Here's an even easier calculator. I use 18 gauge 5 ml syringes to measure my ingredients. Just fill in the top section and the bottom fills in by itself. Hope this helps.
Only problem with this is it also does not allow zero nic mixing, and the water is based on the total mix amount rather than just the VG to be added which is the only reason you should add water. But for a straight PG mix wanting to figure nic strength and flavoring it is the easiest.
Good job.
Attached is a no-nic calculator that can be used for VG or PG.
*Note* when using water field, the water % is based on the total amount of VG being used. Hope this helps the no-nic people out there.
I added two screen shots so you can see you can use it for VG or PG no-nic mixes.
Dan