Adding blank cells using Sum/Sumproduct,Value,Mid and Search

[Allyddo]

I'm trying to extract the mg amount out of a text that looks like "92 g = 252 mg" for each cell and sum those mg amounts together, but the formula I used gives me VALUE error because of blank cells since it's supposed to be looking for "=" and "m". Do you have any suggestions? Thank you!

option1)=SUM(VALUE(MID($E$2:$E$19,SEARCH("=",$E$2:$E$19)+1,SEARCH("m",$E$2:$E$19)-1-SEARCH("=",$E$2:$E$19))))
option2) {=SUMPRODUCT(VALUE(MID($E$2:$E$19,SEARCH("=",$E$2:$E$19)+1,SEARCH("m",$E$2:$E$19)-1-SEARCH("=",$E$2:$E$19))))}

 

[Fluff]

Can you post some sample data.

MrExcel has a tool called “XL2BB” that lets you post samples of your data that will allow us to copy/paste it to our Excel spreadsheets, so we can work with the same copy of data that you are. Instructions on using this tool can be found here: XL2BB Add-in

Note that there is also a "Test Here” forum on this board. This is a place where you can test using this tool (or any other posting techniques that you want to test) before trying to use those tools in your actual posts.