# What is the SpotGamma Imp 1 Day Move?

The SpotGamma Imp 1 Day Move is a proprietary estimate of how much the SPX index may move the for the next cash session.

**Why does the SpotGamma Imp 1 Day Move matter?**

Our gamma derived estimate provides a valuable 1 day estimate of SPX movement.

**How to use the SpotGamma Imp 1 Day Move?**

To calculate the estimated range on the day, ± the SG Implied Move from the SPX cash price. This is our estimated 1 standard deviation range for the day.