Studies · Volume

Market Facilitation Index (BW MFI)

marketFacilitationIndex · Bill Williams' price movement per unit of volume

Drawn in its own panelReads high, low, volume

Hover the chart to read values · practice data: a seeded random walk with no overnight gaps

What it measures

The bar’s range divided by its volume: how much price movement each unit of volume bought.

How traders use it

• Read together with the change in volume (four cases): index and volume both up means the move is being funded; index up with volume down is a move on thin participation; index down with volume up often comes before a breakout.

Parameters

None — the study is fully defined by its formula.

Good to know

Bill Williams’ indicator, not the Money Flow Index, which shares the abbreviation MFI. The numbers depend on the instrument’s volume units.