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This is a complete suite of free weather tools for converting and calculating the measurements you meet every day in forecasts, science class, sailing, aviation and gardening. Every converter works instantly in your browser, needs no sign-up, and shows the formula and a quick-reference table so you can understand the result, not just read it. Whether you need to convert Celsius to Fahrenheit, kilometres per hour to miles per hour, millimetres of rain to inches, or a barometric pressure reading between hPa, inHg and mmHg, the right tool is one tap away.
Convert between Celsius, Fahrenheit and Kelvin in any direction, and work out the heat index or wind chill to see what the temperature really feels like. These are the most-searched weather conversions in the world, useful for reading overseas forecasts, following recipes, checking a fever, or setting a thermostat.
Switch wind speed between kilometres per hour, miles per hour, metres per second and knots, and translate any speed onto the Beaufort scale to know what the wind will actually do. Essential for sailors, pilots, paraglider and drone pilots, and anyone reading a marine or aviation forecast in unfamiliar units.
Convert atmospheric pressure between hectopascals, millibars, inches of mercury, millimetres of mercury and PSI, adjust a reading to sea level, or estimate the boiling point of water at your altitude. Indispensable for comparing a home barometer against an aviation altimeter setting or an overseas weather report.
Calculate dew point and absolute humidity, judge indoor comfort, convert rainfall between millimetres and inches, and turn compass bearings into degrees or cardinal directions. Together these cover the everyday weather maths that gardeners, growers, builders and weather enthusiasts run into constantly.
These pages are calculators and converters. If you want live current conditions for your location instead — real-time temperature, humidity, pressure, wind and rain — visit the instrument pages such as the thermometer, hygrometer, barometer, anemometer and rain gauge, or head to the live weather station homepage for the full dashboard.