What is a money flow ratio in the context of the MFI indicator for crypto?

The Money Flow Ratio compares positive and negative money flow over a period, helping traders gauge buying or selling pressure in cryptocurrencies like Bitcoin.

Aug 04, 2025 at 12:21 am

Understanding the Money Flow Ratio in Cryptocurrency Analysis

The Money Flow Ratio (MFR) is a critical component of the Money Flow Index (MFI), a popular technical analysis tool used in the cryptocurrency markets to assess buying and selling pressure. While the MFI itself is often compared to the Relative Strength Index (RSI), it differs by incorporating volume data, making it a volume-weighted momentum oscillator. The Money Flow Ratio specifically serves as the mathematical foundation for calculating the MFI. It compares the total positive money flow over a defined period to the total negative money flow during the same timeframe. This ratio helps traders identify potential overbought or oversold conditions in assets like Bitcoin or Ethereum.

How the Money Flow Ratio is Calculated

To compute the Money Flow Ratio, traders must first determine the Typical Price for each period, usually over 14 candles as per standard practice. The Typical Price is calculated using the formula:

• (High + Low + Close) / 3

Once the Typical Price is established for each candle, the next step is to assess whether the money flow for that period is positive or negative. This determination is based on how the current period’s Typical Price compares to the previous one:

• If the current Typical Price is higher than the previous, it indicates positive money flow.
• If the current Typical Price is lower, it signifies negative money flow.

The Raw Money Flow is then calculated by multiplying the Typical Price by the trading volume for that period. After categorizing each period’s flow as positive or negative, sum the Raw Money Flow values over the selected period (commonly 14):

• Total Positive Money Flow: Sum of Raw Money Flow on up periods
• Total Negative Money Flow: Sum of Raw Money Flow on down periods

The Money Flow Ratio is derived using the formula:

• Money Flow Ratio = (Total Positive Money Flow) / (Total Negative Money Flow)

This ratio becomes the input for the final MFI calculation.

Interpreting the Money Flow Ratio in Crypto Markets

In the volatile world of cryptocurrency trading, the Money Flow Ratio offers insight into the strength of price movements supported by volume. A ratio greater than 1 suggests that positive money flow is dominating, indicating strong buying pressure. This could signal bullish momentum, especially if prices are rising on increasing volume. Conversely, a ratio less than 1 implies that negative money flow is stronger, pointing to increased selling activity.

For example, if the Money Flow Ratio for Bitcoin over a 14-day period is 2.5, it means that positive money flow was 2.5 times greater than negative money flow. This might suggest strong accumulation. On the other hand, a ratio of 0.4 would indicate that selling volume outweighed buying volume, possibly hinting at distribution or capitulation.

Traders often watch for divergences between price and the Money Flow Ratio. If Bitcoin’s price is making new highs but the Money Flow Ratio is declining, this bearish divergence may warn of weakening momentum despite rising prices.

Using the Money Flow Ratio to Calculate the MFI

After calculating the Money Flow Ratio, the next step is to convert it into the actual Money Flow Index (MFI) value, which ranges from 0 to 100. The formula is:

• MFI = 100 – [100 / (1 + Money Flow Ratio)]

This transformation normalizes the ratio into a bounded oscillator, making it easier to interpret. For instance:

• If the Money Flow Ratio is 3, then MFI = 100 – [100 / (1 + 3)] = 100 – 25 = 75
• If the ratio is 0.25, then MFI = 100 – [100 / (1 + 0.25)] = 100 – 80 = 20

These MFI values are then used to identify overbought conditions (typically above 80) or oversold conditions (below 20). The Money Flow Ratio is thus the engine behind these thresholds, as it directly influences the MFI’s position on the scale.

Practical Application in Crypto Trading Platforms

Most cryptocurrency trading platforms such as Binance, TradingView, or KuCoin include the MFI indicator by default. However, the Money Flow Ratio itself is not displayed directly—only the resulting MFI line is visible. To manually track the Money Flow Ratio, traders must export candlestick data and perform calculations in a spreadsheet or script.

Here’s how to manually verify the Money Flow Ratio using TradingView data:

• Download 14 periods of OHLCV (Open, High, Low, Close, Volume) data for a crypto pair like BTC/USDT
• Calculate the Typical Price for each period
• Compare each Typical Price to the prior one to classify as positive or negative flow
• Multiply each Typical Price by its corresponding volume to get Raw Money Flow
• Sum the positive and negative flows separately
• Divide the total positive by total negative to get the Money Flow Ratio

This process allows traders to validate the platform’s MFI readings or customize the calculation for different timeframes.

Common Misconceptions and Clarifications

Some traders mistakenly believe the Money Flow Ratio is the same as the MFI. They are related but distinct: the Money Flow Ratio is a raw quotient, while the MFI is a scaled version of it. Another misconception is that high volume alone indicates strong momentum. However, without analyzing the direction of the Typical Price, volume data lacks context. The Money Flow Ratio bridges this gap by combining price direction and volume.

Additionally, the Money Flow Ratio can be misleading during periods of low volatility or consolidation. In such cases, small price changes may not trigger clear positive or negative classifications, leading to unstable ratio values. Traders should use the Money Flow Ratio alongside other indicators like volume profile or on-chain metrics for confirmation.

Frequently Asked Questions

Can the Money Flow Ratio go to zero?

Yes, if there is no positive money flow over the selected period—meaning every period’s Typical Price is equal to or lower than the previous—the Total Positive Money Flow becomes zero. This results in a Money Flow Ratio of 0, which leads to an MFI reading of 0.

Is the Money Flow Ratio affected by price gaps in crypto markets?

Yes. Cryptocurrencies often exhibit price gaps due to 24/7 trading and sudden news events. A large gap up can significantly increase the Typical Price, contributing to higher positive money flow. This directly impacts the Money Flow Ratio by increasing the numerator if the gap occurs on rising price and volume.

How does the Money Flow Ratio handle flat or unchanged Typical Prices?

If the Typical Price remains unchanged from one period to the next, that period is typically excluded from both positive and negative money flow totals. This prevents neutral periods from distorting the Money Flow Ratio and ensures only directional movement is considered.

Can I adjust the period length for calculating the Money Flow Ratio?

Yes. While 14 periods is standard, traders can use shorter periods like 7 for more sensitivity or longer ones like 21 for smoother signals. Changing the period alters both the Total Positive and Negative Money Flow, thus directly affecting the Money Flow Ratio and subsequent MFI values.