to make and just so you know, he was also using the concrete in the wheelbarrow for two projects that day.
one way to measure the concrete mix would be to fill up the mold with the dry concrete mix and then add in some more for good measure. it's a starting point at least. just use the mold as a measuring tool; don't actually mix your concrete in it. use a bucket or wheelbarrow. just not anything that you want to keep nice.
please note: we forgot to get pictures of us pouring the concrete mix into the mold. but just so you know, we filled the mold about one third 