Force Index is one of forex technical indicator used in forex technical analysis. This index created by Alexander Elder calculates the Bulls Power at every rise and fall. It is better to buy when the forces become minus (fall below zero) in the period of indicator increasing tendency.

The Force Index, created by Alexander Elder and described in his famous book Trading For A Living, is an oscillator, that attempts to measure the force of bulls during uptrends and the force of bears in downtrends. It takes into account price and volume.

The Force Index (FI) is an indicator used in technical analysis to illustrate how strong the actual buying or selling pressure is. High positive values mean there is a strong rising trend, and low values signify a strong downward trend.

The FI is calculated by multiplying the difference between the last and previous closing prices by the volume of the commodity, yielding a momentum scaled by the volume. The strength of the force is determined by a larger price change or by a larger volume.

The Short-Term Force Index is normally smoothed with a 2-day exponential moving average. A 13-day exponential moving average of the Force Index helps tracking longer term changes in the force.