Compare calculators

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

Geographic Area Calculator

Calculate the area of rectangular, circular, or triangular regions in square kilometers, square miles, or hectares. Useful for land measurement, urban planning, and geographic comparisons.

Shape Type

Length/Width (km)

Width/Height (km)

Radius (for circle) (km)

Output Unit

Fill in the required fields to see your result.

Geography

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.

Key differences

	Geographic Area Calculator	River Gradient Calculator
Category	Geography	Geography
Inputs required	5	2
Result	Area	River Gradient (m/km)
What it does	Calculate the area of rectangular, circular, or triangular regions in square kilometers, square miles, or hectares. Useful for land measurement, urban planning, and geographic comparisons.	Calculate the steepness of a river or stream in metres per kilometre. Essential for hydrologists, geographers, and kayakers assessing flow energy and erosion potential.