#### SoapAddict415

##### Well-Known Member

I hadn't thought of that. Thank you, it's worth a try.

- Thread starter Soapmaker Man
- Start date

I hadn't thought of that. Thank you, it's worth a try.

http://summerbeemeadow.com/sites/all/cgi-bin/sbm_lye_calculator_1.1.cgi

never heard of it but I'm looking forward to giving it a try! Thanks!

http://summerbeemeadow.com/sites/all/cgi-bin/sbm_lye_calculator_1.1.cgi

Sent from my Z828 using Soap Making mobile app

I just checked it. It looks like you have to go to the calculator first in order to get to the "resizer" on the next page, where you can then type in the measurements of your mold and it gives you the amount of oil needed for that mold.never heard of it but I'm looking forward to giving it a try! Thanks!

http://summerbeemeadow.com/sites/all/sbm_calc_input/calc_input_page_1.1.html

HTH

Thanks. I was trying to figure it out but I didn't get far. I'll try again after work tonight.I just checked it. It looks like you have to go to the calculator first in order to get to the "resizer" on the next page, where you can then type in the measurements of your mold and it gives you the amount of oil needed for that mold.

http://summerbeemeadow.com/sites/all/sbm_calc_input/calc_input_page_1.1.html

HTH

The .4 is actually an approximate conversion factor of any volume in cubic inches, to ounces of oils for that volume of soap. The total ounces will be the oils plus the lye and water, but Soapcalc will tell you this exactly, depending on things like superfatting and lye/water ratio. Some chemist probably figured this out way back when.hey paul, thanks for the helpful thread!!..

just curious, where does the .40 come from??

Sorry, but in metric that linked calculator has major flaws.

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??? Do you mean this one:Sorry, but in metric that linked calculator has major flaws.

I just checked it. It looks like you have to go to the calculator first in order to get to the "resizer" on the next page, where you can then type in the measurements of your mold and it gives you the amount of oil needed for that mold.

http://summerbeemeadow.com/sites/all/sbm_calc_input/calc_input_page_1.1.html

There are too many variables to successfully use another person's (or calculator's) conversion factor (especially if you don't want too little or too much); you need to calculate your own. This is how I handle this type of situation:I realize this thread was started in 2008 but I'm hoping that someone can answer my question. I've seen this formula but with different numbers such as .40, .38 & the last post suggested .37. I don't care which number I use, I can't seem to get the right amount. When I've tried for example 7 * 3.75 * 3.5 * .40= 36.75 ounces (rounded up to 37) as the amount of oils, I end up with a few ounces of too much soap. So, reasoning that the formula calculates volume/how much the mold holds, I've tried creating recipes that have a total weight of 37 oz but I usually end up a few ounces shy of a full mold. Where am I going wrong?

My current recipe yields bars that are 2.5 inches tall. Now assume that I want to increase their height to 3 inches. My conversion factor is:

New Height / Old Height

For my example above:

3 / 2.5 = 1.2

I would then scale my formula up by multiplying the weight of EVERYTHING in my formula by that number.

This also works if you want to make smaller bars. Lets say I want to scale my formula down, so that my 2.5 inch tall bars are only 1.5 inch:

1.5 / 2.5 = 0.6

I could then scale my formula down by multiplying the weight of EVERYTHING in my formula by that number.

Yes (sorry, I thought that clinking the link in my post would take you directly to your post ... it worked when I tried it. Thanks for letting me know it's not helpful!).

Test by using**grams**, enter 1000grams of olive oil at 10% superfat, and **resize** to a soap bar measuring 2cm high by 5cm long by 3cm wide. See how many grams of oil it says you need.

**Measuring mold volume without maths**

**Using salt to get the volume of your mold (and avoid all volume maths!):**

Pour salt into your desired mold, then pour the salt from the mold into a measuring jug. Read volume.

To use the multiplier from this thread (thank you!) to work out the weight of oil needed for your recipe.

For metric, multiply your volume by 0.7

For imperial, multiply your volume by 0.4

You will need to fine-tune this multiplier to suit your own recipe (as it varies with different lye strengths, additives, oils etc.)

