Architecture

Sight Line Calculator

The C-value measures the vertical distance between the eye level of a seated person and the sightline from the seat in front of them. A C-value of 60–125mm is considered good. Calculate row by row.

Row Depth (mm)

Riser Height (mm)

Number of Rows

Eye Height (seated, mm)

Focus Point Height (mm)

Distance to Focus Point (first row, mm)

C-value ≥ 60mm = good sight line. C-value 60–125mm optimal. Below 60mm = sight line issue.

Row	Floor Ht (mm)	Eye Ht (mm)	Distance (mm)	C-Value	Status