Balance of Power Indicator¶

OVERVIEW¶

The Balance of Power (BoP) indicator is a technical momentum oscillator available in the Tapeboard market terminal. It measures the degree to which buyers or sellers control price action during a given period by evaluating where the closing price settles relative to the period's high and low extremes. The indicator oscillates around a zero line, giving traders a clear visual of market control and potential momentum shifts before they appear in price alone.

Note

BoP was developed by Don Worden. A positive value indicates buyer dominance; a negative value indicates seller dominance.

HOW IT WORKS¶

Calculation¶

BoP is derived from three data points: the period open, the period high, the period low, and the closing price.

BoP = (Close - Open) / (High - Low)

In Tapeboard, the raw BoP value is automatically smoothed with an Exponential Moving Average (EMA) to filter noise and surface tradeable signals. The default smoothing length is 14 periods.

Signal	Condition
Buyers taking control	Smoothed BoP crosses above zero
Sellers taking control	Smoothed BoP crosses below zero
Trend weakening	Price makes higher highs; BoP makes lower highs (bearish divergence)
Reversal building	Price makes lower lows; BoP makes higher lows (bullish divergence)

Worked Example¶

On a daily chart of NVDA during an uptrend:

Open: $840
Low: $830
High: $860
Close: $855

BoP = ($855 - $840) / ($860 - $830)
BoP = $15 / $30 = 0.50

A reading of 0.50 indicates strong bullish control. The close settled in the upper half of the day's range above the open. If the 14-day EMA subsequently crosses above zero, this confirms a broader shift toward bullish momentum.

Tip

If NVDA continues printing higher highs while the BoP EMA rolls over and produces lower highs, treat this as an early warning that buying pressure is exhausting before price confirms the reversal.

HOW TO USE¶

Trend Confirmation¶

BoP functions primarily as a trend-confirmation tool. Use it alongside moving averages or price structure to validate the direction of a trend rather than as a standalone entry signal.

Zero-Line Crossovers¶

Monitor zero-line crossovers for early reversal signals.

Bullish crossover — BoP EMA moves from negative to positive territory; consider long entries.
Bearish crossover — BoP EMA moves from positive to negative territory; consider short entries or exits.

Divergence Setups¶

Divergence Type	Price Action	BoP Behaviour	Expected Outcome
Bullish	Making lower lows	Printing higher lows	Anticipate bullish reversal
Bearish	Making higher highs	Printing lower highs	Anticipate bearish reversal

Use the zero-line crossover as the execution trigger after identifying a divergence.

Tip

Pair BoP with On-Balance Volume (OBV) or the Money Flow Index (MFI) to validate the strength of buying or selling pressure. BoP measures price action only — it does not incorporate volume.

LIMITATIONS¶

Limitation	Detail
Gap blindness	A stock that gaps up significantly but closes lower shows negative BoP, obscuring bullish overnight pressure
Compressed ranges	When High and Low are nearly identical, the denominator approaches zero and produces erratic spikes
No volume data	BoP is a pure price-action measure; it does not reflect volume and should not be interpreted as a volume indicator