Scaffolding Calculator
Calculate scaffolding frames, planks, and braces needed for your project.
Enter building height and length to get a complete materials list.
Scaffolding quantity calculation ensures you rent or purchase enough scaffold frames, planks, braces, and base plates to safely cover the work area at the required height.
The Core Formula:
This assumes a single row of frames along one face, which is what you erect for siding, painting, or repointing.
Number of bays = Wall length / Bay width (7 ft, or 2.1 m)
Number of lifts = Wall height / Frame height (6.5 ft, or 2.0 m)
The one people get wrong: adjacent bays share an end frame, so a run of bays needs one more frame than you have bays, per lift.
Total frames = (Bays + 1) × Lifts
Total planks = Bays × Lifts × 3 (three planks deck one bay)
Standard Scaffold Components Per Bay:
| Component | Quantity per Bay |
|---|---|
| End frames | 1 (plus 1 to close the run) |
| Cross braces | 2 per lift |
| Planks | 3 per lift |
| Base plates | 2 per ground-level frame |
| Coupling pins | 2 per frame joint |
Worked Example:
Building facade: 42 ft long, 19.5 ft high.
- Bays: 42 / 7 = 6 bays
- Lifts: 19.5 / 6.5 = 3 lifts
- Frames: (6 + 1) × 3 = 21 frames
- Cross braces: 6 × 3 × 2 = 36 braces
- Planks: 6 × 3 × 3 = 54 planks
- Base plates: (6 + 1) × 2 = 14 base plates (one under each ground-level leg)
- Coupling pins: 7 × 2 joints × 2 legs = 28 pins
Safety Load Ratings:
| Scaffold Class | Max Load |
|---|---|
| Light duty | 1.2 kN/m² (~120 kg/m²) |
| Medium duty | 2.4 kN/m² (~240 kg/m²) |
| Heavy duty | 3.6 kN/m² (~360 kg/m²) |
Practical Tips:
- Always install guard rails above 2 m height — required by OSHA and equivalent codes worldwide
- Scaffold must be plumb within 1:100 vertical tolerance — use a spirit level when erecting
- Tie scaffold to the building every 4 m vertically and 6 m horizontally
- Never move scaffold with workers on it
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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