Money Flow Index (MFI)
The Money Flow Index, or MFI, is a momentum indicator that adds volume to the RSI concept. Like RSI it oscillates between 0 and 100, but instead of looking only at price moves, it asks how much volume flowed in on up-days versus down-days. The result is a more nuanced read on buying and selling pressure, used by Indian swing traders for stocks and indices.
Key takeaways:
- MFI combines price and volume to gauge buying vs selling pressure.
- Range is 0–100; above 80 = overbought, below 20 = oversold.
- Best used as confirmation alongside RSI, MACD or price action.
- Divergence with price is the highest-quality MFI signal.
- Default period is 14; intraday traders may use 7–10.
How MFI is calculated
For each period, compute the Typical Price ((H+L+C)/3) and multiply by volume to get the “Raw Money Flow”. Compare it with the previous period: if today’s typical price is higher, it is positive money flow; lower, negative. Sum positive and negative flows over N periods, take the ratio, and convert to a 0–100 scale.
Reading MFI
- Above 80: Possible overbought — selling pressure may emerge in a range-bound market.
- Below 20: Possible oversold — bounce candidate.
- Divergence: MFI failing to confirm a new price high or low signals momentum exhaustion.
- Trend confirmation: Rising MFI alongside rising price confirms healthy participation.
MFI vs RSI
RSI is based purely on closing prices. MFI adds volume to the equation. In strong trends with rising volume, MFI tends to rise faster than RSI; in weak trends, it lags. Many traders display both and trade only when they agree.
Practical example
A mid-cap stock breaks above resistance with volume; MFI also rises decisively above 50. The breakout is confirmed by money-flow participation. If the same breakout happens with MFI falling, the move is suspect and worth fading or avoiding.
Limitations
- Volume data can be unreliable on small-caps and on the day before/after corporate actions.
- In strong trends, MFI can stay above 80 (or below 20) for long periods.
- Single-day events (block deals, news) can spike MFI temporarily.
Tips for Indian markets
- Apply MFI to liquid stocks and indices where volume data is meaningful.
- Combine with trend filters (moving averages, ADX) before trading reversals.
- Use weekly MFI to spot major accumulation or distribution phases in long-term holdings.
- Pair MFI divergence with candlestick reversal patterns for high-probability entries.
Frequently asked questions
Is MFI better than RSI?
Neither is universally better. MFI adds volume context; RSI is simpler. Use both for confirmation when possible.
What period should I use for MFI?
14 is default; shorten for intraday, lengthen for positional.
Can MFI be used on Nifty?
Yes, but volume reflects futures activity. Most traders prefer MFI on individual stocks.
Does MFI work on cryptocurrencies?
Yes, MFI is generic and applies to any asset with volume data.
