This chart alone has saved many of my grows from failure. I also use the one provided by devry university but there are others out there and they can all vary slightly but they have close to the same recommendations for general parameters that should provide close to the vpd you are aiming for as there are others factors to vpd than just humidity and temperature alone.
Therefore is best to get some kind of device like the Govee sensors on my product recommendation list that can give you the VPD reading in your grow room so that way you can then just dial-in using that sensor and it takes out to guess work, but you can still do well if all you have is the temperature and humidity in your measurement. It is more accurate to get a leaf temp measurement and then do the calculations but if you have a sensore at canopy height you can get close enough and being off by a small amount is still going to be monumentally better than not checking these things at all, and for the cheap cost of govee sensor it’s a no brainer for me.
This vpd chart which has been my go to chart for dialing in my rooms temp and humidity for the past few years now and it really has helped the plants show off their true colors. you may have caught this chart in one of my videos and tried to take a screen shot of it so here it is for you to use however you like, i suggest you print it out and put it on the wall near your grow to remind you where things should be. VPD has many different factors that play into its range such as your height from sea level etc. but this is a great place to start, my grow is on the east coast of Massachusetts pretty much at sea level if that helps.
Also worth noting as many of you may know i only typically grow photo period strains so these would be best applied to photo periods as you can control each stage of growth and dial in the environment perfectly for each part of the growth cycle, which i suppose you could do the same with autos its just that you dont have control over when they start flowering so you may want to dial back humidity to a flowering vpd level a bit sooner than if you had the ability to choose when thing start flowering, but the same vpd would apply to all plants, autos or photo periods and regular or feminized seeds.
To learn about how to grow your own organnabis check my other articles and youtube!