Pergola Calculator
Calculate
Formula
Posts = 4-6 × (Height + 2 ft). Beams = 2 × (Length + 2 ft). Rafters = (Length ÷ 1.33 + 1) × (Width + 2 ft).
Frequently Asked Questions
How many posts does a pergola need?
A small pergola (10 ft or less) needs 4 corner posts. Longer pergolas benefit from 6 posts with intermediate supports.
What spacing for pergola rafters?
16 inches on center is standard rafter spacing, providing a good balance of shade and open sky.