All good tips - I also think people should also know how to do this manually. Don't run away scared - it's very easy! I'll give a simple example:

Here's a 1# recipe for a straight Palm Oil soap:

1 lb Palm Oil

2.16 oz Lye

4.38 oz water

Now I think this would make a rock-hard bar of soap and be pretty underwhelming but it's just an easy example. The same process here will work for any level of complexity you like. So you have this for 1# and you want to make it for 3# ... how to scale? The class clowns are saying "just multiply it by three!" which is correct, but how do you know what to multiply it by if you want 15 oz? Here's how you do it:

What do I have? 1#

What do I want? 15 oz

We take what we want and divide it by the amount we are scaled for so it's:

Original / Target = Factor (I'll explain what factor is in a moment) or 15 oz / 1 lb = Factor.

If we remember from math class (I know, me either) we know we need to have similar scales on both sides so we just have to make both weights in the same "system". 1 lb is 16 oz so the first thing we do is 15 / 16 = 0.9375. There's a lot of different ways to look at this: We want 15/16ths of a batch is one way to do it. A fraction is always a representation of division so when we do the math we find out the answer is 0.9375 so let's call it 0.94.

0.94 is our "factor" and it is also a percentage. "Percent" means "per 100" and 0.94 is 94% - the batch we want to make is 94% of the size of the original. Not too hard so far right? We can easily see how this works in the first example I gave of scaling it to 3#:

3 lb / 1 lb = 3 (or 300%)

It works no matter if it's ounces, lbs, grams, doesn't matter.

So now that we have our factor, or we know what percent we need, we need to get 94% of every ingredient. The formula, if you want to call such a simple thing a formula, is:

Original X Factor = New Weight

We do this for each line item so our 15 oz scaled recipe is figured like this:

16 oz Palm Oil X .94 = 15.04 - rounding makes this not equal to exactly 15 oz but we can round this to 15.0 oz

2.16 oz Lye X .94 = 2.0304 or just 2.0 oz

4.38 oz water X .94 = 4.1172 or 4.1 oz

That's it - the new recipe is:

15.0 oz Palm Oil

2.0 oz Lye

4.1 oz Water

In this manner you can scale any recipe to any amount you desire.

Hope that helps make it less scary.