Reverse calculation when using a pre-mix

[Daveredding]

Firstly, Hi to everyone on the forum.

My first post, so be gentle.

I have been mixing for a while now and do the same every time and stick with the same flavour which I enjoy.

I use VG and PG seperately. I mix 70vg/30pg. Nicotine is VG 72mg and target strength is 3mg. I use PG flavour at 20%. This works perfectly and I love the Shisha Strawberry Flavour concentrate.

Now to the Maths.

I have just been given a gallon of premixed base. at VG70/30PG. Its the same manufacturer, but I am struggling to work out how to achieve what I mix already.

Is there a simple calculator, or can someone do the maths for me. I have searched forums and only found scubabatdans helpfull spreadsheet, but still couldnt work it out.

Just having one of those Brain not working days.

Many Thanks in advance

Dave

 

[somdcomputerguy]

If you have a Windows PC and want to install this calculator, it may help..
eJuice Me Up - Best eJuice Calculator
You can try these online calcs too. I haven't used the e-liquid calc on the second one, but I use several of the other calcs there a lot.
Do It Yourself E-Liquid (E-Juice) Recipe Mixing Station!
Steam Engine main page

 

[Izan]

You will need to add a bit of VG if you want to maintain the 30% PG ceiling.
I mix the INA Shi/straw at 5%, the 20% you are using should produce a VERY strong flavour.

Use one of the calculators mentioned above.

Cheers
I

 

[BrotherBob]

Firstly, Hi to everyone on the forum.
My first post, so be gentle.
I have been mixing for a while now and do the same every time and stick with the same flavour which I enjoy.
I use VG and PG seperately. I mix 70vg/30pg. Nicotine is VG 72mg and target strength is 3mg. I use PG flavour at 20%. This works perfectly and I love the Shisha Strawberry Flavour concentrate.
Now to the Maths.
I have just been given a gallon of premixed base. at VG70/30PG. Its the same manufacturer, but I am struggling to work out how to achieve what I mix already.
Is there a simple calculator, or can someone do the maths for me. I have searched forums and only found scubabatdans helpfull spreadsheet, but still couldnt work it out.
Just having one of those Brain not working days.
Many Thanks in advance
Dave

Welcome and glad you joined. Math can be tricky, might like to do the math on Steam Engine and check the results on another calculator. If you are not too sure of what you are doing, it's always best to double check.
Could check this site for more definitive percentages:
http://..................../flavor/25089
My calculator:
E-Liquid Calculator Ten Flavors with PG/VG Adjusting

 

[Daveredding]

If you have a Windows PC and want to install this calculator, it may help..
eJuice Me Up - Best eJuice Calculator
You can try these online calcs too. I haven't used the e-liquid calc on the second one, but I use several of the other calcs there a lot.
Do It Yourself E-Liquid (E-Juice) Recipe Mixing Station!
Steam Engine main page

I have always used the ejuice me up calculator, but again, cannot figure out when starting with a base that is pre mixed 70/30. Will sleep on it and revisit tomorrow. Many Thanks

 

[Train2]

Should be straightforward in EJuicemeUp...

 

[Izan]

Yeah... What @Train2 said

Just plug in your starting mix (it's all premix).

Cheers
I

 

[Train2]

Or wait - do you mean it's premixed down to 3 mg?
Then there's no way to add flavor and stay at 3 mg...or are you trying to use SOME that's 3mg and a little that's 72mg so that you DO still land at 3 mg?
That IS tricky - but can be done.

You might, for instance, mix your bases (72 and 3) and create some mid-range starting point blend to work with for a while. For this, EJuiceMeUp has a "Nic Combine" under "Tools" and you could for instance mix up a batch of

to use as you STARTING nic for the next couple batches?
Just an idea - if you do something like this, make sure to LABEL EVERYTHING so you know what's 3, what's 72 and what's your own premix-mix...

 

[Leo Bak]

Your 72mg VG is targeted to be 3mg/ml.
Add 23 parts to 1 part of nic-base.
You then have a total of 24 parts.

If you use 20% PG flavours, that makes 4.8 parts.
Your vg-nic is 1 part.
Total of 5.8 parts. Leaves 18.2 parts.

If you want to use the premixed 70/30 you get this ratio:
70% of 18.2 parts = 12.74 parts of vg
30% of 18.2 parts = 5.46 parts of pg

You then have a total of:
13.74 parts of vg = 57.25%
10.26 parts of pg = 42.75%

Not even close to 70/30, meaning you'll have to add extra vg. That's why i never use premixed base.

 

[amoret]

I use JuiceCalculator https://www.e-cigarette-forum.com/forum/threads/new-calculator-to-try.480587/unread and there you can set up your new new mix as an ingredient, where you can specify vg and pg and nicotine if it has any. Then just put it into your recipe and the calculator will figure the rest out.

 

[Daveredding]

Should be straightforward in EJuicemeUp...

View attachment 626929

Now its getting even more confusing. I can see what your saying. But the base has no nicotine.

Your 72mg VG is targeted to be 3mg/ml.
Add 23 parts to 1 part of nic-base.
You then have a total of 24 parts.

If you use 20% PG flavours, that makes 4.8 parts.
Your vg-nic is 1 part.
Total of 5.8 parts. Leaves 18.2 parts.

