Is the weather unit converter free?

Yes, completely free with no signup and no usage limits.

Does my data leave my device?

No. All conversions run in JavaScript inside your browser. Nothing is sent to any server.

Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome.

気温・気圧・風速・視程・露点など気象計測値の単位を相互変換します。

°C °F K

hPa / mbar inHg mmHg PSI

km/h mph m/s knots

km miles meters

Enter a value in any field within a group (temperature, pressure, wind speed, or visibility).
All other fields in that group update instantly to show the equivalent value.
Each group operates independently — change any value in any group at any time.

Is the weather unit converter free?: Yes, completely free with no signup and no usage limits.
Does my data leave my device?: No. All conversions run in JavaScript inside your browser. Nothing is sent to any server.
Does it work on mobile?: Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome.

Last updated: 2026-05-20 By jarvisbox