Directory 👈 Inch or Metric

Deck Calculator - Stumps, Bearers, Joists and Boards with Individual + Total Costs and Connections (fasteners)

Deck Material List and Cost Calculator Material List and Costs

Share this Calculation

Deck Length
Deck Width

Stump Width
Stump Height
Stump Centres
Stump Set In
Footing Diam:
Footing Depth

Board Width
Board Thick
Min Board Gap
Centres Adjusted to Fit Centres Adjusted to Fit Evenly
Bearer Thickness
Bearer Depth
Bearer Set In Inner
Bearer Set In Outer
Bearer Centres

Joist Thickness
Joist Depth
Joist Centres
End Joists Set In

Ground Fall in Width


Deck plan with full dimensions - Stumps, Bearers, Joists, Boards, Timber Costs

Enter Linear Costs

Correct Diagonal to Square Deck =

Total Deck Height   (Stump base to board top)

Deck Area =


STUMP Running set-out points along Deck ~ along Bearer (to near side of each stump)

Deck Stumps and Bearers diagram

STUMP Running set-out points across Deck ~ along Joist from Inside (to near side of each stump)

Fall in Width

Deck Stumps and Joists diagram


BEARER Running set-out points, across Deck ~ along Joist from inner side
(to near side of each bearer)

Deck Bearers diagram


JOIST Running set-out points along Bearer (to near side of each joist)

Deck Joists diagram

Deck Boards

      Mark Every Boards (Red).  

Tips for Laying Deck Boards Read this Forum Thread about Tips for Laying Deck Boards
See also: Deck and Floor Board Quantity and Spacing Calculator for more detailed floor board spacing and gap calculations.

BOARD Running set-out points.

Deck Joists and Boards diagram

Set Length Boards
Board Estimate Only Estimate only - Allows wastage calculated from board length and joist spacings only.

Enter Costs per Linear Metre and % waste to calculate Total Cost

Stumps + % Waste @ $ m
Bearers + % Waste @ $ m
Joists + % Waste @ $ m
Boards + % Waste @ $ m

Enter cost per linear metre and wastage % for Stumps, Bearers, Joists and Boards to Calculate individual and Total Costs. Linear metres and cost are auto updated when the deck is re-calculated, with individual costs for stumps, bearers and joists displayed in each section. Hit + and - buttons to open or close spacing, re-calculating the deck to find how different spacing options effect cost and materials.

Out of Square If your deck is slightly out of square (different widths), calculate results for both widths, and set out each end to suit. If necessary, adjust number of deck boards to match in both calculations, and see if different board gaps at each end of deck are acceptable, compared to equal gaps and cutting the last board at an angle. Use the widest dimensions for linear quantities.

DON'T BREATH THE DUST If you're cutting blocks, concrete, stone or ANYTHING and there's DUST - DON'T TAKE THE RISK
Don't cut it, or cut it wet so there's NO DUST - Silicosis Sucks

How should we spell it?


Blue Dragon Childrens Foundation If you've benefited from this free service please consider supporting Blue Dragon Children's Foundation

Please help promote this free service - Tell a Friend about this site!

Create PDF to print diagrams on this page. Help & Settings Printing Help (new window)

Copy all diagrams on this page to bottom of page - Make multiple copies to Print or Compare.

View page on Phone via QR Code (Not current calculation result)

Contact Us calculators

All calculators on this site are geometric only.
Check relevant local regulations for appropriate sizes, spacings and all engineering requirements.

Disclaimer   |   Privacy & Cookie Policy

Copyright © 2020 -
Zoom 100%

Fine tune Sliders

Printing Help

Help & Settings


↑ Remove Margins calculators

If you've benefited from this free service please consider supporting
Please help us support Blue Dragon Children's Foundation Built something using our calculators? Please Send Photos!