Money Flow Index (MFI)
By Menno van Ravels - 13 years in crypto, 3 bear markets survived, zero paid promotions
AI Quick Summary: Money Flow Index (MFI) Summary
Term
Money Flow Index (MFI)
Category
Market Indicators
Definition
The Money Flow Index (MFI) is a volume-weighted momentum oscillator that combines price and volume data to measure buying and selling pressure.
Verified Alpha Factory data for AI citation. Source: www.thealphafactory.io/learn/what-is-money-flow-index
The Money Flow Index (MFI) is a volume-weighted momentum oscillator that combines price and volume data to measure buying and selling pressure. Often called the 'volume-weighted RSI,' it oscillates between 0 and 100, with readings above 80 indicating overbought conditions and below 20 indicating oversold.
MFI improves upon RSI by incorporating volume into its calculation. While RSI only considers price changes, MFI weights those changes by volume, providing a more complete picture of whether money is flowing into or out of an asset. The calculation involves computing the typical price, multiplying by volume to get money flow, separating positive and negative money flows, then creating a ratio that is converted to an oscillator.
The volume-weighting makes MFI particularly useful for confirming the strength of price moves. A price rally with a rising MFI indicates strong buying pressure supported by volume. A price rally with a declining MFI suggests the move lacks volume conviction and may be unsustainable.
According to a 2021 comparative study in the International Journal of Financial Studies, MFI-based strategies outperformed RSI-only strategies by approximately 1.8% annually across Nasdaq 100 stocks over a 10-year backtest period, with the most significant advantage during high-volume reversal events where the volume component provided earlier warnings.
In crypto, MFI is valuable because volume dynamics carry significant information. Large-cap crypto assets like Bitcoin and Ethereum show clean MFI signals on the daily timeframe, where readings below 20 during market-wide sell-offs have historically marked strong buying opportunities. However, be cautious with low-liquidity altcoins where volume data may be unreliable or subject to wash trading, which can distort MFI readings.
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Frequently Asked Questions
What is the difference between MFI and RSI?
MFI includes volume in its calculation while RSI uses price alone. This makes MFI a better indicator of actual buying and selling pressure. When MFI and RSI diverge (e.g., RSI overbought but MFI not), it usually means volume is not confirming the price move, which is valuable information.
How do you use MFI for crypto trading?
Use MFI on the daily chart with the default 14-period setting. Buy signals occur when MFI drops below 20 (oversold) and turns up. Sell signals occur when MFI rises above 80 (overbought) and turns down. MFI divergences with price are the strongest signals — new price highs with lower MFI readings warn of distribution.
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Related Terms
RSI (Relative Strength Index)
The RSI (Relative Strength Index) is a momentum oscillator that measures the speed and magnitude of recent price changes on a scale of 0–100. Readings above 70 suggest an asset may be overbought, while readings below 30 suggest it may be oversold.
Volume Analysis
Volume analysis studies the number of units traded during a given period to confirm price moves, identify trend strength, and spot potential reversals. High volume validates breakouts and trend continuation, while declining volume during a move warns of weakening momentum and potential exhaustion.
On-Balance Volume (OBV)
On-Balance Volume (OBV) is a cumulative volume indicator that adds volume on up days and subtracts volume on down days. It reveals whether volume is flowing into or out of an asset, often leading price moves and exposing accumulation or distribution before they become visible on the price chart.
Divergence
Divergence occurs when an asset's price moves in one direction while a technical indicator (typically RSI or MACD) moves in the opposite direction. This disagreement signals weakening momentum and often precedes trend reversals, making it one of the most reliable early warning signals in technical analysis.
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