Yep, you can have a number field in your Gear table where you enter the weight of an item in kg.

Then in your Shoots table, I presume you have a linked record field where you are linking your Gear for a shoot. In addition to that linked record field, you’ll need a Rollup field that Rolls up:

Linked Record Field:   Gear

Field to Rollup:       Weight

Rollup Function:       SUM(values)

That Rollup field will give you the total weight of all the Gear you have selected for the Shoot.

Wow, thank you so much! Is there any way that I can have kg or grams added to the sum ?

Thank you!

I’m not entirely sure if this will work, but you could try putting this in the Rollup Function:

SUM(values) & " kg"

Thank you, really appreciate it!!