Unit and time-zone converters
How to use
Convert length, mass and temperature with exact definitional factors, and convert a local time between IANA time zones. Everything runs in your browser; nothing is uploaded.
Length, mass and temperature
Time zones
Pick two IANA zones and a local date/time in the “from” zone. Conversion uses
Intl only (no network).
Notes
- Length uses the international inch (exactly 0.0254 m). Mass uses the avoirdupois pound (exactly 0.45359237 kg). Temperature uses °C ↔ K (±273.15) and the usual °F affine map.
- Time-zone results follow the browser’s IANA data (DST included). Ambiguous civil times near a fall-back transition use the engine’s interpretation.