With Excel, you can create simple calculators that speed up calculations you perform frequently. Among the many calculators that you can create with Excel is one that handles the pricing of options, ...

This looks like one of those projects that started out as a glimmer of an idea and led down a rabbit hole. But it’s a pretty cool rabbit hole that leads to homebrew neon seven-segment displays on a ...

Watch me create a calculator from marbles!

CNBC Select has selected the best free budgeting tools for beginners, investors, small business owners and more. (See our ...