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

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

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.

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.

Cost of living comparison calculator for cities worldwide.