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Best Free Weather & Atmospheric Calculators

Get the real feel of the weather with the standard formulas. Calculate heat index, wind chill, dew point, humidity, wet bulb temperature, cloud base and air density, and check the Beaufort and hurricane scales. Free and private, right in your browser. All 21 tools below are free, run in your browser, and need no sign-up.

Heat Index CalculatorEnter air temperature and relative humidity to find how hot it really feels.Wind Chill CalculatorEnter temperature and wind speed to find the wind chill temperature.Dew Point CalculatorEnter temperature and relative humidity to find the dew point and comfort level.Feels Like Temperature CalculatorCombines heat index in warm weather and wind chill in cold weather to show the real apparent temperature.Relative Humidity CalculatorEnter air temperature and dew point to find the relative humidity using saturation vapor pressure ratios.Absolute Humidity CalculatorEnter temperature and relative humidity to find grams of water vapor per cubic meter of air.Wet Bulb Temperature CalculatorEnter air temperature and relative humidity to find the wet bulb temperature.Wet Bulb Globe Temperature CalculatorFree WBGT calculator estimating outdoor wet bulb globe temperature from air temperature, humidity and sun to gauge heat stress risk zones.Cloud Base Height CalculatorEnter surface temperature and dew point to estimate the height of cumulus cloud bases.Snow to Water Ratio CalculatorConvert snowfall depth to liquid water equivalent, or water to snow, using the ratio for your snow type.Beaufort Wind Scale ReferenceEnter a wind speed to find its Beaufort force number, name and the sea and land effects that go with it.Saffir-Simpson Hurricane Scale ReferenceEnter sustained wind speed to find the hurricane category and its expected damage.Air Density CalculatorEnter temperature, pressure and humidity to find moist air density in kilograms per cubic meter.Frost Point CalculatorEnter temperature and relative humidity to find the frost point, the temperature at which frost forms on surfaces.Rainfall Volume CalculatorEnter rainfall depth and a roof or catchment area to find the total water volume collected in liters and gallons.Growing Degree Days CalculatorEnter daily high and low temperatures and a base temperature to find GDD accumulation for crop growth.Pressure Altitude CalculatorEnter field elevation and the altimeter setting to find pressure altitude for aviation performance planning.Density Altitude CalculatorEnter pressure altitude and temperature to find density altitude and gauge aircraft and engine performance loss.UV Index Reference and Burn TimeEnter the UV index and your skin type to see the risk level, protection advice and estimated time to sunburn.Humidex CalculatorEnter air temperature and dew point to find the humidex and how hot it feels with humidity.Lightning Distance CalculatorEnter the seconds between a lightning flash and thunder to find how far away the storm is and if it is a threat.

Frequently asked questions

Are these tools free?

Yes. Every tool in this toolkit is completely free, with no sign-up and no usage limits.

Do these tools work on mobile?

Yes. They run in any modern web browser on phone, tablet or desktop, with nothing to install.

Is my data private?

Yes. These tools run entirely in your browser, so nothing you enter is uploaded to a server.

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