Polar ↔ Cartesian Converter

Convert points between polar (r, θ) and Cartesian (x, y) coordinates, with a live plot. Enter either form and the other is computed instantly. Supports degrees and radians, and multiple points at once. Pairs with the Vector Calculator, Complex Number, and Trigonometry tools. Everything runs locally in your browser.

Polar input (r, θ) — one per line

Cartesian input (x, y) — one per line

Polar → Cartesian: x = r·cos(θ), y = r·sin(θ). Cartesian → Polar: r = √(x² + y²), θ = atan2(y, x). Negative r reflects through the origin. Pairs with the Vector Calculator and Complex Number tools. Runs locally.