Interval & Set-Builder Notation Converter

Convert a real-number interval between inequality form (a < x < b), interval notation ([a, b), (−∞, 5]), and set-builder form ({x ∈ ℝ : a < x < b}) — and plot it on a number line. Handles open/closed endpoints, infinities, and unions of two intervals. Pure arithmetic and text, runs locally in your browser.