I built a simple online calculator for practicing basic math

I Built This
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1

Hi everyone,

I’ve been working on a small web project focused on making basic math calculations quick and easy to practice.

The idea is to keep the calculator simple rather than turning it into a scientific calculator with a large number of functions. It focuses on common operations such as addition, subtraction, multiplication, and division.

I built it as a small web project and would really appreciate feedback from other developers on the usability and implementation.

You can try the project here:

Calculadora Alicia

I’m particularly interested in feedback on the UI, mobile usability, calculation input, and whether the interface feels straightforward for someone who just wants to perform a quick calculation.

If you were building a simple calculator like this, what feature or improvement would you prioritise first?

1 Like
3

This is a fantastic concept! Keeping it simple and focused purely on core operations is an excellent approach, especially for students or anyone who just wants to avoid the clutter of a scientific layout.

Here is my feedback regarding your priority areas:

  • UI & Simplicity: The interface feels incredibly straightforward. Because there are no hidden menus or secondary function keys (like Shift or Alt), a user instantly knows how to interact with it.
  • Mobile Usability: The grid layout scales well, but on smaller screens, make sure the button tap targets are large enough (at least 48x48px) so users don’t accidentally hit the wrong number.
  • Calculation Input: If you haven’t already, make sure to listen for physical keyboard events (Enter for =, backspace, and the numpad keys). It makes desktop usability tenfold faster.

What I would prioritise first: A calculation history log. For users practicing math or doing quick consecutive calculations, being able to look up and see their last 3–5 operations right above or below the display is a massive quality-of-life improvement that doesn’t break the “simple” aesthetic.

Great job on the build, looking forward to seeing how it evolves!

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Nice work keeping the calculator simple and easy to use. I think adding a percentage calculation option could be useful for people who need to work out discounts or percentage increases without extra steps. I came across this that may be useful as a reference for this kind of feature. Great project!