How do I Graph the 21-day SMA throughout the Trading Day

External question — Personal Finance Stack Exchange Author: Paul Kranz Original post: https://money.stackexchange.com/questions/165089 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. How do I graph this minute's effect of the stock price on the 21-day SMA? I know the average of the last 21 closes is the 21-day SMA of the previous close, but what is the formula for computing this minute's price on the 21-day SMA?

External answer — Personal Finance Stack Exchange Author: Bob Baerker Original post: https://money.stackexchange.com/a/165097 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. If you want to know the effect of this minute's stock price on the 21-day SMA, you simply assume that this minute's value is today's close. Then you calculate the new 21-day SMA (the formula remains the same).