Weather & Environment

Calculate environmental metrics — dew point, heat index, and wind chill.

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7 tools

Heat Index Calculator

Calculate the heat index (feels-like temperature) based on air temperature and relative humidity or dew point. Uses the National Weather Service regression equation for accurate results.

Wind Chill Calculator

Calculate the wind chill temperature based on actual air temperature and wind speed using the standard wind chill formula.

Dew Point Calculator

Calculate dew point temperature, relative humidity, or air temperature. Free online dew point calculator with multiple temperature units.

Cloud Base Calculator

Estimate cloud base altitude from surface temperature and dewpoint using the standard meteorological formula.

Rainwater Collection Calculator

Calculate rainwater harvest volume, catchment area, rainfall depth, and collection efficiency. Free online rainwater harvesting calculator for home and farm.

Relative Humidity Calculator

Calculate relative humidity, dewpoint temperature, actual vapor pressure, and saturated vapor pressure using the Magnus formula. Free online humidity calculator.

Snow Melt Calculator

Calculate snow melt depth, heat capacity, heat content, and heat storage change for meteorology and hydrology. Solve for any variable.

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Frequently Asked Questions

Straight answers about how Online Mini Tools works.

Are the tools on this website free to use?

Yes, all tools hosted on our website are completely free to use. We believe in providing convenient and useful utilities without any hidden costs or paywalls.

Do I need to create an account to use the tools?

No, you do not need to create an account. Our tools are accessible to everyone visiting our website instantly, without registration or login.

Can I suggest new tools or features?

Absolutely! We welcome suggestions for new tools or features that would benefit you. Please reach out to us at [email protected].

Are the results generated by these tools accurate?

We strive to ensure absolute accuracy in our tools. However, results are determined by the input data provided. We always recommend verifying critical calculations for professional or legal applications.

Are my inputs and results private and secure?

Yes, privacy and security are fundamental. Processing happens entirely client-side on your browser for most tools, and we do not store, view, or log any of your inputs, data, or results.

Are these tools compatible with mobile devices?

Yes, our layout is mobile-first. Every tool adapts beautifully to smartphones, tablets, laptops, and wide screen monitors.

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