Beam Rebar Calculator

Estimate the steel in a beam. Enter the beam size and span, the number of top and bottom bars, and the stirrup spacing — the tool returns main steel, stirrup steel and the total weight.

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How to use: Beam Rebar Calculator

Enter beam length and cross-section.
Set the number and size of top and bottom bars.
Set stirrup spacing and bar size.

Formula

Main steel = (top + bottom bars) × length × kg/m. Stirrups = floor(length ÷ spacing) + 1 at the stirrup cutting length.

See the full rebar weight chart (kg/m & lb/ft) →

Beam Rebar Calculator — FAQ

How do you calculate beam reinforcement?

Add the main bar weight to the stirrup weight along the beam length.

What is the spacing of stirrups in a beam?

Often closer near supports; commonly 100–200 mm — design governs.