measure two emas price difference indicator

 The standard technical indicator used to measure the price difference between two Exponential Moving Averages (EMAs) is the Moving Average Convergence Divergence (MACD), or more broadly, a Price Oscillator (PO). [1, 2]

When you strip away the secondary lines, the core line of a MACD is quite literally just the mathematical difference between a shorter (fast) EMA and a longer (slow) EMA. [1]

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1. The Core Indicators

MACD (Moving Average Convergence Divergence): By default, it subtracts the 26-period EMA from the 12-period EMA (12 EMA - 26 EMA). This value fluctuates above and below a Zero Line. [1]
Price Oscillator (PO) / Absolute Price Oscillator (APO): This operates exactly like the MACD but allows you to freely input any two EMA lengths you want (e.g., a 50 EMA and a 200 EMA) to measure their absolute dollar or point difference. [1, 2]
Percentage Price Oscillator (PPO): Similar to the APO, but it calculates the difference as a percentage rather than a raw dollar amount, making it easier to compare across different asset prices. [1, 2, 3, 4]

2. How the Visual Component Works

Most charting software (like TradingView or MetaTrader) represents this difference as an EMA Difference Histogram: [1, 2, 3, 4, 5]

Indicator State	Market Meaning	Histogram Visual
Fast EMA is above Slow EMA	Bullish momentum / Uptrend	Bars are above the zero line
Fast EMA is below Slow EMA	Bearish momentum / Downtrend	Bars are below the zero line
The gap is widening	Trend is strengthening	Bars get taller / change to a bright color
The gap is narrowing	Trend is losing steam / Pullback	Bars shrink / change to a faded color
The bars cross 0	The two EMAs have crossed	A crossover signal is triggered

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3. Creating a Custom "EMA Difference" Indicator

If you are using TradingView, you don't even need to write code. You can search the public library for terms like "EMA Difference" or "EMA Difference Histogram" to find pre-built tools. [1, 2]

However, if you want to paste a clean, custom version directly into the Pine Script Editor, use this code:

pinescript

//@version=5
indicator("Custom EMA Difference Indicator", overlay=false)

// Inputs
fastLength = input.int(10, title="Fast EMA Length")
slowLength = input.int(20, title="Slow EMA Length")

// Calculations
fastEMA = ta.ema(close, fastLength)
slowEMA = ta.ema(close, slowLength)
emaDiff = fastEMA - slowEMA

// Color Logic (Bright when expanding, dark when shrinking)
isExpanding = math.abs(emaDiff) > math.abs(emaDiff[1])
histColor = emaDiff >= 0 ? (isExpanding ? color.green : color.lime) : (isExpanding ? color.maroon : color.red)

// Plotting
plot(emaDiff, title="EMA Difference", style=plot.style_histogram, color=histColor, linewidth=2)
hline(0, "Zero Line", color=color.gray, linestyle=hline.style_dashed)

Use code with caution.

4. Common EMA Pairs to Measure

Traders frequently track the differences between these specific combinations: [1]

9 EMA & 21 EMA: Highly popular for short-term swing trading and momentum tracking.
20 EMA & 50 EMA: Excellent for medium-term trend direction.
50 EMA & 200 EMA: Used to track macro market shifts (the crossing point here forms the famous "Golden Cross" or "Death Cross"). [1, 2, 3, 4, 5]

Are you planning to build this strategy for a specific asset class (like crypto, forex, or stocks)? If you tell me, I can help you pick the best timeframes and EMA periods for that market. [1]

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