If you want to use the premixed 70/30 you get this ratio:
70% of 18.2 parts = 12.74 parts of vg
30% of 18.2 parts = 5.46 parts of pg

You then have a total of:
13.74 parts of vg = 57.25%
10.26 parts of pg = 42.75%

Not even close to 70/30, meaning you'll have to add extra vg. That's why i never use premixed base.

You got it. The base is a flat 70/30 VG/PG. It has no nicotine. So by adding in my VG Nicotine, it pushes the VG up (Nicotine is 100% VG @ 72%) so when your putting it into the ejuiceme up calculator as 70/30 as the nicotine strength ejuice, its not actually correct. It is marginal, so I will just use those figures as a guide and reduce nicotine slightly. MAny Thanks to Everyone.

 

[Sugar_and_Spice]

Now its getting even more confusing. I can see what your saying. But the base has no nicotine.


You got it. The base is a flat 70/30 VG/PG. It has no nicotine. So by adding in my VG Nicotine, it pushes the VG up (Nicotine is 100% VG @ 72%) so when your putting it into the ejuiceme up calculator as 70/30 as the nicotine strength ejuice, its not actually correct. It is marginal, so I will just use those figures as a guide and reduce nicotine slightly. MAny Thanks to Everyone.

Personally, I would just add my nic and flavoring at what you normally use and then add the remaining ml's premix. ie.

30ml bottle @ 3mg = 1.25 ml
6 ml flavoring = 20%
So you have used 7.25ml in your 30 ml bottle.
So just add 22.75 ml of your premix.
The small amt of vg in your nic you will never notice. And will help to offset the pg just a little

Of course, if you are using larger or smaller bottle it is easily adapted.


Just my 2 pennies.

 

[Leo Bak]

Nicotine is 100% VG @ 72%

I might hope it's 72mg, not 72%.

 

[Leo Bak]

So by adding in my VG Nicotine, it pushes the VG up

It does, but because you use a lot of pg-flavour, the pg is pushed up even more, changing the 70/30 ratio to 57.25/42.75.

 

[Daveredding]

Thanks Everyone. Just doing my first batch. Help is so appreciated.

 

[zoiDman]

Thanks Everyone. Just doing my first batch. Help is so appreciated.

Hi Daveredding.

One thing that you will probably Learn after doing DIY for a little bit is that sometimes there Isn't a Difference between what the Numbers are and what you can Exactly Taste.

Meaning, if you are Targeting 3mg/ml @ 70VG/30PG and your mix come out to 2.7mg/ml @ 65VG/35PG or 3.2mg/ml @ 74VG/26PG, you probably will Not be able to Taste the Difference.

So I wouldn't get too Bogged Down in trying to make the Numbers come out Perfectly.

It's Cool to do things with a Very High Degree of Numerical Accuracy. But when the Level of Accuracy Exceeds what a person can Taste, then that Level of Accuracy Isn't Needed.

And Many Times DIY can be made So Much Simpler if the Choice of Target Numbers is a little Flexible.

 

[Leo Bak]

Hi Daveredding.

One thing that you will probably Learn after doing DIY for a little bit is that sometimes there Isn't a Difference between what the Numbers are and what you can Exactly Taste.

Meaning, if you are Targeting 3mg/ml @ 70VG/30PG and your mix come out to 2.7mg/ml @ 65VG/35PG or 3.2mg/ml @ 74VG/26PG, you probably will Not be able to Taste the Difference.

So I wouldn't get too Bogged Down in trying to make the Numbers come out Perfectly.

It's Cool to do things with a Very High Degree of Numerical Accuracy. But when the Level of Accuracy Exceeds what a person can Taste, then that Level of Accuracy Isn't Needed.

And Many Times DIY can be made So Much Simpler if the Choice of Target Numbers is a little Flexible.

Totally agree with you, however i do sense the difference between 70/30 and 57.25/42.75 by both the amount of clouds and extra sweetness caused by VG base. 70/30 vs 65/35 however i might not notice. @Daveredding has a gallon of the premixed 70/30 base, 4.5 liter with 20% flavour added. That would take me almost a year to vape, i'd get some extra VG if i were him.

 

[zoiDman]

Totally agree with you, however i do sense the difference between 70/30 and 57.25/42.75 by both the amount of clouds and extra sweetness caused by VG base. 70/30 vs 65/35 however i might not notice. @Daveredding has a gallon of the premixed 70/30 base, 4.5 liter with 20% flavour added. That would take me almost a year to vape, i'd get some extra VG if i were him.

What would be Funny is if the OP Liked 57.25VG/42.75PG better than 70VG/30PG.

LOL

 

[DaveP]

ZoidMan said: What would be Funny is if the OP Liked 57.25VG/42.75PG better than 70VG/30PG.

LOL

Every once in a while I get distracted and stop watching the scale for a few seconds as I pour the VG and end up a little hot on the VG component. I can always tell which bottle it happened on later while it's steeping. It's the one that's more full than the others! That one will be the one that makes bigger clouds, too.

Heck, what's an extra 10%, anyway (unless it's nic or maybe flavoring).

So, I get to blow bigger plumes once in a while ...

There's probably something to be said about using syringes for mixing. You get to examine the ml count on the side of the syringe before you dump it in!