
- Calculated from session start
Usage
Day Trading:
- Above VWAP = bullish
- Below VWAP = bearish
- Mean reversion target
VWAP Strategies
Institutional:
- Execute around VWAP
- Benchmark performance
Retail:
- Support/resistance level
- Trade direction
Volume Profile
Definition
Volume Profile:
- Volume at price levels
- Horizontal histogram
- Shows where trading occurred
Key Levels
Point of Control (POC):
- Highest volume price
- Key reference level
Value Area:
- 70% of volume range
- High and low boundaries
Usage
Support/Resistance:
- High volume = strong level
- Low volume = weak level
- POC attracts price
Trading with Volume Indicators
Confirmation Strategy
Process:
- Identify price signal
- Check volume indicator
- Confirm with volume
- Take trade if aligned
Divergence Strategy
Process:
- Identify price trend
- Check volume indicator
- Look for divergence
- Prepare for reversal
Breakout Confirmation
Method:
- Price breaks level
- Volume indicator confirms
- High volume = valid break
- Low volume = suspect
Common Mistakes
Ignoring Volume
Mistake: Trading price alone
Solution: Always check volume
Volume in Isolation
Mistake: Using volume without price
Solution: Combine with price analysis
Wrong Timeframe
Mistake: Daily volume for intraday trades
Solution: Match timeframes
Ignoring Divergences
Mistake: Not noticing disagreements
Solution: Always check for divergence
Volume Indicator Checklist
Before Trade
- [ ] Volume confirms move
- [ ] No divergence present
- [ ] Volume indicator aligned
- [ ] Unusual volume noted
- [ ] Context understood
Key Takeaways
- Volume confirms price movements
- OBV tracks cumulative buying/selling
- MFI is volume-weighted RSI
- A/D Line shows money flow direction
- CMF oscillates around zero
- VWAP is institutional benchmark
- Divergences warn of reversals
- Always combine volume with price
What's Next?
Learn about ADX for measuring trend strength.
This article is for educational purposes only and does not constitute financial advice.
Risk warning. This is education only, not financial, investment, tax or legal advice, and not a recommendation to buy or sell anything. Trading forex, CFDs, stocks, commodities, futures, options and crypto is high-risk; with leverage you can lose more than you deposit, and most retail traders lose money. Before you trade or invest in any form, check the local laws where you are and the rules of your country of residence, and consider your own financial situation; if in doubt, ask a licensed adviser. Past and tested results, and all examples, are for illustration only and do not guarantee future results.