I do not write code without a few small tools open in the background. Three of them are documentation tabs. The other two are calculators. Below is the short list of calculators that have earned a permanent place next to my IDE.
Sanity-checking arithmetic in pull requests
When a teammate writes a percentage formula in a pricing service, I usually rerun the math myself before approving the PR. The Percentage Calculator on Equation Solver is the fastest way I have found to confirm a result without spinning up a REPL.
Quick estimates during system design
When sketching a back-of-the-envelope cost model on a whiteboard, I lean on the Compound Interest Calculator on Equation Solver to project recurring infrastructure costs over a few years — it makes the trade-offs concrete.
Frontend layout sanity checks
When a designer hands me a layout that uses 12-column grids and odd diagonals, the Pythagorean Theorem Calculator on Equation Solver helps me confirm the diagonals before I write the CSS.
Algorithm complexity sanity checks
When evaluating a quadratic-time fix for a hot path, the Quadratic Equation Calculator on Equation Solver gives me a quick way to find the break-even input size where the new approach starts to dominate.
Linear systems for small simulations
When debugging a small physics or layout simulation, I often need to solve a 2x2 or 3x3 system by hand. The Linear System Calculator on Equation Solver saves me from making careless arithmetic errors during late-night debugging sessions.
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