Calculator tools

Move one slider and the math tells you when buying beats renting.

Desmos.com's calculator is a great tool for anyone in high school or university who is studying any subjects related to maths. The online graphing webpage will take any function you give it and display a clean graph. You can zoom in and out of the graph as much as you want and there is a helpful mathematical keyboard at the bottom of the screen to input more complex function symbols.

A free rent vs buy calculator that actually shows its math instead of just telling you the answer. See the full breakdown of costs over time.

A massive free online toolkit with 200+ tools: PDF editor, image converter, text tools, unit converters, calculators, developer utilities, SEO tools, and more. All browser-based, no signup needed.

Computational knowledge engine — solve equations, plot functions, convert units, look up chemical compounds, analyze data. Like Google but for computation.