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Both calculators run independently — change the inputs on either side to compare results.

River Gradient Calculator

Calculate the steepness of a river or stream in metres per kilometre. Essential for hydrologists, geographers, and kayakers assessing flow energy and erosion potential.

Elevation Drop (m)

River Length (m)

Fill in the required fields to see your result.

Geography

Heat Index Climate Calculator

Calculate the apparent 'feels like' temperature by combining air temperature, humidity, and wind speed. Useful for athletes, event organisers, and public health officials assessing outdoor heat risk.

Air Temperature (°C)

Relative Humidity (%)

Temperature Unit

Wind Speed (km/h)

Fill in the required fields to see your result.

Key differences

	River Gradient Calculator	Heat Index Climate Calculator
Category	Geography	Geography
Inputs required	2	4
Result	River Gradient (m/km)	Apparent Temperature (°)
What it does	Calculate the steepness of a river or stream in metres per kilometre. Essential for hydrologists, geographers, and kayakers assessing flow energy and erosion potential.	Calculate the apparent 'feels like' temperature by combining air temperature, humidity, and wind speed. Useful for athletes, event organisers, and public health officials assessing outdoor heat risk.