Brief Description
On Balance Volume (OBV) is a volume-based technical indicator introduced by Joseph Granville in the 1960s. It is designed to measure buying and selling pressure by relating changes in volume to changes in price. The core idea behind OBV is that volume often precedes price, meaning that shifts in volume can signal future price movements before they become visible on the chart.
OBV is displayed as a cumulative line that rises or falls based on whether price closes higher or lower than the previous period. The absolute value of OBV is not important; instead, traders focus on its direction, slope, and relationship to price.
Formula:
OBV is calculated incrementally as follows:
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If today’s close is higher than yesterday’s close:
OBV = Previous OBV + Current Volume
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If today’s close is lower than yesterday’s close:
OBV = Previous OBV − Current Volume
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If today’s close is unchanged:
OBV = Previous OBV
Uses:
1. Confirming Trends
OBV is commonly used to confirm price trends.
- Rising OBV alongside rising prices suggests strong buying pressure and trend confirmation.
- Falling OBV alongside falling prices indicates strong selling pressure.
If price is trending but OBV is flat or moving in the opposite direction, it may signal weakening momentum.
2. Detecting Divergences
One of the most popular uses of OBV is identifying divergences between price and volume, therefore acting as a leading indicator:
Bullish divergence: Price makes lower lows while OBV makes higher lows, suggesting accumulation.
Bearish divergence: Price makes higher highs while OBV makes lower highs, suggesting distribution.
These divergences can act as early warnings of potential trend reversals.
3. Breakout Confirmation
OBV can help validate breakouts from consolidation or chart patterns. A price breakout accompanied by a strong move in OBV is generally considered more reliable than a breakout with weak or declining volume. For example, in the chart listed below, Rheinmetall’s stock, after consolidating for a while, broke out of a price congestion area, with the OBV confirming the breakout by moving above its dashed resistance line. Moreover, the subsequent price retracement failed to reenter the consolidation area and also the OBV failed to move below its dashed support line. This moves us to the 4th use of the OBV.
4. Support and Resistance Analysis
Trendlines can be drawn directly on the OBV line. Breaks of OBV trendlines may occur before similar breaks on price charts, offering early insight into potential price moves.
Limitations:
01
Ignores Price Magnitude
OBV only considers whether price closes higher or lower, not how much it moves. A small price change on high volume affects OBV the same way as a large price change on the same volume. This poses the risk of missing important price pattern objectives. OBV shall always be used together with price action.
02
Susceptible to Volume Spikes
Large one-period volume spikes—such as those caused by news events—can significantly distort the OBV line and reduce its short-term reliability. Therefore, a use of Moving Average could be an option.
03
Less Effective in Low-Volume Markets
In thinly traded assets, volume data may be inconsistent or unreliable, which can weaken OBV signals
04
Requires Confirmation
OBV is best used as a confirmation tool rather than a standalone indicator. Combining it with price action, trend analysis, or other volume-based indicators improves its effectiveness.