(so in Steve's example below, his multiplier is accurate at 0.37)

**To resize your recipe to fit a new mold:**

Pour salt into your existing mold, then measure the volume of the salt. Note the volume.

Pour salt into your new mold, then measure the volume of the salt from the new mold. Note the new mold volume.

Divide your new mold volume by your old mold volume. This is your Resizer Value.

Multiply your Resizer Value by the total oil weight of your original recipe.

The answer given is the total weight of oil you need for your new mold.

In one calculation this becomes New Volume / Old Volume * Original Weight = New Weight

1/ The Resizer Value will work just as well to calculate recipe weight (by multiplying the Resizer Value by your recipe weight, instead of oil weight)

2/ The Resizer Value will work using any weight measurement (eg. grams, kilos, pounds, ounces ...)

3/ You can substitute any pourable solid for the salt. So you can use salt, rice, split peas, sand ... whatever, so long as you can pour it.

Steve's example:

Test by using

??? Do you mean this one:

Pour salt into your desired mold, then pour the salt from the mold into a measuring jug. Read volume.

To use the multiplier from this thread (thank you!) to work out the weight of oil needed for your recipe.

For metric, multiply your volume by 0.7

For imperial, multiply your volume by 0.4

You will need to fine-tune this multiplier to suit your own recipe (as it varies with different lye strengths, additives, oils etc.)

(so in Steve's example below, his multiplier is accurate at 0.37)

Pour salt into your existing mold, then measure the volume of the salt. Note the volume.

Pour salt into your new mold, then measure the volume of the salt from the new mold. Note the new mold volume.

Divide your new mold volume by your old mold volume. This is your Resizer Value.

Multiply your Resizer Value by the total oil weight of your original recipe.

The answer given is the total weight of oil you need for your new mold.

In one calculation this becomes New Volume / Old Volume * Original Weight = New Weight

1/ The Resizer Value will work just as well to calculate recipe weight (by multiplying the Resizer Value by your recipe weight, instead of oil weight)

2/ The Resizer Value will work using any weight measurement (eg. grams, kilos, pounds, ounces ...)

3/ You can substitute any pourable solid for the salt. So you can use salt, rice, split peas, sand ... whatever, so long as you can pour it.

Steve's example:

L x W x H = volume

Trish,

If you calculate in metric (cm) then multiply volume by 0.70 for the weight of oils that will fit.

If you calculate in inches use 0.37 for the weight of oils.

Some corrections will need to happen because of additives but this get me real close.

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Didn't we also screw up some mission or other trying to convert between the two?Metric? What the hell is that?

Just remember we put men on the moon with good ol Imperial measurements.

I sure like math using metric measurements better, but I still don't know what to expect out of C ... like, what's comfortable? I know 70F is fine but remembering 21C is comfortable eludes me most times.

You're joking, right? Um, in architecture & engineering, we use mostly metric -- just like soapers prefer to use grams for lotions & potions. I s'pose NASA did too. The interesting thing back then is, when JFK was elected President of the USA, he promised we would land on the moon in 10 years. He also promised that, in those same in 10 years, we would be on the metric system! Maybe that's why he was assassinated?! (Just kidding.)Just remember we put men on the moon with good ol Imperial measurements.

Americans are resistant to change, even if it's good for us. I'm embarrassed that we are the only "civilized" country in the world that still uses the Imperial system. Sad really and, dare I say, ignorant... in a nice way of course.

I thought Great Britain used Imperial measures for a lot of things?

Actually, zany, NASA did use a lot of Imperial at that time. Even the lunar module coming down was measuring the distance to landing in feet

Anyway, doing this for the same mold I used yesterday works better for me if I used .42 instead of .40. If I would have done this yesterday I would have lost less then 2.46% because that would have put me a little more then a 1/4 oz closer to my target.

To make it short, .42 works much better and is closer to the top of the mold in my opinion. I'm like the other guy here, "What is .40?"

At least thanks to whoever worked it out first time round, you had a ball park figure to start with, even if they didn't make it totally perfect for your particular batch of soap