Which PG/VG calculations are correct?

[ghh3rd]

I used one DIY EJuice calculators for a while, and recently compared it to another one and the outputs are the same, except in the VG/PG numbers. I have a feeling that the addition of water is throwing it off. Since I like to dabble with Excel, I decided to create my own calculator, and think it's right, but want confirmation.

Would anyone want to verify for me?

Here is the test recipe - no flavor added.
==================================
Nicotine Base 100 mg/ml
> PG in Nic. Base 0%
> VG in Nic. Base 100%
Target Nicotine Level 9 mg/ml
Amount to Create 10 ml
Water Added (optional) 5%
Flavor Percent 0%
> Flavor% PG 100%
> Flavor% VG 0%
Desired Total PG 40%
Desired Total VG 60%
================================
My calculator result is:
Nicotine Base 0.90 ml
Addt'l PG to add 3.80 ml
Addt'l VG to add 4.80 ml
Water 0.50 ml
Flavoring(s) 0.00 ml
Total 10.00 ml
==================================
Another calculator result is the same except for
Addt'l PG to add 3.75 ml
Addt'l VG to add 4.85 ml
==================================
Another calculator result is the same except for
Addt'l PG to add 3.50 ml
Addt'l VG to add 5.10 ml
==================================

Since it's just a little difference in the VG/PG ratio, it's not a big deal, but little things bother me

Thanks,

Granville

 

[PuffPuffPass]

Just looking at it, the last one is the only close to correct.

Your target is 60% VG. Anything less than 6ml VG is going to be under 60%. You Nic is in a VG solution, but isn't technically all VG. But it's close enough to add the .9 to the 5.1 VG and call it 6ml

The .5 water, will be counted as PG. So the 3.5ml of PG finishes the mix.

 

[ghh3rd]

Thanks for the reply - I figure that the water has something to do with the difference in calculations, and I removed water from my PG/VG equation.

I'm curious about why the water should be counted as PG?

 

[PuffPuffPass]

Water could be counted as either, since you're mixing by volume.

But to answer your question.

Water = 1 gram per ml

Water is typically used as a thinner for VG. And, the weight of water per ml is closer to PG. Those of us who use weight to mix our solutions would know/notice this.

There is a post within this forum, that breaks all this down. Mixing by weight. I'm unable to search and post a link, since I'm using mobile.

 

[PuffPuffPass]

All of this assumes you stick to the volumes you have shown us.

Your original post shows ZERO flavoring.