Weather Unit Converters

Forecasts mix unit systems depending on where they come from. These converters cover the units that show up on weather pages, with exact formulas and reference tables.

• Celsius to Fahrenheit Converter°C · °F · K°F = °C × 9/5 + 32
• Wind Speed Converterkm/h · mph · m/s · kn · Beaufort1 km/h = 1000 / 3600 m/s ≈ 0.27778 m/s
• Rainfall Convertermm · cm · ininches = mm ÷ 25.4
• Air Pressure ConverterhPa · mb · inHg · mmHg1 hPa = 1 mb = 100 Pa

Looking for how the weather feels rather than a unit swap? The weather calculators work out wind chill, heat index, dew point, wet-bulb and feels-like temperature.