Concrete Stairs Calculator

Calculate the total volume of concrete required for solid concrete stairs and landings.

Stair Geometry

Unit System

Number of Steps

Step Rise (in)

Step Run/Tread (in)

Stair Width (in)

Platform Depth (in)

Concrete Estimate

Ready for the pour?

Enter your stair specs and landing depth to calculate total concrete volume and bag counts.

Overview

Concrete stairs are durable but require careful volume calculation due to their multi-level geometry. This tool calculates the volume for each individual step (as a rectangular box) plus any top platform/landing area to give you a precise total requirement for your project.

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Pro Tips

Always include a landing if the total rise exceeds 12 feet (3.6m) to meet standard international building codes.
Use high-slump concrete for easier consolidation around the forms, but ensure adequate strength (3000+ psi / 20+ MPa).
Apply a non-slip broom finish while the concrete is still wet to ensure safety in wet or icy conditions.

Fun Facts

"Rise + Run should equal roughly 17-18 inches for comfortable stepping."
"Exterior steps should have a slight 'wash' (downward pitch of ~1%) to allow rainwater to drain effectively."
"Concrete stairs are typically reinforced with rebar in the 'throat' (the thinnest diagonal section) to prevent cracking under load."

Formula: Step Volume = (Width/12 × Run/12 × Rise/12) × (Steps × (Steps + 1) / 2); Platform = (Width/12 × Platform/12 × Steps × Rise/12)

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