Concrete Bags
“How many bags for my fence posts?”
How many bags for your fence posts, from the yields the manufacturers actually publish — and the hole size the real standard asks for, which is wider than the rule everyone quotes.
- Bag yields quoted from Quikrete, Sakrete, Blue Circle, Tarmac and Heidelberg
- Checks your hole against ASTM F567-23, which nobody quotes correctly
- Quotes your brand's own dry-pour instructions, because they contradict each other
- Takes the post's own volume out of the hole, which is where people over-buy
- Metric or imperial, fence posts or a slab
- This one is finished and tested — not on the build list
- It will be $9, same as every other tool
- One email when it goes up, no list, no spam
Three steps, then you're done
Or tap a preset built to the standard.
The yields differ by about 11%.
And read what the maker says about mixing it.
Questions
Do I need to install anything?
No. Each tool is a single file. Double-click it and it opens in Chrome, Edge, Safari or Firefox — whichever you already have. No account, no password, no software.
Does anything get uploaded?
No. Your numbers and files never leave your computer — the tools have no way to send them and no internet connection is needed to run them. You can switch your wi-fi off and they still work.
I'm not good with computers. Is this too hard?
The first thing every tool does is walk you through it in five short screens with pictures. Then there's a button that fills it with example numbers so you can watch it work before touching anything.
Will it work on my phone?
Yes. Email yourself the file and open the attachment, or drop the files in iCloud Drive, Dropbox or Google Drive and open them from there — then they're on every device you own.