# [Online Calculators and Tools](https://blog.hirnschall.net/tools/)

author: [Sebastian Hirnschall](https://blog.hirnschall.net/about/)

meta description: Free online calculators for electronics and physics — solve for any unknown given the other variables. Symbolic FSAE solver, and more.

meta title: Free Engineering Calculators — Electronics & Physics

date published: 01.01.2025 (DD.MM.YYYY format)
date last modified: 03.04.2026 (DD.MM.YYYY format)

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Introduction
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Many projects/exercises require the same simple calculations over and over again. We want to provide a collection of simple online calculators that can solve for any unknown given that the user provides all but one unknown. Furthermore, each page includes a section about the problem itself and which formula we use to solve for which unknown.

If you want more information, check out our blog at [blog.hirnschall.net](https://blog.hirnschall.net)

Table of contents
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Use the links below to jump to the tool you are interested in:

### 1   Capacitors

* [Parallel plate capacitor](https://blog.hirnschall.net/parallel-plate-capacitor/)

### 2   Formula Student (FSAE)

* [A symbolic VD and Aero equation solver built on reusable physics models](https://blog.hirnschall.net/everything-aero/)