Formulas for tank volume calculation by using DATE

[billybarty]

I need to make a sheet that will let me know the volume in a container by using the date and i don't know how to proceed. I have columns with the date the container was last filled and the volume on that day, a column for the rate of consumption per day, a column for what is the volume today, a column for what the volume will be in x number of days (currently 7) and a column for the date that the volume will be 40 liters or less. I had tried this before at my previous job and had some help with this on this forum but am unable to find the post. Also, I am using Excel 2003 at this position and it doesn't have as much built-in help on building formulas. Any help is appreciated

 

[shg]

FormR, thank you.