Double‑click measurements to instantly convert between metric and imperial units (no APIs)
UnitFlip is a lightweight userscript that lets you convert measurements between metric and imperial systems instantly without leaving the page or relying on an external service.
Simply double‑click any supported measurement, and a tooltip will appear showing the converted value. It automatically adapts to dark or light browser themes and works across all websites.
Double‑click each of these examples on any webpage:
10 km → 6.21 mi
5 ft → 1.52 m
72°F → 22.2 °C
100 mL → 3.38 fl oz
6'0" → 182.9 cm
2 ha → 20000 m²