Formula Calculators provides free online calculators for engineers, students, and hobbyists. These calculators solve problems from a variety of areas, such as electrical and control theory. I created these free online calculators because they are useful to me in my work, and I wanted to make them available to everyone else. Each calculator page includes the formulas used and example problem walkthroughs. I hope that using these calculators saves you time, and the included educational materials help so that you don’t have to trust an online calculator blindly.

I put a lot of effort into making these calculators accurate, intuitive, and easy to use. All of them should just let you start entering what you have and automatically fill in the rest. Please let me know if you find any mistakes, if there are any suggested improvements, or if you would like to request a new calculator. If you find these calculators useful, consider buying me a coffee!