@Vapemakingnoob it’s generally better to measure by weight, not volume, because ambient temperature doesn’t affect weight and when measuring small quantities weight is much more accurate than volume (unless you have expensive grade A graduated cylinders with +/- 1 mL accuracy).
If you want to convert from weight to volume, divide the weight by the product’s specific gravity (density). You can find the specific gravitates in each product’s COA. If you haven’t seen our Mixing Terpenes webpages you may want to check them out (includes a calculator).
There is discussion about cutting BHO and shatter in these threads too: