Decking calculator
Decking calculator: how many boards do I need?
Use the decking calculator as a planning guide for board count, accessory quantities and delivery notes before final material confirmation.
Quick answer
Use the decking calculator as a planning guide for board count, accessory quantities and delivery notes before final material confirmation.
Simple board count method
Calculate finished area, divide by board coverage, then add a waste allowance. Keep lineal metre checks separate for borders, stairs and picture-frame edges.
- Measure finished deck length and width.
- Confirm board width and usable cover.
- Add waste allowance for cuts, joins and layout.
- Add clips, screws, fascia and freight notes.
Why estimates still need review
Deck design, joist spacing, board direction, stair detail and visible edges can change final quantities. Use estimates as planning support, not as an installation specification.
Common questions
FAQ
How many decking boards do I need?
Start with deck area and board cover, then add a waste allowance. The full calculator can turn those inputs into a planning estimate.
How many clips do I need for composite decking?
Clip count depends on board count, joist spacing and clip system. BuildBarn calculator defaults are planning assumptions and should be checked against the selected product.
Can I send the estimate for a quote?
Yes. Use the calculator output as a draft list, then add product preference, delivery suburb and site access notes for quote support.