About
Calculate anything with
Pick a formula, enter the variables you know, leave one blank, click Calculate, and the solver finds your solution in any units, with the algebra and unit conversions shown for reference.
Every formula solver pairs its calculator with a learning zone: what the formula means, where it came from, and how it's used in the field. I built it for students, trades, and the curious experts.
The story
I first imagined this site in 2011, while studying in a chemical engineering program. I found that understanding the formulas in any class was the easiest way to understand the course; the formula speaks volumes in helping to understand the theory. But the long multi-step problems, with their mixed units, their surface areas, their little carried values, and their physical constants, kept ending the same way: a table full of classmates comparing several different answers, none of us able to say whose was right.
I wanted a site that would settle the question. Enter what you know, leave one variable blank, and see the answer with the work shown, so the debate could end and the learning could carry on.
Building it took longer than imagining it. I taught myself HTML, CSS, and PHP from scratch, through online courses, eBooks, formal examples, and a great deal of trial and error, never entirely certain I was headed in the right direction. A first version took shape in 2011, and several more followed, each one sinking into the “now updated” development environments rather than the application I actually wanted to write. The project went cold more than once, set aside for children, for work, for a life's worth of commitments. It never stopped being a passion.
Then, in 2026, building with Claude finally made the coding as fast as the thinking, and a working version came together in under a day, larger than anything I had sketched across fifteen years of imagining it. It will keep growing from here. And here it is, at last: for students, for trades, for anyone curious enough to want the work shown, and for my own kids, who will grow with it.
Sponsored by my business, HYDRONIC Water Treatment.