ta.mfi()Money Flow Index
The Money Flow Index (MFI) is a technical oscillator that uses price and volume data for identifying overbought or oversold signals in an asset. It is also known as volume-weighted RSI.
Syntax
ta.mfi(series, length) → series floatArguments
| Parameter | Type | Description |
|---|---|---|
| series | series int/float | Typical price series (commonly hlc3) for money flow. |
| length | series int | Lookback length for positive and negative money flow sums. |
Returns
Money Flow Index.
Remarks
The built-in ignores na source observations. MFI also uses chart volume; missing volume or a zero flow denominator needs attention in a custom calculation. Money flow here is a price-volume proxy, not identified cash transfers or trader positions.
Code Examples
//@version=6
indicator("ta.mfi")
plot(ta.mfi(hlc3, 14))
// same on pine
pine_mfi(src, length) =>
float upper = math.sum(volume * (ta.change(src) <= 0 ? 0 : src), length)
float lower = math.sum(volume * (ta.change(src) >= 0 ? 0 : src), length)
100.0 - (100.0 / (1.0 + upper / lower))
plot(pine_mfi(hlc3, 14))Trading Applications
Identify overbought (>80) and oversold (<20) conditions with volume confirmation
Detect divergences between price and money flow
Confirm breakouts with volume-weighted momentum
Use as a volume-enhanced alternative to RSI
Frequently Asked Questions
Generate ta.mfi() Code with AI
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