Volume-weighted momentum

MFIMoney Flow Index

Q: What is the difference between MFI and RSI?

MFI weights each bar by volume; RSI weights every bar equally. MFI is "RSI with volume confirmation." On markets with real volume data (stocks, futures), MFI divergence is meaningfully more reliable than RSI divergence.

Q: Does MFI work on forex?

Forex is OTC with no centralized volume, so MFI uses tick volume as a proxy. The proxy correlates with actual volume but is not identical. On liquid pairs (EUR/USD, etc.) tick volume is good enough; on exotic pairs the correlation breaks down.

Q: What are the standard MFI settings?

14-period lookback with 80 / 20 overbought / oversold thresholds. These are the originals from Quong and Soudack's 1989 publication.

Q: Why is MFI considered a "smart money" indicator?

The volume weighting captures where institutional capital is flowing. Big traders move volume; retail traders do not. A divergence that shows up on MFI but not on plain RSI specifically signals smart-money distribution / accumulation.

Q: Can I replace RSI with MFI?

On markets with real volume data, MFI is the strictly-better choice. On forex with tick-volume proxies, the two are roughly comparable — many traders use RSI for primary momentum and MFI for confirmation.

MFI (Money Flow Index) is "RSI weighted by volume." Above 80 is overbought, below 20 oversold. Divergence with volume confirmation is the strongest signal in the entire indicator universe.

14 candles

Default period

0 to 100

Range

> 80 / < 20

Signal levels

Volume-confirmed divergence

Best use

What is MFI?

The Money Flow Index was developed by Gene Quong and Avrum Soudack in 1989 as a volume-weighted alternative to RSI. The math is RSI's structure (average gains vs average losses on a 0-100 scale) but weighted by traded volume on each bar.

The result is a momentum oscillator that filters out low-volume moves and emphasizes high-volume ones. A divergence on MFI carries more weight than a divergence on plain RSI because it specifically signals volume-confirmed momentum loss.

Category: Volume-weighted momentum
Default settings: 14 candles
Signal range: 0 to 100
Introduced by: Gene Quong and Avrum Soudack, 1989

How MFI works

Calculation per bar:

Typical Price = (High + Low + Close) / 3 Money Flow = Typical Price * Volume Positive Money Flow = sum of money flows on bars where TP rose Negative Money Flow = sum where TP fell MFI = 100 - (100 / (1 + (Positive MF / Negative MF)))

The 14-period default mirrors RSI's default. MFI bounds the same 0-100 range and uses the same 80 / 20 thresholds for overbought / oversold. The key difference is volume weighting — bars with heavy volume contribute more to the indicator than light-volume bars.

How to use MFI

Two highest-conviction uses.

1. Volume-confirmed divergence: Higher high in price, lower high in MFI is the highest-quality divergence signal in the indicator universe. The volume component ensures that the divergence reflects real distribution by larger players, not just thin-volume drift.

2. 80 / 20 reversals with volume context: Unlike RSI, an MFI reading at 80+ that occurs on declining volume signals that the rally is losing institutional support. Pair with structure (resistance level) for entries.

MFI does require volume data. On forex pairs (OTC market), tick volume is a proxy — it correlates with actual transaction volume but is not identical. On futures-based FX or equity markets, MFI is more directly meaningful.

Want more practical context? Look up unfamiliar terms in the forex glossary, or see how indicators stack on real charts in the trading blog.

MFI FAQ

What is the difference between MFI and RSI?

MFI weights each bar by volume; RSI weights every bar equally. MFI is "RSI with volume confirmation." On markets with real volume data (stocks, futures), MFI divergence is meaningfully more reliable than RSI divergence.

Does MFI work on forex?

Forex is OTC with no centralized volume, so MFI uses tick volume as a proxy. The proxy correlates with actual volume but is not identical. On liquid pairs (EUR/USD, etc.) tick volume is good enough; on exotic pairs the correlation breaks down.

What are the standard MFI settings?

14-period lookback with 80 / 20 overbought / oversold thresholds. These are the originals from Quong and Soudack's 1989 publication.

Why is MFI considered a "smart money" indicator?

The volume weighting captures where institutional capital is flowing. Big traders move volume; retail traders do not. A divergence that shows up on MFI but not on plain RSI specifically signals smart-money distribution / accumulation.

Can I replace RSI with MFI?

On markets with real volume data, MFI is the strictly-better choice. On forex with tick-volume proxies, the two are roughly comparable — many traders use RSI for primary momentum and MFI for confirmation.

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