- Thread starter wbocrafter
- Start date

Thank you for picking that up. I erroneously entered lard 2 times. I came up with the 1032 grams of water by filling the molds I want to use with water & then pouring the water into a measuring cup. I got about 5 c. Water. I thought I needed to convert it to grams so that everything was in grams. Does this make any sense? I forgot to enter that I was using 7% castor oil & 23% coconut oil, not as I originally posted.

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The amount of lye required will vary depending on what combination of oils/butters you choose . . . that's why double-checking recipes with a lye calculator is so important. I like soapee.com and soapcalc.net for formulating recipes but there are plenty of others available. I would select the default superfat of 5% and a lye concentration of 30% like my example below.

The soap calculator will usually complain if your oil percentages don't total up to 100%. You can select different combinations of oils to see how the recipe properties and fatty acid profiles change.

I just ran your recipe through my soap calculator and it appears that it should be everything you specified you wanted. Good job there. To figure out how much water and sodium hydroxide you need, you must learn how to use a soap calculator. This is vital for safety! Try soapcalc.net or google "Soap Calculator".

thanks so much.

http://www.soapmakingforum.com/showthread.php?t=2909

Basically you measure your mold dimensions in inches (Length, width, height), multiply those three numbers together, which gives you the volume in cubic inches. Then take that number and multiply it by .4. That's how much oil you need in ounces. It works really well.

So in your case, you have a volume of 1032 cubic centimeters(since you used water and grams). Converting that to cubic inches gives you just under 63 cubic inches. So 63 X .4 = 25.2 ounces of oil.

Now if you use Soapcalc, step two asks you what the weight of your oils is. Put 25 in there, fill out the rest, and your mold will be filled nicely.

http://www.soapmakingforum.com/showthread.php?t=49627

But .7 is easier to remember and is close enough.

So 1032 X .7 = 722 grams of oil

Is the thread for mold volume calculations. Ounces use the same formula as gdawgs BUT with a correction of 0.40. Both formulae consider that you will be using "full water".

One of the other things that a lye calculator does is show the approximate properties of the recipe. This helps me to not make a soap that will require an extremely long cure period just to be "ick why did I do this".

I may have added confusion there with the second post.

Is the thread for mold volume calculations. Ounces use the same formula as gdawgs BUT with a correction of 0.40. Both formulae consider that you will be using "full water".

.4 is for converting cubic inches of mold volume to ounces of oil needed.

.7 is for converting cubic centimeters of mold volume to grams of oil needed.