Theater Seating Sightline & Riser Estimate

What this estimates: enter screen-bottom height, eye position, row spacing and a conservative head-plus-clearance allowance. The result is sightline geometry, not a structural platform design.

Method. Similar triangles solve the required eye height for each rear row, recursively using the raised row in front.

Example. Raising one row changes the obstruction for the next, so a three-row design cannot safely multiply one generic riser height.

The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.

Number of rows

3

First row from screen

3 m

Row spacing

1.1 m

Seated eye above floor

1.05 m

Head above eye

0.15 m

Screen bottom height

0.65 m

Sightline clearance

0.1 m

Primary result: Rear-row sightline height estimate: 1.04 m.

• Measure from the datum or reference edge described by this tool, and do not mix inside, outside and centerline dimensions.
• Keep inputs in the displayed units and preserve more precision than the final cutting or purchasing tolerance requires.
• When the result is close to a limit, verify it with a test piece, field measurement, manufacturer drawing or qualified project professional.

This is a sightline model, not structural or code design. Recliners, varied occupant heights, aisle steps, guardrails, ceiling clearance, accessibility, joists, loads and local building/fire codes require qualified design and approval.