Practical calculator

Decking board calculator

Estimate decking boards using deck dimensions, board gaps and approximate cut planning.

Enter measurements

Measure in metres
Measure in metres
Length of one purchased board
Measure in millimetres
Follow manufacturer guidance
Waste and defects
Calculations run on your device. Measurements are not sent to our server.

Your result

Enter dimensions to see the result here.

How it works

Boards are assumed to run along the entered deck length. Rows are determined by board width and gaps; required pieces are fitted into stock lengths.

Before building

Framing, end supports, structural loads and fixings are not included.

How accurate is the result?

This calculator provides an estimate based on your inputs. Check actual measurements, product specifications and installation instructions before buying. Consult qualified professionals for structural safety.