Unitized Curtain Wall Calculator

Panel count and dimensions from building facade.

Facade width (m)

Number of stories

Floor-to-floor height (m)

Target panel width (m)

Seismic drift ratio

Tab to move between fields

Panels per floor

Total panels

800

Actual panel width (mm)1,500

Panel height (mm)3,900

Stack joint size (mm)29.3

Seismic drift (mm)19.5

Anchor brackets1,600

Panel weight (kg)351

Facade area (m²)4,680

Est. erection days80

Total Weight280,800

How to Use This Calculator

Enter the unit module width and height dimensions.
Set the design wind pressure and seismic drift requirement.
Input target U-factor and SHGC for energy performance.
Review the estimated factory unit cost, installation rate (units per day), and total system cost.
Use the thermal performance outputs for ASHRAE 90.1 compliance calculations.

How the result changes with Facade width (m)

Facade width (m): Total horizontal length of one facade elevation in metres.
Number of stories: Number of floors the curtain wall covers.
Floor-to-floor height (m): Slab-to-slab height; each unitized panel spans one floor.
Target panel width (m): Desired module width for each unitized panel. Typical 1.2–1.8 m.
Seismic drift ratio: Design inter-story drift ratio (e.g., 0.005 = H/200). Per ASCE 7 or local seismic code.

Panels per floor: Number of unitized panels required per floor level.
Total panels: Total unitized panels for the entire facade.
Actual panel width (mm): Panel width after evenly distributing across facade.
Panel height (mm): Panel height equals floor-to-floor dimension.
Stack joint size (mm): Minimum vertical stack joint to accommodate deflection, thermal, and seismic movement.
Seismic drift (mm): Expected inter-story drift movement at design earthquake.
Anchor brackets: Total anchor/tie-back brackets (2 per panel: dead-load + live-load).
Panel weight (kg): Estimated weight per panel including frame and glass (~60 kg/m²).
Facade area (m²): Total curtain wall facade area.
Est. erection days: Estimated installation duration at ~10 panels per crane-day.

Identify Input Parameters
4 parameters
Facade width (m) = 60, Number of stories = 20, Floor-to-floor height (m) = 3.9, Target panel width (m) = 1.5 = 5 input(s) provided
Calculate Panels per floor
Panels per floor = ceil(facadeWidth / panelWidth)
40 = 40
Calculate Total panels
Total panels = panelsPerFloor * stories
800 = 800
Calculate Actual panel width
Actual panel width = facadeWidth / panelsPerFloor
1500 = 1500
Calculate Panel height
3900 = 3900