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.

Stirrup Count

Required integer input.

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

Center Spacing Millimeters (mm)

The resulting center spacing millimeters returned as a number.

• 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 Spacing From Count

  Find equal center-to-center spacing for bars whose first and last centers span a known distance.

• Rebar Stirrup Count

  Minimum stirrup count including both ends when no center-to-center interval may exceed a user-specified maximum.

• Block Coursing Count

  Number of complete block courses that fit a wall height at the specified block-plus-bed-joint course height.