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

Structural Beam Load Calculator

Estimate the load-bearing stiffness of a simply supported structural beam based on its span, cross-section, and material. Use this when sizing floor joists, headers, or steel beams for construction projects.

Beam Length (ft)

Moment of Inertia (in⁴)

Elastic Modulus (psi)

Support Type

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Civil

Storm Water Drainage Calculator

Estimate peak stormwater runoff and determine the minimum pipe diameter needed to handle it. Used by civil engineers and drainage designers when sizing pipes for subdivisions, roads, or urban catchments.

Catchment Area (hectares)

Design Rainfall Intensity (mm/hr)

Runoff Coefficient

Pipe Slope (%)

Manning's Roughness Coefficient

Fill in the required fields to see your result.

Key differences

	Structural Beam Load Calculator	Storm Water Drainage Calculator
Category	Civil	Civil
Inputs required	4	5
Result	Maximum Uniform Load (lbs/ft)	Required Pipe Diameter (mm)
What it does	Estimate the load-bearing stiffness of a simply supported structural beam based on its span, cross-section, and material. Use this when sizing floor joists, headers, or steel beams for construction projects.	Estimate peak stormwater runoff and determine the minimum pipe diameter needed to handle it. Used by civil engineers and drainage designers when sizing pipes for subdivisions, roads, or urban catchments.