Use this construction calculation for preliminary quantity, geometry, material, load, or coverage planning when dimensions and units have been measured consistently.

Cage Length Millimeters (mm)

Required number input.

Max Spacing Millimeters (mm)

Required number input.

Minimum stirrup count including both ends when no center-to-center interval may exceed a user-specified maximum. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Stirrup Count

The resulting stirrup count returned as an integer.

• A quantity estimate or simplified engineering formula is not a building-code check, stamped design, manufacturer approval, or site inspection. Material properties, tolerances, waste, moisture, workmanship, loads, local conditions, and code requirements can change the result.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Verify dimensions on site, use current product data and local code requirements, include an explicit waste or safety allowance where appropriate, and obtain qualified structural, electrical, plumbing, or geotechnical review when required.

• Rebar Chair Spacing

  Count support chairs along one rebar line including both ends, with no gap exceeding the chosen maximum spacing.

• Floor Squeak Screw Count

  Number of equally spaced fastening positions along one measured floor-joist run, including both ends, for a supplied maximum spacing.

• Rebar Stirrup Spacing

  Equal center spacing when a selected number of stirrups spans from first to last center over a specified cage length.